Node.js, TypeScript, JavaScript, NestJS, Express.js, REST APIs, WebSocket, Socket.IO, GraphQL, Jest, Angular, MySQL, PostgreSQL, Redis, TypeORM, AWS (EC2, S3, SES, SQS, Lambda, CloudWatch), Docker, CI/CD, Microservices, TDD, JWT, SonarQube, Git, GitHub, OpenAPI, Swagger, Datadog, Sentry, GitHub Copilot, Cursor, Claude, Postman