● Designed and implemented modular microservices using NestJS and TypeORM, handling high-concurrency traffic for user-facing applications. ● Built GraphQL and REST APIs with NestJS controllers/routes, leveraging decorators, pipes, and interceptors for validation, transformation, and caching. ● Managed PostgreSQL schemas, wrote optimized SQL queries, and implemented migrations via TypeORM. ● Integrated Redis for caching and distributed rate-limiting (NestJS CacheModule). ● Developed event-driven features using RabbitMQ, implemented custom message consumers/producers in NestJS. ● Implemented CI/CD pipelines in GitHub Actions, automated linting, testing, and Docker image builds. ● Deployed microservices to AWS ECS/Fargate and AWS Lambda (using Serverless Framework), ensuring >99.9% uptime. ● Mentored junior engineers in NestJS best practices, code reviews, and architectural decisions.

● Spearheaded migration from monolithic Express.js to NestJS microservices architecture, improving maintainability and scalability. ● Created authentication and authorization modules (JWT, Passport) in NestJS to secure REST endpoints. ● Designed and optimized PostgreSQL databases, implemented connection pooling and query performance tuning. ● Containerized services with Docker, orchestrated multi-service deployments via Kubernetes. ● Introduced event-driven patterns using Redis Pub/Sub and RabbitMQ for asynchronous workflows. ● Established TDD practices with Jest and SuperTest, achieving >85% code coverage. ● Collaborated with frontend teams on API contracts; used Swagger to generate documentation for NestJS controllers.