diff --git a/README.md b/README.md
index 135b0c8..5eb0be3 100644
--- a/README.md
+++ b/README.md
@@ -6,9 +6,9 @@ Système de création de contenu rétrospectif
 
 ## Backend
 
-| Route              | Method | Description          | 
-|--------------------|--------|----------------------| 
-| /import/data       | POST   | Import raw data      | 
-| /analyse/{data_id} | GET    | Analyse stored data  | 
-| /export/{data_id}  | GET    | Export analysed data | 
-| /generate/content  | POST   | Generate new content |
\ No newline at end of file
+| Route      | Method | Description          | 
+|------------|--------|----------------------| 
+| /import/   | POST   | Import raw data      | 
+| /analysis/  | GET    | Analysis stored data  | 
+| /export/   | GET    | Export analysed data | 
+| /generate/ | POST   | Generate new content |
\ No newline at end of file
diff --git a/backend/main.py b/backend/main.py
index 794ca49..4e7dd56 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -1,67 +1,16 @@
-from fastapi import FastAPI, APIRouter, HTTPException
-import uuid
+from fastapi import FastAPI
+from routers.convert_router import convert_router
+from routers.import_router import import_router
+from routers.analysis_router import analysis_router
+from routers.export_router import export_router
+from routers.generate_router import generate_router
+
 
 app = FastAPI(title="Retro API", description="Retro content management system")
 
-# Routers
-import_router = APIRouter(prefix="/import", tags=["Import"])
-analyse_router = APIRouter(prefix="/analyse", tags=["Analyse"])
-export_router = APIRouter(prefix="/export", tags=["Export"])
-generate_router = APIRouter(prefix="/generate", tags=["Generate"])
-
-# Sample data storage (replace with Milvus/DB integration)
-data_store = {}
-
-# Import Router
-@import_router.post("/data")
-def import_data(data: dict):
-    """
-    Import data (e.g., text, files, or structured data).
-    """
-    data_id = str(uuid.uuid4())
-    data_store[data_id] = data
-    return {"message": "Data imported successfully", "data_id": data_id}
-
-# Analyse Router
-@analyse_router.get("/{data_id}")
-def analyse_data(data_id: str):
-    """
-    Analyse imported data (e.g., sentiment, keywords, or patterns).
-    """
-    if data_id not in data_store:
-        raise HTTPException(status_code=404, detail="Data not found")
-    # Placeholder for analysis logic
-    return {
-        "data_id": data_id,
-        "analysis": {"word_count": len(data_store[data_id].get("text", ""))},
-    }
-
-# Export Router
-@export_router.get("/{data_id}")
-def export_data(data_id: str):
-    """
-    Export analysed data (e.g., as JSON, CSV, or PDF).
-    """
-    if data_id not in data_store:
-        raise HTTPException(status_code=404, detail="Data not found")
-    return {
-        "data_id": data_id,
-        "content": data_store[data_id],
-        "status": "exported",
-    }
-
-# Generate Router
-@generate_router.post("/content")
-def generate_content(prompt: str):
-    """
-    Generate new content (e.g., text, images, or summaries).
-    """
-    # Placeholder for generation logic (e.g., LLM, AI model)
-    generated = {"response": f"Generated content based on: {prompt}"}
-    return {"message": "Content generated", "data": generated}
-
 # Include routers in the main app
+app.include_router(convert_router)
 app.include_router(import_router)
-app.include_router(analyse_router)
+app.include_router(analysis_router)
 app.include_router(export_router)
 app.include_router(generate_router)
diff --git a/backend/models.py b/backend/models.py
new file mode 100644
index 0000000..c6ebddf
--- /dev/null
+++ b/backend/models.py
@@ -0,0 +1,48 @@
+from typing import Dict
+
+from pydantic import BaseModel
+
+
+class AnalysisRequest:
+    analysis_type: str
+    filters: Dict
+
+class AnalysisResponse:
+    result: str
+
+
+class ConversionRequest(BaseModel):
+    source_type: str
+    source_data: str
+
+
+class ConversionResponse(BaseModel):
+    converted_data: dict
+    status: str
+
+
+class ExportRequest:
+    filters: Dict
+    format: str
+
+
+class ExportResponse:
+    export_url: str
+    status: str
+
+
+class GenerateRequest:
+    prompt: str
+
+
+class GenerateResponse:
+    content_url: str
+    status: str
+
+
+class ImportRequest:
+    data: str
+
+
+class ImportResponse:
+    status: str
diff --git a/backend/routers/analysis_router.py b/backend/routers/analysis_router.py
new file mode 100644
index 0000000..425a3c8
--- /dev/null
+++ b/backend/routers/analysis_router.py
@@ -0,0 +1,14 @@
+from fastapi import APIRouter
+
+from backend.models import AnalysisResponse, AnalysisRequest
+
+analysis_router = APIRouter(prefix="/analysis", tags=["Analysis"])
+
+@analysis_router.post("/", response_model=AnalysisResponse)
+def analysis_data(request: AnalysisRequest):
+    """
+    Analysis imported data (e.g., sentiment, keywords, or patterns).
+    """
+    # Placeholder for analysis logic
+    analysis = ...
+    return {"analysis": analysis}
diff --git a/backend/routers/convert_router.py b/backend/routers/convert_router.py
new file mode 100644
index 0000000..39a4e54
--- /dev/null
+++ b/backend/routers/convert_router.py
@@ -0,0 +1,18 @@
+from fastapi import APIRouter
+
+from backend.models import ConversionResponse, ConversionRequest
+
+convert_router = APIRouter(prefix="/convert", tags=["Convert"])
+
+@convert_router.post("/", response_model=ConversionResponse)
+def convert_data(request: ConversionRequest):
+    """
+    Convert data from one format to another (e.g., JSON to CSV, text to XML).
+    """
+    # Example conversion logic (replace with actual implementation)
+    converted_data = ...
+
+    return {
+        "converted_data": converted_data,
+        "status": "success"
+    }
diff --git a/backend/routers/export_router.py b/backend/routers/export_router.py
new file mode 100644
index 0000000..eadacad
--- /dev/null
+++ b/backend/routers/export_router.py
@@ -0,0 +1,13 @@
+from fastapi import APIRouter
+
+from backend.models import ExportRequest, ExportResponse
+
+export_router = APIRouter(prefix="/export", tags=["Export"])
+
+@export_router.post("/", response_model=ExportResponse)
+def export_data(request: ExportRequest):
+    """
+    Export analysed data (e.g., as JSON, CSV, or PDF).
+    """
+    exported_data_url = ...
+    return {"url": exported_data_url}
diff --git a/backend/routers/generate_router.py b/backend/routers/generate_router.py
new file mode 100644
index 0000000..8f60886
--- /dev/null
+++ b/backend/routers/generate_router.py
@@ -0,0 +1,15 @@
+from fastapi import APIRouter
+
+from backend.models import GenerateResponse, GenerateRequest
+
+generate_router = APIRouter(prefix="/generate", tags=["Generate"])
+
+
+@generate_router.post("/", response_model=GenerateResponse)
+def generate_content(request: GenerateRequest):
+    """
+    Generate new content (e.g., text, images, or summaries).
+    """
+    # Placeholder for generation logic (e.g., LLM, AI model)
+    response = ...
+    return response
diff --git a/backend/routers/import_router.py b/backend/routers/import_router.py
new file mode 100644
index 0000000..9c4a15e
--- /dev/null
+++ b/backend/routers/import_router.py
@@ -0,0 +1,14 @@
+from fastapi import APIRouter
+
+from backend.models import ImportRequest, ImportResponse
+
+import_router = APIRouter(prefix="/import", tags=["Import"])
+
+
+@import_router.post("/", response_model=ImportResponse)
+def import_data(request: ImportRequest):
+    """
+    Import data (e.g., text, files, or structured data).
+    """
+    response = ...
+    return response