diff --git a/.gitignore b/.gitignore
index e4f765a..195c87a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
-*/**/__pycache__
 *.pyc
+*.sqlite3
+__pycache__
diff --git a/Dockerfile b/Dockerfile
index d3a5c62..57e1414 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ RUN pip install poetry
 
 COPY ./pyproject.toml /app/pyproject.toml
 COPY ./poetry.lock /app/poetry.lock
-RUN poetry install --only main
+RUN poetry install --only main --only ui --only backend --all-extras
 
 COPY ./soul_diary /app/soul_diary
 
diff --git a/poetry.lock b/poetry.lock
index 6e629ae..b3788b7 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,5 +1,39 @@
 # This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
 
+[[package]]
+name = "aiosqlite"
+version = "0.19.0"
+description = "asyncio bridge to the standard sqlite3 module"
+optional = true
+python-versions = ">=3.7"
+files = [
+    {file = "aiosqlite-0.19.0-py3-none-any.whl", hash = "sha256:edba222e03453e094a3ce605db1b970c4b3376264e56f32e2a4959f948d66a96"},
+    {file = "aiosqlite-0.19.0.tar.gz", hash = "sha256:95ee77b91c8d2808bd08a59fbebf66270e9090c3d92ffbf260dc0db0b979577d"},
+]
+
+[package.extras]
+dev = ["aiounittest (==1.4.1)", "attribution (==1.6.2)", "black (==23.3.0)", "coverage[toml] (==7.2.3)", "flake8 (==5.0.4)", "flake8-bugbear (==23.3.12)", "flit (==3.7.1)", "mypy (==1.2.0)", "ufmt (==2.1.0)", "usort (==1.0.6)"]
+docs = ["sphinx (==6.1.3)", "sphinx-mdinclude (==0.5.3)"]
+
+[[package]]
+name = "alembic"
+version = "1.13.0"
+description = "A database migration tool for SQLAlchemy."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "alembic-1.13.0-py3-none-any.whl", hash = "sha256:a23974ea301c3ee52705db809c7413cecd165290c6679b9998dd6c74342ca23a"},
+    {file = "alembic-1.13.0.tar.gz", hash = "sha256:ab4b3b94d2e1e5f81e34be8a9b7b7575fc9dd5398fccb0bef351ec9b14872623"},
+]
+
+[package.dependencies]
+Mako = "*"
+SQLAlchemy = ">=1.3.0"
+typing-extensions = ">=4"
+
+[package.extras]
+tz = ["backports.zoneinfo"]
+
 [[package]]
 name = "annotated-types"
 version = "0.6.0"
@@ -50,6 +84,89 @@ types-python-dateutil = ">=2.8.10"
 doc = ["doc8", "sphinx (>=7.0.0)", "sphinx-autobuild", "sphinx-autodoc-typehints", "sphinx_rtd_theme (>=1.3.0)"]
 test = ["dateparser (==1.*)", "pre-commit", "pytest", "pytest-cov", "pytest-mock", "pytz (==2021.1)", "simplejson (==3.*)"]
 
+[[package]]
+name = "asyncpg"
+version = "0.28.0"
+description = "An asyncio PostgreSQL driver"
+optional = true
+python-versions = ">=3.7.0"
+files = [
+    {file = "asyncpg-0.28.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:0a6d1b954d2b296292ddff4e0060f494bb4270d87fb3655dd23c5c6096d16d83"},
+    {file = "asyncpg-0.28.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:0740f836985fd2bd73dca42c50c6074d1d61376e134d7ad3ad7566c4f79f8184"},
+    {file = "asyncpg-0.28.0-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:e907cf620a819fab1737f2dd90c0f185e2a796f139ac7de6aa3212a8af96c050"},
+    {file = "asyncpg-0.28.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:86b339984d55e8202e0c4b252e9573e26e5afa05617ed02252544f7b3e6de3e9"},
+    {file = "asyncpg-0.28.0-cp310-cp310-musllinux_1_1_aarch64.whl", hash = "sha256:0c402745185414e4c204a02daca3d22d732b37359db4d2e705172324e2d94e85"},
+    {file = "asyncpg-0.28.0-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:c88eef5e096296626e9688f00ab627231f709d0e7e3fb84bb4413dff81d996d7"},
+    {file = "asyncpg-0.28.0-cp310-cp310-win32.whl", hash = "sha256:90a7bae882a9e65a9e448fdad3e090c2609bb4637d2a9c90bfdcebbfc334bf89"},
+    {file = "asyncpg-0.28.0-cp310-cp310-win_amd64.whl", hash = "sha256:76aacdcd5e2e9999e83c8fbcb748208b60925cc714a578925adcb446d709016c"},
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+    {file = "asyncpg-0.28.0-cp38-cp38-win_amd64.whl", hash = "sha256:8ba7d06a0bea539e0487234511d4adf81dc8762249858ed2a580534e1720db00"},
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+    {file = "asyncpg-0.28.0-cp39-cp39-musllinux_1_1_aarch64.whl", hash = "sha256:5e18438a0730d1c0c1715016eacda6e9a505fc5aa931b37c97d928d44941b4bf"},
+    {file = "asyncpg-0.28.0-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:e9c433f6fcdd61c21a715ee9128a3ca48be8ac16fa07be69262f016bb0f4dbd2"},
+    {file = "asyncpg-0.28.0-cp39-cp39-win32.whl", hash = "sha256:41e97248d9076bc8e4849da9e33e051be7ba37cd507cbd51dfe4b2d99c70e3dc"},
+    {file = "asyncpg-0.28.0-cp39-cp39-win_amd64.whl", hash = "sha256:3ed77f00c6aacfe9d79e9eff9e21729ce92a4b38e80ea99a58ed382f42ebd55b"},
+    {file = "asyncpg-0.28.0.tar.gz", hash = "sha256:7252cdc3acb2f52feaa3664280d3bcd78a46bd6c10bfd681acfffefa1120e278"},
+]
+
+[package.extras]
+docs = ["Sphinx (>=5.3.0,<5.4.0)", "sphinx-rtd-theme (>=1.2.2)", "sphinxcontrib-asyncio (>=0.3.0,<0.4.0)"]
+test = ["flake8 (>=5.0,<6.0)", "uvloop (>=0.15.3)"]
+
+[[package]]
+name = "bcrypt"
+version = "4.1.1"
+description = "Modern password hashing for your software and your servers"
+optional = false
+python-versions = ">=3.7"
+files = [
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+    {file = "bcrypt-4.1.1-pp310-pypy310_pp73-manylinux_2_28_x86_64.whl", hash = "sha256:476aa8e8aca554260159d4c7a97d6be529c8e177dbc1d443cb6b471e24e82c74"},
+    {file = "bcrypt-4.1.1-pp39-pypy39_pp73-manylinux_2_28_aarch64.whl", hash = "sha256:12611c4b0a8b1c461646228344784a1089bc0c49975680a2f54f516e71e9b79e"},
+    {file = "bcrypt-4.1.1-pp39-pypy39_pp73-manylinux_2_28_x86_64.whl", hash = "sha256:c6450538a0fc32fb7ce4c6d511448c54c4ff7640b2ed81badf9898dcb9e5b737"},
+    {file = "bcrypt-4.1.1.tar.gz", hash = "sha256:df37f5418d4f1cdcff845f60e747a015389fa4e63703c918330865e06ad80007"},
+]
+
+[package.extras]
+tests = ["pytest (>=3.2.1,!=3.3.0)"]
+typecheck = ["mypy"]
+
 [[package]]
 name = "binaryornot"
 version = "0.4.4"
@@ -353,6 +470,77 @@ flet-core = "0.14.0"
 httpx = ">=0.24.1,<0.25.0"
 oauthlib = ">=3.2.2,<4.0.0"
 
+[[package]]
+name = "greenlet"
+version = "3.0.2"
+description = "Lightweight in-process concurrent programming"
+optional = false
+python-versions = ">=3.7"
+files = [
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+    {file = "greenlet-3.0.2-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:339c0272a62fac7e602e4e6ec32a64ff9abadc638b72f17f6713556ed011d493"},
+    {file = "greenlet-3.0.2-cp310-cp310-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:38878744926cec29b5cc3654ef47f3003f14bfbba7230e3c8492393fe29cc28b"},
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+test = ["objgraph", "psutil"]
+
 [[package]]
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 version = "0.14.0"
@@ -436,6 +624,25 @@ MarkupSafe = ">=2.0"
 [package.extras]
 i18n = ["Babel (>=2.7)"]
 
+[[package]]
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+description = "A super-fast templating language that borrows the best ideas from the existing templating languages."
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+babel = ["Babel"]
+lingua = ["lingua"]
+testing = ["pytest"]
+
 [[package]]
 name = "markdown-it-py"
 version = "3.0.0"
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 [[package]]
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 version = "0.27.0"
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+    {file = "yarl-1.9.4.tar.gz", hash = "sha256:566db86717cf8080b99b58b083b773a908ae40f06681e87e589a976faf8246bf"},
+]
+
+[package.dependencies]
+idna = ">=2.0"
+multidict = ">=4.0"
+
+[extras]
+postgres = ["asyncpg"]
+sqlite = ["aiosqlite"]
+
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "10427d6e72deac4ef97a9541f0be6c56cf626d1547ba12258fc3af5e4087e728"
+content-hash = "2edc77f8a1e7fc20a3330be55ee660506982acfa0ace143d3b5fc41c3b813e5d"
diff --git a/pyproject.toml b/pyproject.toml
index 2e97f18..974c0dc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,17 +9,35 @@ include = [
 ]
 
 [tool.poetry.dependencies]
+# extras
+aiosqlite = { version = "^0.19.0", optional = true }
+asyncpg = { version = "^0.28.0", optional = true }
+
+# main
 python = "^3.11"
-flet = "^0.14.0"
-flet-fastapi = "^0.14.0"
 uvicorn = "^0.24.0.post1"
 facet = "^0.9.1"
-flet-route = "^0.3.2"
 pydantic = "^2.5.2"
-fastapi = "0.101.1"
 typer = "^0.9.0"
 pydantic-settings = "^2.1.0"
+
+[tool.poetry.extras]
+sqlite = ["aiosqlite"]
+postgres = ["asyncpg"]
+
+[tool.poetry.group.backend.dependencies]
+fastapi = "0.101.1"
+sqlalchemy = "^2.0.23"
+alembic = "^1.13.0"
+bcrypt = "^4.1.1"
+
+[tool.poetry.group.ui.dependencies]
+flet = "^0.14.0"
+flet-route = "^0.3.2"
+flet-fastapi = "^0.14.0"
 pycryptodomex = "^3.19.0"
+yarl = "^1.9.4"
+httpx = "0.24.1"
 
 [build-system]
 requires = ["poetry-core"]
diff --git a/soul_diary/api/__init__.py b/soul_diary/api/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/soul_diary/backend/__init__.py b/soul_diary/backend/__init__.py
new file mode 100644
index 0000000..e482d45
--- /dev/null
+++ b/soul_diary/backend/__init__.py
@@ -0,0 +1,2 @@
+from .cli import get_cli
+from .service import BackendService, get_service
diff --git a/soul_diary/backend/__main__.py b/soul_diary/backend/__main__.py
new file mode 100644
index 0000000..c148b10
--- /dev/null
+++ b/soul_diary/backend/__main__.py
@@ -0,0 +1,7 @@
+from .cli import get_cli
+
+
+if __name__ == "__main__":
+    cli = get_cli()
+
+    cli()
diff --git a/soul_diary/backend/api/__init__.py b/soul_diary/backend/api/__init__.py
new file mode 100644
index 0000000..f065755
--- /dev/null
+++ b/soul_diary/backend/api/__init__.py
@@ -0,0 +1,2 @@
+from .cli import get_cli
+from .service import APIService, get_service
diff --git a/soul_diary/backend/api/cli.py b/soul_diary/backend/api/cli.py
new file mode 100644
index 0000000..90a3955
--- /dev/null
+++ b/soul_diary/backend/api/cli.py
@@ -0,0 +1,13 @@
+import typer
+
+
+def run():
+    pass
+
+
+def get_cli() -> typer.Typer:
+    cli = typer.Typer()
+
+    cli.command(name="run")(run)
+
+    return cli
diff --git a/soul_diary/backend/api/dependencies.py b/soul_diary/backend/api/dependencies.py
new file mode 100644
index 0000000..a8a2c59
--- /dev/null
+++ b/soul_diary/backend/api/dependencies.py
@@ -0,0 +1,31 @@
+import fastapi
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
+
+from soul_diary.backend.api.exceptions import HTTPNotAuthenticated
+from soul_diary.backend.api.settings import APISettings
+from soul_diary.backend.database import DatabaseService
+from soul_diary.backend.database.models import Session
+
+
+async def database(request: fastapi.Request) -> DatabaseService:
+    return request.app.service.database
+
+
+async def settings(request: fastapi.Request) -> APISettings:
+    return request.app.service.settings
+
+
+async def is_auth(
+        database: DatabaseService = fastapi.Depends(database),
+        credentials: HTTPAuthorizationCredentials = fastapi.Depends(HTTPBearer()),
+) -> Session:
+    async with database.transaction() as session:
+        user_session = await database.get_user_session(
+            session=session,
+            token=credentials.credentials,
+        )
+
+    if user_session is None:
+        raise HTTPNotAuthenticated()
+
+    return user_session
diff --git a/soul_diary/backend/api/exceptions.py b/soul_diary/backend/api/exceptions.py
new file mode 100644
index 0000000..d179c8b
--- /dev/null
+++ b/soul_diary/backend/api/exceptions.py
@@ -0,0 +1,41 @@
+import fastapi
+
+
+class HTTPRegistrationNotSupported(fastapi.HTTPException):
+    def __init__(self):
+        super().__init__(
+            status_code=fastapi.status.HTTP_400_BAD_REQUEST,
+            detail="Registration not supported.",
+        )
+
+
+class HTTPUserAlreadyExists(fastapi.HTTPException):
+    def __init__(self):
+        super().__init__(
+            status_code=fastapi.status.HTTP_400_BAD_REQUEST,
+            detail="User already exists.",
+        )
+
+
+class HTTPNotAuthenticated(fastapi.HTTPException):
+    def __init__(self):
+        super().__init__(
+            status_code=fastapi.status.HTTP_401_UNAUTHORIZED,
+            detail="Not authenticated.",
+        )
+
+
+class HTTPForbidden(fastapi.HTTPException):
+    def __init__(self):
+        super().__init__(
+            status_code=fastapi.status.HTTP_403_FORBIDDEN,
+            detail="Forbidden.",
+        )
+
+
+class HTTPNotFound(fastapi.HTTPException):
+    def __init__(self):
+        super().__init__(
+            status_code=fastapi.status.HTTP_404_NOT_FOUND,
+            detail="Not found.",
+        )
diff --git a/soul_diary/backend/api/handlers.py b/soul_diary/backend/api/handlers.py
new file mode 100644
index 0000000..c873a80
--- /dev/null
+++ b/soul_diary/backend/api/handlers.py
@@ -0,0 +1,63 @@
+import fastapi
+from sqlalchemy.exc import IntegrityError
+
+from soul_diary.backend.api.settings import APISettings
+from soul_diary.backend.api.dependencies import database, is_auth, settings
+from soul_diary.backend.database import DatabaseService
+from soul_diary.backend.database.models import Session
+from .exceptions import (
+    HTTPNotAuthenticated,
+    HTTPRegistrationNotSupported,
+    HTTPUserAlreadyExists,
+)
+from .schemas import CredentialsRequest, OptionsResponse, TokenResponse
+
+
+async def options(settings: APISettings = fastapi.Depends(settings)) -> OptionsResponse:
+    return OptionsResponse(registration_enabled=settings.registration_enabled)
+
+
+async def sign_up(
+        data: CredentialsRequest = fastapi.Body(...),
+        settings: APISettings = fastapi.Depends(settings),
+        database: DatabaseService = fastapi.Depends(database),
+) -> TokenResponse:
+    if not settings.registration_enabled:
+        raise HTTPRegistrationNotSupported()
+
+    try:
+        async with database.transaction() as session:
+            user = await database.create_user(
+                session=session,
+                username=data.username,
+                password=data.password,
+            )
+    except IntegrityError:
+        raise HTTPUserAlreadyExists()
+    user_session = user.sessions[0]
+
+    return TokenResponse(token=user_session.token)
+
+
+async def sign_in(
+        data: CredentialsRequest = fastapi.Body(...),
+        database: DatabaseService = fastapi.Depends(database),
+) -> TokenResponse:
+    async with database.transaction() as session:
+        user_session = await database.auth_user(
+            session=session,
+            username=data.username,
+            password=data.password,
+        )
+    if user_session is None:
+        raise HTTPNotAuthenticated()
+
+    return TokenResponse(token=user_session.token)
+
+
+async def logout(
+        database: DatabaseService = fastapi.Depends(database),
+        user_session: Session = fastapi.Depends(is_auth),
+):
+    async with database.transaction() as session:
+        await database.logout_user(session=session, user_session=user_session)
diff --git a/soul_diary/backend/api/router.py b/soul_diary/backend/api/router.py
new file mode 100644
index 0000000..3276ff2
--- /dev/null
+++ b/soul_diary/backend/api/router.py
@@ -0,0 +1,15 @@
+import fastapi
+
+from . import handlers, senses
+from .dependencies import database
+
+
+router = fastapi.APIRouter(
+    dependencies=[fastapi.Depends(database)],
+)
+
+router.add_api_route(path="/signup", methods=["POST"], endpoint=handlers.sign_up)
+router.add_api_route(path="/signin", methods=["POST"], endpoint=handlers.sign_in)
+router.add_api_route(path="/logout", methods=["POST"], endpoint=handlers.logout)
+router.add_api_route(path="/options", methods=["GET"], endpoint=handlers.options)
+router.include_router(senses.router, prefix="/senses", tags=["Senses"])
diff --git a/soul_diary/backend/api/schemas.py b/soul_diary/backend/api/schemas.py
new file mode 100644
index 0000000..d4ca143
--- /dev/null
+++ b/soul_diary/backend/api/schemas.py
@@ -0,0 +1,14 @@
+from pydantic import BaseModel, constr
+
+
+class CredentialsRequest(BaseModel):
+    username: constr(min_length=4, max_length=64, strip_whitespace=True)
+    password: constr(min_length=8, max_length=64)
+
+
+class TokenResponse(BaseModel):
+    token: constr(min_length=32, max_length=32)
+
+
+class OptionsResponse(BaseModel):
+    registration_enabled: bool
diff --git a/soul_diary/backend/api/senses/__init__.py b/soul_diary/backend/api/senses/__init__.py
new file mode 100644
index 0000000..2378043
--- /dev/null
+++ b/soul_diary/backend/api/senses/__init__.py
@@ -0,0 +1 @@
+from .router import router
diff --git a/soul_diary/backend/api/senses/dependencies.py b/soul_diary/backend/api/senses/dependencies.py
new file mode 100644
index 0000000..e4e140f
--- /dev/null
+++ b/soul_diary/backend/api/senses/dependencies.py
@@ -0,0 +1,24 @@
+import uuid
+
+import fastapi
+
+from soul_diary.backend.api.dependencies import database, is_auth
+from soul_diary.backend.api.exceptions import HTTPForbidden, HTTPNotFound
+from soul_diary.backend.database import DatabaseService
+from soul_diary.backend.database.models import Sense, Session
+
+
+async def sense(
+        database: DatabaseService = fastapi.Depends(database),
+        user_session: Session = fastapi.Depends(is_auth),
+        sense_id: uuid.UUID = fastapi.Path(),
+) -> Sense:
+    async with database.transaction() as session:
+        sense = await database.get_sense(session=session, sense_id=sense_id)
+    
+    if sense is None:
+        raise HTTPNotFound()
+    if sense.user_id != user_session.user_id:
+        raise HTTPForbidden()
+
+    return sense
diff --git a/soul_diary/backend/api/senses/handlers.py b/soul_diary/backend/api/senses/handlers.py
new file mode 100644
index 0000000..42916a7
--- /dev/null
+++ b/soul_diary/backend/api/senses/handlers.py
@@ -0,0 +1,71 @@
+import fastapi
+
+from soul_diary.backend.api.dependencies import database
+from soul_diary.backend.database import DatabaseService
+from soul_diary.backend.database.models import Sense, Session
+from .dependencies import is_auth, sense
+from .schemas import (
+    CreateSenseRequest,
+    Pagination,
+    SenseListResponse,
+    SenseResponse,
+    UpdateSenseRequest,
+)
+
+
+async def get_sense_list(
+        database: DatabaseService = fastapi.Depends(database),
+        user_session: Session = fastapi.Depends(is_auth),
+        pagination: Pagination = fastapi.Depends(Pagination),
+) -> SenseListResponse:
+    async with database.transaction() as session:
+        senses = await database.get_sense_list(
+            session=session,
+            user=user_session.user,
+            page=pagination.page,
+            limit=pagination.limit,
+        )
+
+    return SenseListResponse(data=senses)
+
+
+async def create_sense(
+        database: DatabaseService = fastapi.Depends(database),
+        user_session: Session = fastapi.Depends(is_auth),
+        data: CreateSenseRequest = fastapi.Body(),
+) -> SenseResponse:
+    async with database.transaction() as session:
+        sense = await database.create_sense(
+            session=session,
+            user=user_session.user,
+            data=data.data,
+        )
+
+    return SenseResponse.model_validate(sense)
+
+
+async def get_sense(sense: Sense = fastapi.Depends(sense)) -> SenseResponse:
+    return SenseResponse.model_validate(sense)
+
+
+async def update_sense(
+        database: DatabaseService = fastapi.Depends(database),
+        sense: Sense = fastapi.Depends(sense),
+        data: UpdateSenseRequest = fastapi.Body(),
+) -> SenseResponse:
+    async with database.transaction() as session:
+        sense = await database.update_sense(
+            session=session,
+            sense=sense,
+            data=data.data,
+        )
+
+    return SenseResponse.model_validate(sense)
+
+
+async def delete_sense(
+        database: DatabaseService = fastapi.Depends(database),
+        sense: Sense = fastapi.Depends(sense),
+):
+    async with database.transaction() as session:
+        await database.delete_sense(session=session, sense=sense)
diff --git a/soul_diary/backend/api/senses/router.py b/soul_diary/backend/api/senses/router.py
new file mode 100644
index 0000000..105397f
--- /dev/null
+++ b/soul_diary/backend/api/senses/router.py
@@ -0,0 +1,11 @@
+import fastapi
+
+from . import handlers
+
+router = fastapi.APIRouter()
+
+router.add_api_route(path="/", methods=["GET"], endpoint=handlers.get_sense_list)
+router.add_api_route(path="/", methods=["POST"], endpoint=handlers.create_sense)
+router.add_api_route(path="/{sense_id}", methods=["GET"], endpoint=handlers.get_sense)
+router.add_api_route(path="/{sense_id}", methods=["POST"], endpoint=handlers.update_sense)
+router.add_api_route(path="/{sense_id}", methods=["DELETE"], endpoint=handlers.delete_sense)
diff --git a/soul_diary/backend/api/senses/schemas.py b/soul_diary/backend/api/senses/schemas.py
new file mode 100644
index 0000000..d818612
--- /dev/null
+++ b/soul_diary/backend/api/senses/schemas.py
@@ -0,0 +1,29 @@
+import uuid
+from datetime import datetime
+
+from pydantic import AwareDatetime, BaseModel, ConfigDict, PositiveInt
+
+
+class CreateSenseRequest(BaseModel):
+    data: str
+
+
+class UpdateSenseRequest(BaseModel):
+    data: str
+
+
+class SenseResponse(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: uuid.UUID
+    data: str
+    created_at: datetime
+
+
+class Pagination(BaseModel):
+    page: PositiveInt = 1
+    limit: PositiveInt = 10
+
+
+class SenseListResponse(BaseModel):
+    data: list[SenseResponse]
diff --git a/soul_diary/backend/api/service.py b/soul_diary/backend/api/service.py
new file mode 100644
index 0000000..6162a49
--- /dev/null
+++ b/soul_diary/backend/api/service.py
@@ -0,0 +1,62 @@
+import fastapi
+import uvicorn
+from facet import ServiceMixin
+from fastapi.middleware.cors import CORSMiddleware
+
+from soul_diary.backend.database import DatabaseService, get_service as get_database_service
+from . import router
+from .settings import APISettings
+
+
+class UvicornServer(uvicorn.Server):
+    def install_signal_handlers(self):
+        pass
+
+
+class APIService(ServiceMixin):
+    def __init__(self, database: DatabaseService, settings: APISettings, port: int = 8001):
+        self._database = database
+        self._settings = settings
+
+        self._port = port
+
+    @property
+    def database(self) -> DatabaseService:
+        return self._database
+
+    @property
+    def settings(self) -> APISettings:
+        return self._settings
+
+    def get_app(self) -> fastapi.FastAPI:
+        app = fastapi.FastAPI()
+        app.add_middleware(
+            CORSMiddleware,
+            allow_origins=["*"],
+            allow_credentials=True,
+            allow_methods=["*"],
+            allow_headers=["*"],
+        )
+        app.service = self
+        self.setup_app(app=app)
+
+        return app
+
+    def setup_app(self, app: fastapi.FastAPI):
+        app.include_router(router.router)
+
+    async def start(self):
+        config = uvicorn.Config(app=self.get_app(), host="0.0.0.0", port=self._port)
+        server = UvicornServer(config)
+
+        self.add_task(server.serve())
+
+
+def get_service() -> APIService:
+    database_service = get_database_service()
+    settings = APISettings()
+    return APIService(
+        database=database_service,
+        settings=settings,
+        port=settings.port,
+    ) 
diff --git a/soul_diary/backend/api/settings.py b/soul_diary/backend/api/settings.py
new file mode 100644
index 0000000..bdc0ce8
--- /dev/null
+++ b/soul_diary/backend/api/settings.py
@@ -0,0 +1,10 @@
+from pydantic import conint
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class APISettings(BaseSettings):
+    model_config = SettingsConfigDict(prefix="backend_api_")
+
+    port: conint(ge=1, le=65535) = 8001
+
+    registration_enabled: bool = True
diff --git a/soul_diary/backend/cli.py b/soul_diary/backend/cli.py
new file mode 100644
index 0000000..17daf60
--- /dev/null
+++ b/soul_diary/backend/cli.py
@@ -0,0 +1,22 @@
+import asyncio
+
+import typer
+
+from . import api, database
+from .service import get_service
+
+
+def run():
+    backend_service = get_service()
+
+    asyncio.run(backend_service.run())
+
+
+def get_cli() -> typer.Typer:
+    cli = typer.Typer()
+
+    cli.add_typer(api.get_cli(), name="api")
+    cli.add_typer(database.get_cli(), name="database")
+    cli.command(name="run")(run)
+
+    return cli
diff --git a/soul_diary/backend/database/__init__.py b/soul_diary/backend/database/__init__.py
new file mode 100644
index 0000000..f0e05d0
--- /dev/null
+++ b/soul_diary/backend/database/__init__.py
@@ -0,0 +1,2 @@
+from .cli import get_cli
+from .service import DatabaseService, get_service
diff --git a/soul_diary/backend/database/cli.py b/soul_diary/backend/database/cli.py
new file mode 100644
index 0000000..5b9322a
--- /dev/null
+++ b/soul_diary/backend/database/cli.py
@@ -0,0 +1,67 @@
+from typing import Optional
+
+import typer
+
+from .service import DatabaseService, get_service
+
+
+def migrations_list(ctx: typer.Context):
+    database_service: DatabaseService = ctx.obj["database"]
+
+    database_service.show_migrations()
+
+
+def migrations_apply(ctx: typer.Context):
+    database_service: DatabaseService = ctx.obj["database"]
+
+    database_service.migrate()
+
+
+def migrations_rollback(
+    ctx: typer.Context,
+    revision: Optional[str] = typer.Argument(
+        None,
+        help="Revision id or relative revision (`-1`, `-2`)",
+    ),
+):
+    database_service: DatabaseService = ctx.obj["database"]
+
+    database_service.rollback(revision=revision)
+
+
+def migrations_create(
+        ctx: typer.Context,
+        message: Optional[str] = typer.Option(
+            None,
+            "-m", "--message",
+            help="Migration short message",
+        ),
+):
+    database_service: DatabaseService = ctx.obj["database"]
+
+    database_service.create_migration(message=message)
+
+
+def get_migrations_cli() -> typer.Typer:
+    cli = typer.Typer(name="Migration")
+
+    cli.command(name="apply")(migrations_apply)
+    cli.command(name="rollback")(migrations_rollback)
+    cli.command(name="create")(migrations_create)
+    cli.command(name="list")(migrations_list)
+
+    return cli
+
+
+def service_callback(ctx: typer.Context):
+    ctx.obj = ctx.obj or {}
+    ctx.obj["database"] = get_service()
+
+
+def get_cli() -> typer.Typer:
+    cli = typer.Typer()
+
+    cli.callback()(service_callback)
+    cli.add_typer(get_migrations_cli(), name="migrations")
+
+    return cli
diff --git a/soul_diary/backend/database/migrations/env.py b/soul_diary/backend/database/migrations/env.py
new file mode 100644
index 0000000..19b550d
--- /dev/null
+++ b/soul_diary/backend/database/migrations/env.py
@@ -0,0 +1,91 @@
+import asyncio
+from logging.config import fileConfig
+
+from sqlalchemy import pool
+from sqlalchemy.engine import Connection
+from sqlalchemy.ext.asyncio import async_engine_from_config
+
+from alembic import context
+
+from soul_diary.backend.database import models
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+target_metadata = models.Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection: Connection) -> None:
+    context.configure(connection=connection, target_metadata=target_metadata)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_async_migrations() -> None:
+    """In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    connectable = async_engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+
+    await connectable.dispose()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode."""
+
+    asyncio.run(run_async_migrations())
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
diff --git a/soul_diary/backend/database/migrations/script.py.mako b/soul_diary/backend/database/migrations/script.py.mako
new file mode 100644
index 0000000..fbc4b07
--- /dev/null
+++ b/soul_diary/backend/database/migrations/script.py.mako
@@ -0,0 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}
diff --git a/soul_diary/backend/database/migrations/versions/bce1e66bb101_init.py b/soul_diary/backend/database/migrations/versions/bce1e66bb101_init.py
new file mode 100644
index 0000000..3d9153b
--- /dev/null
+++ b/soul_diary/backend/database/migrations/versions/bce1e66bb101_init.py
@@ -0,0 +1,66 @@
+"""init
+
+Revision ID: bce1e66bb101
+Revises: 
+Create Date: 2023-12-14 10:47:06.594959
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'bce1e66bb101'
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('users',
+    sa.Column('id', sa.Uuid(), nullable=False),
+    sa.Column('username', sa.String(length=64), nullable=False),
+    sa.Column('password', sa.String(length=72), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('username')
+    )
+    op.create_index('users__id_idx', 'users', ['id'], unique=False, postgresql_using='hash')
+    op.create_index('users__username_idx', 'users', ['username'], unique=False, postgresql_using='hash')
+    op.create_table('senses',
+    sa.Column('id', sa.Uuid(), nullable=False),
+    sa.Column('user_id', sa.Uuid(), nullable=False),
+    sa.Column('data', sa.String(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index('senses__created_at_idx', 'senses', ['created_at'], unique=False, postgresql_using='btree')
+    op.create_index('senses__id_idx', 'senses', ['id'], unique=False, postgresql_using='hash')
+    op.create_index('senses__user_id_idx', 'senses', ['user_id'], unique=False, postgresql_using='btree')
+    op.create_table('sessions',
+    sa.Column('token', sa.String(), nullable=False),
+    sa.Column('user_id', sa.Uuid(), nullable=False),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+    sa.PrimaryKeyConstraint('token')
+    )
+    op.create_index('sessions__token_idx', 'sessions', ['token'], unique=False, postgresql_using='hash')
+    op.create_index('sessions__user_id_idx', 'sessions', ['user_id'], unique=False, postgresql_using='btree')
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index('sessions__user_id_idx', table_name='sessions', postgresql_using='btree')
+    op.drop_index('sessions__token_idx', table_name='sessions', postgresql_using='hash')
+    op.drop_table('sessions')
+    op.drop_index('senses__user_id_idx', table_name='senses', postgresql_using='btree')
+    op.drop_index('senses__id_idx', table_name='senses', postgresql_using='hash')
+    op.drop_index('senses__created_at_idx', table_name='senses', postgresql_using='btree')
+    op.drop_table('senses')
+    op.drop_index('users__username_idx', table_name='users', postgresql_using='hash')
+    op.drop_index('users__id_idx', table_name='users', postgresql_using='hash')
+    op.drop_table('users')
+    # ### end Alembic commands ###
diff --git a/soul_diary/backend/database/models.py b/soul_diary/backend/database/models.py
new file mode 100644
index 0000000..b5c03d7
--- /dev/null
+++ b/soul_diary/backend/database/models.py
@@ -0,0 +1,61 @@
+import random
+import string
+import uuid
+from datetime import datetime
+
+from sqlalchemy import ForeignKey, Index, String
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id: Mapped[uuid.UUID] = mapped_column(default=uuid.uuid4, primary_key=True)
+    username: Mapped[str] = mapped_column(String(64), unique=True)
+    password: Mapped[str] = mapped_column(String(72))
+
+    senses: Mapped[list["Sense"]] = relationship(back_populates="user")
+    sessions: Mapped[list["Session"]] = relationship(back_populates="user")
+
+    __table_args__ = (
+        Index("users__id_idx", "id", postgresql_using="hash"),
+        Index("users__username_idx", "username", postgresql_using="hash"),
+    )
+
+
+class Session(Base):
+    __tablename__ = "sessions"
+
+    token: Mapped[str] = mapped_column(
+        primary_key=True,
+        default=lambda: "".join(random.choice(string.hexdigits) for _ in range(32)),
+    )
+    user_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("users.id"))
+
+    user: Mapped[User] = relationship(back_populates="sessions", lazy=False)
+
+    __table_args__ = (
+        Index("sessions__token_idx", "token", postgresql_using="hash"),
+        Index("sessions__user_id_idx", "user_id", postgresql_using="btree"),
+    )
+
+
+class Sense(Base):
+    __tablename__ = "senses"
+
+    id: Mapped[uuid.UUID] = mapped_column(default=uuid.uuid4, primary_key=True)
+    user_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("users.id"))
+    data: Mapped[str]
+    created_at: Mapped[datetime] = mapped_column(default=datetime.utcnow)
+
+    user: Mapped[User] = relationship(back_populates="senses", lazy=False)
+
+    __table_args__ = (
+        Index("senses__id_idx", "id", postgresql_using="hash"),
+        Index("senses__user_id_idx", "user_id", postgresql_using="btree"),
+        Index("senses__created_at_idx", "created_at", postgresql_using="btree"),
+    )
diff --git a/soul_diary/backend/database/service.py b/soul_diary/backend/database/service.py
new file mode 100644
index 0000000..13cb44d
--- /dev/null
+++ b/soul_diary/backend/database/service.py
@@ -0,0 +1,144 @@
+import pathlib
+import uuid
+from contextlib import asynccontextmanager
+from typing import Type
+
+import bcrypt
+from alembic import command as alembic_command
+from alembic.config import Config as AlembicConfig
+from facet import ServiceMixin
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.orm import DeclarativeBase
+
+from .models import Sense, Session, User
+from .settings import DatabaseSettings
+
+
+class DatabaseService(ServiceMixin):
+    def __init__(self, dsn: str):
+        self._dsn = dsn
+        self._engine = create_async_engine(self._dsn, pool_recycle=60)
+        self._sessionmaker = async_sessionmaker(self._engine, expire_on_commit=False)
+
+    def get_alembic_config(self) -> AlembicConfig:
+        migrations_path = pathlib.Path(__file__).parent / "migrations"
+
+        config = AlembicConfig()
+        config.set_main_option("script_location", str(migrations_path))
+        config.set_main_option("sqlalchemy.url", self._dsn.replace("%", "%%"))
+
+        return config
+
+    def get_models(self) -> list[Type[DeclarativeBase]]:
+        return [User, Sense]
+
+    @asynccontextmanager
+    async def transaction(self):
+        async with self._sessionmaker() as session:
+            async with session.begin():
+                yield session
+
+    def migrate(self):
+        alembic_command.upgrade(self.get_alembic_config(), "head")
+
+    def rollback(self, revision: str | None = None):
+        revision = revision or "-1"
+
+        alembic_command.downgrade(self.get_alembic_config(), revision)
+
+    def show_migrations(self):
+        alembic_command.history(self.get_alembic_config())
+
+    def create_migration(self, message: str | None = None):
+        alembic_command.revision(
+            self.get_alembic_config(), message=message, autogenerate=True,
+        )
+
+    async def create_user(self, session: AsyncSession, username: str, password: str) -> User:
+        hashed_password = bcrypt.hashpw(
+            password.encode("utf-8"),
+            bcrypt.gensalt(),
+        ).decode("utf-8")
+        user = User(username=username, password=hashed_password)
+        user_session = Session(user=user)
+        user.sessions.append(user_session)
+
+        session.add_all([user, user_session])
+
+        return user
+
+    async def auth_user(
+            self,
+            session: AsyncSession,
+            username: str,
+            password: str,
+    ) -> Session | None:
+        query = select(User).where(User.username == username)
+
+        result = await session.execute(query)
+        user = result.scalar_one_or_none()
+        if user is None:
+            return None
+        if not bcrypt.checkpw(password.encode("utf-8"), user.password.encode("utf-8")):
+            return None
+
+        user_session = Session(user=user)
+        session.add(user_session)
+
+        return user_session
+
+    async def logout_user(self, session: AsyncSession, user_session: Session):
+        await session.delete(user_session)
+
+    async def get_user_session(self, session: AsyncSession, token: str) -> Session | None:
+        query = select(Session).where(Session.token == token)
+
+        result = await session.execute(query)
+        user_session = result.scalar_one_or_none()
+
+        return user_session
+
+    async def get_sense_list(
+            self,
+            session: AsyncSession,
+            user: User,
+            page: int = 1,
+            limit: int = 10,
+    ) -> list[Sense]:
+        query = select(Sense).where(Sense.user == user).limit(limit).offset((page - 1) * limit)
+
+        result = await session.execute(query)
+        senses = result.scalars().all()
+
+        return list(senses)
+
+    async def create_sense(self, session: AsyncSession, user: User, data: str) -> Sense:
+        sense = Sense(user=user, data=data)
+
+        session.add(sense)
+
+        return sense
+
+    async def get_sense(self, session: AsyncSession, sense_id: uuid.UUID) -> Sense | None:
+        query = select(Sense).where(Sense.id == sense_id)
+
+        result = await session.execute(query)
+        sense = result.scalar_one_or_none()
+
+        return sense
+
+    async def update_sense(self, session: AsyncSession, sense: Sense, data: str) -> Sense:
+        sense.data = data
+
+        session.add(sense)
+        
+        return sense
+
+    async def delete_sense(self, session: AsyncSession, sense: Sense):
+        await session.delete(sense)
+
+
+def get_service() -> DatabaseService:
+    settings = DatabaseSettings()
+    return DatabaseService(dsn=str(settings.dsn))
diff --git a/soul_diary/backend/database/settings.py b/soul_diary/backend/database/settings.py
new file mode 100644
index 0000000..f6391d8
--- /dev/null
+++ b/soul_diary/backend/database/settings.py
@@ -0,0 +1,8 @@
+from pydantic import AnyUrl
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class DatabaseSettings(BaseSettings):
+    model_config = SettingsConfigDict(prefix="backend_database_")
+
+    dsn: AnyUrl = "sqlite+aiosqlite:///soul_diary.sqlite3"
diff --git a/soul_diary/backend/service.py b/soul_diary/backend/service.py
new file mode 100644
index 0000000..8f557d5
--- /dev/null
+++ b/soul_diary/backend/service.py
@@ -0,0 +1,19 @@
+from facet import ServiceMixin
+
+from .api import APIService, get_service as get_api_service
+
+
+class BackendService(ServiceMixin):
+    def __init__(self, api: APIService):
+        self._api = api
+
+    @property
+    def dependencies(self) -> list[ServiceMixin]:
+        return [
+            self._api,
+        ]
+
+
+def get_service() -> BackendService:
+    api_service = get_api_service()
+    return BackendService(api=api_service)
diff --git a/soul_diary/cli.py b/soul_diary/cli.py
index fea7210..6e7923f 100644
--- a/soul_diary/cli.py
+++ b/soul_diary/cli.py
@@ -2,18 +2,20 @@ import asyncio
 
 import typer
 
-from . import ui
+from . import backend, ui
+from .service import get_service
 
 
 def run():
-    ui_service = ui.get_service()    
+    soul_diary_service = get_service()
 
-    asyncio.run(ui_service.run())
+    asyncio.run(soul_diary_service.run())
 
 
 def get_cli() -> typer.Typer:
     cli = typer.Typer()
 
+    cli.add_typer(backend.get_cli(), name="backend")
     cli.add_typer(ui.get_cli(), name="ui")
     cli.command(name="run")(run)
 
diff --git a/soul_diary/service.py b/soul_diary/service.py
new file mode 100644
index 0000000..5c5078e
--- /dev/null
+++ b/soul_diary/service.py
@@ -0,0 +1,23 @@
+from facet import ServiceMixin
+
+from .backend import BackendService, get_service as get_backend_service
+from .ui import UIService, get_service as get_ui_service
+
+
+class SoulDiaryService(ServiceMixin):
+    def __init__(self, backend: BackendService, ui: UIService):
+        self._backend = backend
+        self._ui = ui
+
+    @property
+    def dependencies(self) -> list[ServiceMixin]:
+        return [
+            self._backend,
+            self._ui,
+        ]
+
+
+def get_service() -> SoulDiaryService:
+    backend_service = get_backend_service()
+    ui_service = get_ui_service()
+    return SoulDiaryService(backend=backend_service, ui=ui_service)
diff --git a/soul_diary/ui/app/backend/base.py b/soul_diary/ui/app/backend/base.py
index 9b6609f..71496aa 100644
--- a/soul_diary/ui/app/backend/base.py
+++ b/soul_diary/ui/app/backend/base.py
@@ -100,9 +100,11 @@ class BaseBackend:
         )
 
     async def logout(self):
+        await self.deauth()
         self._token = None
         self._encryption_key = None
         self._username = None
+        await self._local_storage.remove_auth_data()
 
     @property
     def is_auth(self) -> bool:
@@ -167,6 +169,9 @@ class BaseBackend:
     async def auth(self, username: str, password: str) -> str:
         raise NotImplementedError
 
+    async def deauth(self):
+        raise NotImplementedError
+
     async def get_options(self) -> Options:
         raise NotImplementedError
 
diff --git a/soul_diary/ui/app/backend/exceptions.py b/soul_diary/ui/app/backend/exceptions.py
index a5ba4cd..502a057 100644
--- a/soul_diary/ui/app/backend/exceptions.py
+++ b/soul_diary/ui/app/backend/exceptions.py
@@ -2,6 +2,10 @@ class BackendException(Exception):
     pass
 
 
+class RegistrationNotSupportedException(BackendException):
+    pass
+
+
 class UserAlreadyExistsException(BackendException):
     pass
 
diff --git a/soul_diary/ui/app/backend/local.py b/soul_diary/ui/app/backend/local.py
index c556f86..0e2ef00 100644
--- a/soul_diary/ui/app/backend/local.py
+++ b/soul_diary/ui/app/backend/local.py
@@ -54,6 +54,9 @@ class LocalBackend(BaseBackend):
 
         return auth_block
 
+    async def deauth(self):
+        pass
+
     async def get_options(self) -> Options:
         return Options(registration_enabled=True)
 
diff --git a/soul_diary/ui/app/backend/models.py b/soul_diary/ui/app/backend/models.py
index 14cf559..184d607 100644
--- a/soul_diary/ui/app/backend/models.py
+++ b/soul_diary/ui/app/backend/models.py
@@ -1,9 +1,10 @@
 import uuid
+from datetime import datetime
 
-from pydantic import AwareDatetime, BaseModel
+from pydantic import BaseModel
 
 
 class SenseBackendData(BaseModel):
     id: uuid.UUID
     data: str
-    created_at: AwareDatetime
+    created_at: datetime
diff --git a/soul_diary/ui/app/backend/soul.py b/soul_diary/ui/app/backend/soul.py
new file mode 100644
index 0000000..4348fbb
--- /dev/null
+++ b/soul_diary/ui/app/backend/soul.py
@@ -0,0 +1,173 @@
+import uuid
+from typing import Any
+
+import httpx
+import yarl
+
+from soul_diary.ui.app.local_storage import LocalStorage
+from soul_diary.ui.app.models import BackendType, Options
+from .base import BaseBackend
+from .exceptions import (
+    IncorrectCredentialsException,
+    NonAuthenticatedException,
+    RegistrationNotSupportedException,
+    SenseNotFoundException,
+    UserAlreadyExistsException,
+)
+from .models import SenseBackendData
+
+
+class SoulBackend(BaseBackend):
+    BACKEND = BackendType.SOUL
+
+    def __init__(
+            self,
+            url: yarl.URL | str,
+            local_storage: LocalStorage,
+            username: str | None = None,
+            encryption_key: str | None = None,
+            token: str | None = None,
+    ):
+        self._url = yarl.URL(url)
+        self._client = httpx.AsyncClient()
+
+        super().__init__(
+            local_storage=local_storage,
+            username=username,
+            encryption_key=encryption_key,
+            token=token,
+        )
+
+    def get_backend_data(self) -> dict[str, Any]:
+        return {"url": str(self._url)}
+
+    async def request(
+            self,
+            method: str,
+            path: str,
+            json = None,
+            params: dict[str, Any] | None = None,
+    ):
+        url = self._url / path.lstrip("/")
+        headers = {}
+        if self._token:
+            headers["Authorization"] = f"Bearer {self._token}"
+
+        response = await self._client.request(
+            method=method,
+            url=str(url),
+            json=json,
+            params=params,
+            headers=headers,
+        )
+
+        try:
+            response.raise_for_status()
+        except httpx.HTTPStatusError as exc:
+            if exc.response.status_code == 401:
+                raise NonAuthenticatedException()
+            else:
+                raise exc
+
+        return response.json()
+
+    async def create_user(self, username: str, password: str) -> str:
+        path = "/signup"
+        data = {
+            "username": username,
+            "password": password,
+        }
+
+        try:
+            response = await self.request(method="POST", path=path, json=data)
+        except httpx.HTTPStatusError as exc:
+            response = exc.response.json()
+            if response == {"detail": "User already exists."}:
+                raise UserAlreadyExistsException()
+            elif response == {"detail": "Registration not supported."}:
+                raise RegistrationNotSupportedException()
+            else:
+                raise exc
+
+        return response["token"]
+
+    async def auth(self, username: str, password: str) -> str:
+        path = "/signin"
+        data = {
+            "username": username,
+            "password": password,
+        }
+
+        try:
+            response = await self.request(method="POST", path=path, json=data)
+        except NonAuthenticatedException:
+            raise IncorrectCredentialsException()
+
+        return response["token"]
+
+    async def deauth(self):
+        path = "/logout"
+
+        await self.request(method="POST", path=path)
+
+    async def get_options(self) -> Options:
+        path = "/options"
+
+        response = await self.request(method="GET", path=path)
+
+        return Options.model_validate(response)
+
+    async def fetch_sense_list(
+            self,
+            page: int = 1,
+            limit: int = 10,
+    ) -> list[SenseBackendData]:
+        path = "/senses/"
+        params = {"page": page, "limit": limit}
+
+        response = await self.request(method="GET", path=path, params=params)
+        senses = [SenseBackendData.model_validate(sense) for sense in response["data"]]
+
+        return senses
+
+    async def fetch_sense(self, sense_id: uuid.UUID) -> SenseBackendData:
+        path = f"/senses/{sense_id}"
+
+        try:
+            response = await self.request(method="GET", path=path)
+        except httpx.HTTPStatusError as exc:
+            if exc.response.status_code == 404:
+                raise SenseNotFoundException()
+            else:
+                raise exc
+
+        return SenseBackendData.model_validate(response)
+
+    async def pull_sense_data(
+            self,
+            data: str,
+            sense_id: uuid.UUID | None = None,
+    ) -> SenseBackendData:
+        path = "/senses/" if sense_id is None else f"/senses/{sense_id}"
+        request_data = {"data": data}
+
+        try:
+            response = await self.request(method="POST", path=path, json=request_data)
+        except httpx.HTTPStatusError as exc:
+            if exc.response.status_code == 404:
+                raise SenseNotFoundException()
+            else:
+                raise exc
+
+        return SenseBackendData.model_validate(response)
+
+    async def delete_sense(self, sense_id: uuid.UUID):
+        path = f"/senses/{sense_id}"
+
+        try:
+            await self.request(method="DELETE", path=path)
+        except httpx.HTTPStatusError as exc:
+            if exc.response.status_code == 404:
+                raise SenseNotFoundException()
+            else:
+                raise exc
diff --git a/soul_diary/ui/app/local_storage.py b/soul_diary/ui/app/local_storage.py
index 937296b..e050210 100644
--- a/soul_diary/ui/app/local_storage.py
+++ b/soul_diary/ui/app/local_storage.py
@@ -35,9 +35,11 @@ class LocalStorage:
         await self.raw_write("soul_diary.client", auth_data.model_dump(mode="json"))
 
     async def get_auth_data(self) -> AuthData | None:
-        if await self.raw_contains("soul_diary.client"):
-            data = await self.raw_read("soul_diary.client")
-            return AuthData.model_validate(data)
+        if not await self.raw_contains("soul_diary.client"):
+            return None
+
+        data = await self.raw_read("soul_diary.client")
+        return AuthData.model_validate(data)
 
     async def remove_auth_data(self):
         if await self.raw_contains("soul_diary.client"):
diff --git a/soul_diary/ui/app/middleware.py b/soul_diary/ui/app/middleware.py
index 8cad5e3..8bcee65 100644
--- a/soul_diary/ui/app/middleware.py
+++ b/soul_diary/ui/app/middleware.py
@@ -9,6 +9,7 @@ from soul_diary.ui.app.routes import AUTH, SENSE_LIST
 async def middleware(page: flet.Page, params: Params, basket: Basket):
     local_storage = LocalStorage(client_storage=page.client_storage)
     auth_data = await local_storage.get_auth_data()
+    # await local_storage._client_storage.clear_async()
     if auth_data is None:
         await page.go_async(AUTH)
         return
diff --git a/soul_diary/ui/app/models.py b/soul_diary/ui/app/models.py
index f2eeae2..168ff86 100644
--- a/soul_diary/ui/app/models.py
+++ b/soul_diary/ui/app/models.py
@@ -1,7 +1,8 @@
 import enum
 import uuid
+from datetime import datetime
 
-from pydantic import AwareDatetime, BaseModel, constr
+from pydantic import BaseModel, constr
 
 
 class Emotion(str, enum.Enum):
@@ -24,7 +25,7 @@ class Sense(BaseModel):
     feelings: constr(min_length=1, strip_whitespace=True)
     body: constr(min_length=1, strip_whitespace=True)
     desires: constr(min_length=1, strip_whitespace=True)
-    created_at: AwareDatetime
+    created_at: datetime
 
 
 class Options(BaseModel):
diff --git a/soul_diary/ui/app/views/auth.py b/soul_diary/ui/app/views/auth.py
index 1b29923..a1f5615 100644
--- a/soul_diary/ui/app/views/auth.py
+++ b/soul_diary/ui/app/views/auth.py
@@ -6,7 +6,7 @@ import flet
 from pydantic import AnyHttpUrl
 
 from soul_diary.ui.app.backend.exceptions import IncorrectCredentialsException, UserAlreadyExistsException
-from soul_diary.ui.app.backend.local import LocalBackend
+from soul_diary.ui.app.backend.soul import SoulBackend
 from soul_diary.ui.app.local_storage import LocalStorage
 from soul_diary.ui.app.middlewares.base import BaseMiddleware
 from soul_diary.ui.app.models import BackendType, Options
@@ -243,11 +243,16 @@ class AuthView(BaseView):
 
     async def connect_to_soul_server(self) -> Options:
         try:
-            AnyHttpUrl(self.backend_data.get("url"))
+            backend_url = AnyHttpUrl(self.backend_data.get("url"))
         except ValueError:
             raise SoulServerIncorrectURL()
-        raise
-
+        
+        backend_client = SoulBackend(
+            local_storage=self.local_storage,
+            url=str(backend_url),
+        )
+        return await backend_client.get_options()
+        
     async def callback_change_username(self, event: flet.ControlEvent):
         self.username = event.control.value
 
@@ -268,10 +273,13 @@ class AuthView(BaseView):
             await event.page.update_async()
             return
 
-        if self.backend == BackendType.LOCAL:
-            backend_client = LocalBackend(local_storage=self.local_storage)
-        else:
+        backend_client_class = self.BACKEND_MAPPING.get(self.backend)
+        if backend_client_class is None:
             raise
+        backend_client = backend_client_class(
+            local_storage=self.local_storage,
+            **self.backend_data,
+        )
 
         async with self.in_progress(page=event.page):
             try:
@@ -297,10 +305,13 @@ class AuthView(BaseView):
             await event.page.update_async()
             return
 
-        if self.backend == BackendType.LOCAL:
-            backend_client = LocalBackend(local_storage=self.local_storage)
-        else:
+        backend_client_class = self.BACKEND_MAPPING.get(self.backend)
+        if backend_client_class is None:
             raise
+        backend_client = backend_client_class(
+            local_storage=self.local_storage,
+            **self.backend_data,
+        )
 
         async with self.in_progress(page=event.page):
             try:
diff --git a/soul_diary/ui/app/views/base.py b/soul_diary/ui/app/views/base.py
index 0b8ef6f..ebf0467 100644
--- a/soul_diary/ui/app/views/base.py
+++ b/soul_diary/ui/app/views/base.py
@@ -8,6 +8,7 @@ from flet_route import Basket, Params
 from soul_diary.ui.app.backend.base import BaseBackend
 from soul_diary.ui.app.backend.exceptions import NonAuthenticatedException
 from soul_diary.ui.app.backend.local import LocalBackend
+from soul_diary.ui.app.backend.soul import SoulBackend
 from soul_diary.ui.app.local_storage import LocalStorage
 from soul_diary.ui.app.middlewares.base import BaseMiddleware
 from soul_diary.ui.app.models import BackendType
@@ -67,6 +68,11 @@ class MetaView(type):
 
 
 class BaseView(metaclass=MetaView):
+    BACKEND_MAPPING = {
+        BackendType.LOCAL: LocalBackend,
+        BackendType.SOUL: SoulBackend,
+    }
+
     is_abstract = True
     _initial_view: Callable | None
 
@@ -126,14 +132,13 @@ class BaseView(metaclass=MetaView):
         if self._initial_view is not None:
             await self._initial_view(page=page)
 
-    async def get_backend_client(self, page: flet.Page) -> BaseBackend:
+    async def get_backend_client(self) -> BaseBackend:
         auth_data = await self.local_storage.get_auth_data()
         if auth_data is None:
             raise NonAuthenticatedException()
 
-        if auth_data.backend == BackendType.LOCAL:
-            backend_client_class = LocalBackend
-        else:
+        backend_client_class = self.BACKEND_MAPPING.get(auth_data.backend, None)
+        if backend_client_class is None:
             raise
 
         return backend_client_class(
diff --git a/soul_diary/ui/app/views/sense_add.py b/soul_diary/ui/app/views/sense_add.py
index a18fecf..0932786 100644
--- a/soul_diary/ui/app/views/sense_add.py
+++ b/soul_diary/ui/app/views/sense_add.py
@@ -225,7 +225,7 @@ class SenseAddView(BaseView):
             await event.page.update_async()
             return
 
-        backend_client = await self.get_backend_client(page=event.page)
+        backend_client = await self.get_backend_client()
         async with self.in_progress(page=event.page):
             await backend_client.create_sense(
                 emotions=self.emotions,
diff --git a/soul_diary/ui/app/views/sense_list.py b/soul_diary/ui/app/views/sense_list.py
index 1dcad41..db8ce53 100644
--- a/soul_diary/ui/app/views/sense_list.py
+++ b/soul_diary/ui/app/views/sense_list.py
@@ -74,9 +74,7 @@ class SenseListView(BaseView):
         if auth_data is None:
             raise NonAuthenticatedException()
 
-        if auth_data.backend == BackendType.LOCAL:
-            pass
-        backend_client = await self.get_backend_client(page=page)
+        backend_client = await self.get_backend_client()
         senses = await backend_client.get_sense_list()
         self.cards.controls = [await self.render_card_from_sense(sense) for sense in senses]
         await page.update_async()
@@ -98,5 +96,6 @@ class SenseListView(BaseView):
         await event.page.go_async(SENSE_ADD)
 
     async def callback_logout(self, event: flet.ControlEvent):
-        await self.local_storage.remove_auth_data()
+        backend_client = await self.get_backend_client()
+        await backend_client.logout()
         await event.page.go_async(AUTH)
diff --git a/soul_diary/ui/cli.py b/soul_diary/ui/cli.py
index 3be2151..1397eb7 100644
--- a/soul_diary/ui/cli.py
+++ b/soul_diary/ui/cli.py
@@ -1,11 +1,21 @@
+import asyncio
+
 import typer
 
 from . import web
+from .service import get_service
+
+
+def run():
+    ui_service = get_service()
+
+    asyncio.run(ui_service.run())
 
 
 def get_cli() -> typer.Typer:
     cli = typer.Typer()
 
+    cli.command(name="run")(run)
     cli.add_typer(web.get_cli(), name="web")
 
     return cli
diff --git a/soul_diary/ui/web/service.py b/soul_diary/ui/web/service.py
index 01590f8..77b5efc 100644
--- a/soul_diary/ui/web/service.py
+++ b/soul_diary/ui/web/service.py
@@ -25,9 +25,8 @@ class WebService(ServiceMixin):
 
     async def start(self):
         app = flet_fastapi.app(SoulDiaryApp(
-            # backend=BackendType.SOUL,
-            # backend_data=self._backend_data,
-            backend=BackendType.LOCAL,
+            backend=BackendType.SOUL,
+            backend_data=self._backend_data,
         ).run)
         config = uvicorn.Config(app=app, host="0.0.0.0", port=self._port)
         server = UvicornServer(config)
diff --git a/soul_diary/ui/web/settings.py b/soul_diary/ui/web/settings.py
index 5933ceb..db7dd15 100644
--- a/soul_diary/ui/web/settings.py
+++ b/soul_diary/ui/web/settings.py
@@ -1,10 +1,12 @@
 from typing import Any
 
 from pydantic import conint
-from pydantic_settings import BaseSettings
+from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
 class WebSettings(BaseSettings):
+    model_config = SettingsConfigDict(env_prefix="ui_web_")
+
     port: conint(ge=1, le=65535) = 8000
     backend_data: dict[str, Any] = {
         "url": "http://localhost:8001",