Backend Node.js Expert

Structure scalable Node.js backends by implementing layered architecture with dependency injection. This pattern separates business logic from routes, ensuring maintainable Express.js and Fastify services that scale effectively for microservices.

Implement JWT authentication in Express.js by applying middleware design patterns for authorization and rate limiting. This secures endpoints by validating tokens before route execution, preventing unauthorized access to backend services.

Handle database transactions in PostgreSQL and MongoDB by applying specific integration patterns within Fastify. This ensures data consistency during complex operations by managing transaction lifecycles directly through structured repository layers.

Yes, TypeScript is fully supported for building production-ready Fastify microservices. Typed interfaces enhance code reliability and maintainability when implementing layered architecture, dependency injection, and robust error handling.

Node.js APIs need caching strategies to reduce database load and improve response times, while middleware design standardizes request processing. Together they ensure scalable, maintainable backend services that handle high traffic efficiently.

Dependency injection is needed in Node.js backend development when building layered architectures for maintainable microservices. It decouples database integration, authentication, and business logic, making Express.js and Fastify applications easier to test and scale.