API Development: RESTful or GraphQL APIs for frontend-backend communication.
Database Schema: Design and implement relational (e.g., PostgreSQL, MySQL) or non-relational (e.g., MongoDB, DynamoDB) schemas.
Authentication & Authorization: Implement secure user authentication (e.g., OAuth, JWT, Firebase Auth) and role-based access controls.
Server-Side Testing: Test coverage for backend logic using frameworks like Mocha, Chai, or Jest.
Cloud Functions/Serverless Setup: Implement serverless functions if applicable (AWS Lambda, Firebase Functions, etc.).