first commit

backend/app/models/requirements.py

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+from pydantic import BaseModel, Field
+from typing import List, Optional
+from datetime import datetime
+
+
+class RequirementsIn(BaseModel):
+    role_name: str
+    experience_years: int = 0
+    mandatory_skills: List[str] = []
+    nice_to_have_skills: List[str] = []
+    job_description: Optional[str] = None
+
+
+class RequirementsOut(RequirementsIn):
+    id: str
+    user_id: str
+    created_at: datetime
+    updated_at: datetime