We are seeking a Node.js Backend Developer with 4-7 years of experience to design, develop, and maintain secure, scalable backend applications and RESTful APIs. The ideal candidate will have solid expertise in Node.js, Express.js, MongoDB, and JavaScript. Key Responsibilities
• Design, develop, and enhance backend services using Node.js, JavaScript, and Express.js.
• Own the design and maintenance of secure, scalable REST APIs and middleware.
• Model and manage data using MongoDB and Mongoose (schemas, indexes, queries, transactions).
• Implement and maintain authentication/authorization with JWT, secure cookies, sessions, roles, and permissions.
• Enforce secure coding practices: validation, error handling, logging, audit trails, and consistent API responses.
• Integrate with internal/external systems using Axios/HTTP clients, TLS/SSL, and API gateways (e.g., Azure API Management).
• Handle secure file upload/download flows (Busboy, MongoDB GridFS) with proper validation and sanitization.
• Write and maintain unit and integration tests using Jest; help improve test coverage and reliability.
• Collaborate with DevOps teams on CI/CD pipelines (Jenkins, Git, Artifactory, SonarQube, Fortify,



Black Duck).
• Incrementally refactor and modernize legacy code while preserving business functionality. Mandatory Technical Skills &

Experience:
· Strong hands-on experience with Node.js and modern asynchronous JavaScript (Promises, async/await).
· Deep experience with Express.js (routing, middleware, validation, centralized error handling).
· Proven track record building and consuming RESTful APIs in production environments.
· Practical, hands-on experience with MongoDB and Mongoose.
· Experience implementing JWT-based authentication and role-based access control.
· Good understanding of web security: secure cookies, session management, CSRF, CORS, token lifecycle, and common vulnerabilities (OWASP).
· Experience integrating downstream APIs using Axios or similar HTTP clients.
· Experience with TLS/SSL certificates, timeouts, resilience patterns, and troubleshooting service-to-service communication.
· Experience writing unit tests with Jest, including mocks and async test cases.
· Working knowledge of Git workflows and CI/CD pipelines.

📌 Node Developer (Chennai)
🏢 Kumaran Systems
📍 Chennai