diff --git a/backend/app/config.py b/backend/app/config.py
new file mode 100644
index 0000000..9ba6006
--- /dev/null
+++ b/backend/app/config.py
@@ -0,0 +1,5 @@
+import os
+
+DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./jardin.db")
+UPLOAD_DIR = os.getenv("UPLOAD_DIR", "./data/uploads")
+CORS_ORIGINS = os.getenv("CORS_ORIGINS", "http://localhost:5173").split(",")
diff --git a/backend/app/database.py b/backend/app/database.py
new file mode 100644
index 0000000..ed43eaf
--- /dev/null
+++ b/backend/app/database.py
@@ -0,0 +1,13 @@
+from sqlmodel import SQLModel, create_engine, Session
+from app.config import DATABASE_URL
+
+engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
+
+
+def get_session():
+    with Session(engine) as session:
+        yield session
+
+
+def create_db_and_tables():
+    SQLModel.metadata.create_all(engine)
diff --git a/backend/app/main.py b/backend/app/main.py
new file mode 100644
index 0000000..577dc94
--- /dev/null
+++ b/backend/app/main.py
@@ -0,0 +1,33 @@
+import os
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.config import CORS_ORIGINS, UPLOAD_DIR
+from app.database import create_db_and_tables
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    os.makedirs(UPLOAD_DIR, exist_ok=True)
+    import app.models  # noqa — enregistre tous les modèles avant create_all
+    create_db_and_tables()
+    from app.seed import run_seed
+    run_seed()
+    yield
+
+
+app = FastAPI(title="Jardin API", lifespan=lifespan)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=CORS_ORIGINS,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+
+@app.get("/api/health")
+def health():
+    return {"status": "ok"}
diff --git a/backend/app/seed.py b/backend/app/seed.py
new file mode 100644
index 0000000..1e0ab33
--- /dev/null
+++ b/backend/app/seed.py
@@ -0,0 +1,2 @@
+def run_seed():
+    pass
diff --git a/backend/requirements.txt b/backend/requirements.txt
new file mode 100644
index 0000000..ba62ba6
--- /dev/null
+++ b/backend/requirements.txt
@@ -0,0 +1,7 @@
+fastapi==0.115.5
+uvicorn[standard]==0.32.1
+sqlmodel==0.0.22
+python-multipart==0.0.12
+aiofiles==24.1.0
+pytest==8.3.3
+httpx==0.28.0