I specialize in building robust, scalable, and high-performance backend solutions using NestJS, a powerful framework based on Node.js and TypeScript. My approach ensures security, maintainability, and efficiency, making applications ready for production with well-structured, modular architectures. Core Technologies & Expertise NestJS & TypeScript – Writing type-safe, structured, and maintainable backend logic. Authentication & Authorization – Implementing secure user authentication using Passport.js, including JWT-based authentication, OAuth strategies, and session-based login. API Documentation – Using Swagger (OpenAPI) to generate clear and interactive API documentation for seamless integration with frontend applications. API Testing & Debugging – Utilizing Postman for testing and debugging API endpoints, ensuring reliability and stability. Secure Routes & Access Control – Implementing role-based access control (RBAC), authentication guards, and middleware to restrict access to sensitive endpoints. Data Validation & Sanitization – Using class-validator and class-transformer to enforce strict data validation. Error Handling & Logging Global Exception Filters – Implementing custom error-handling filters to standardize API responses and improve debugging. Advanced Logging – Using Winston to log errors, requests, and application events, ensuring efficient debugging and monitoring. Structured Error Responses – Providing detailed error messages while securing sensitive system information. Task Scheduling & Automation Cron Jobs – Automating periodic tasks such as database cleanups, report generation, email notifications, and scheduled API requests. Queue Processing – Implementing message queues (e.g., BullMQ, Redis) for handling background jobs and async operations efficiently. Security & Performance Optimization Rate Limiting & Throttling – Protecting APIs from abuse by limiting the number of requests per user/IP. CORS Configuration – Controlling access to APIs with proper CORS policies. Data Encryption & Security Best Practices – Storing sensitive user data securely, implementing hashing (bcrypt), and preventing SQL injection & XSS attacks. Development Workflow & Tools Modular Architecture – Writing scalable and maintainable code with service-oriented architecture and dependency injection. Decorators & Guards – Using NestJS decorators and custom guards to enhance code readability and structure. Database Integration – Working with PostgreSQL, MongoDB, and MySQL using Prisma, TypeORM, or Drizzle ORM. I ensure that backend systems are scalable, secure, and maintainable, following best practices in API development, authentication, error handling, and performance optimization. Whether it’s building RESTful APIs, real-time applications, or enterprise-level backend architectures, I bring expertise to every aspect of backend development.