backend-development

REST API design involves structuring endpoints, HTTP methods, and response formats following REST principles. Secure authentication uses OAuth 2.1 with PKCE or JWT tokens to verify client identity, combined with RBAC to control access to resources based on user roles.

Implement authentication using OAuth 2.1 with PKCE for third-party integrations or JWT tokens for direct client access. Layer authorization on top with role-based access control (RBAC) and multi-factor authentication (MFA) for sensitive operations to enforce least-privilege access.

Database optimization combines data modeling for ACID compliance or NoSQL flexibility, strategic indexing to speed query execution, and caching layers to reduce database load. Choose models matching your consistency and scale requirements.

Yes. REST, GraphQL, and gRPC serve different use cases. REST is standardized and stateless; GraphQL enables flexible client queries; gRPC provides high-performance RPC for service-to-service communication. Deploy multiple protocols in the same backend architecture.

Backend reliability requires unit tests for individual functions, integration tests for component interaction, and end-to-end tests for full workflows. Pair these with automated CI/CD deployment pipelines and observability instrumentation to monitor production behavior.

Security hardening includes input validation to reject malicious data, rate limiting to prevent abuse, secure session management, and OAuth 2.1/JWT for authentication. Apply these practices consistently across API endpoints and data access layers.