Node Developer

Kumaran Systems; Chennai; On-site; INR 900,000 - 1,400,000; Full time

Job summary

Kumaran Systems is 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 role focuses on building robust services using Node.js, Express.js, and MongoDB, with emphasis on secure authentication and clean code practices.

The candidate will contribute to modernizing legacy code, collaborate with cross-functional teams, and ensure reliable deployments through CI/CD processes.

Qualifications

• 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.

Responsibilities

• Design, develop, and maintain 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.
• Implement authentication/authorization with JWT and secure cookies/sessions.
• Ensure secure coding practices: validation, logging, and error handling.
• Collaborate with DevOps on CI/CD pipelines and source control.
• Refactor and modernize legacy code while preserving functionality.

Skills

Node.js

Express.js

MongoDB

JavaScript

REST APIs

JWT

Tools

Axios

Git

Jest

CI/CD

Job description

About UsKumaran Systems: Engineering Future-Ready Transformations Since 1992, Kumaran Systems has been helping enterprises bridge the past and the future, reimagining legacy systems and embracing AI-led possibilities. With over 34 years of delivery excellence, we specialise in re-engineering core applications, driving cloud transformation, and building automation-first, GenAI-enabled ecosystems across the Banking and Financial Services, Insurance, Telecom, and Automotive sectors. We help organisations not just upgrade their systems but reimagine what’s possible.

About UsKumaran Systems: Engineering Future-Ready Transformations Since 1992, Kumaran Systems has been helping enterprises bridge the past and the future, reimagining legacy systems and embracing AI-led possibilities. With over 34 years of delivery excellence, we specialise in re-engineering core applications, driving cloud transformation, and building automation-first, GenAI-enabled ecosystems across the Banking and Financial Services, Insurance, Telecom, and Automotive sectors. We help organisations not just upgrade their systems but reimagine what’s possible. Why Kumaran? We blend engineering discipline with AI innovation, helping clients modernise with confidence, automate with clarity, and scale with purpose. Our global delivery model ensures agility, responsiveness, and seamless collaboration, with clients always at the heart of every engagement. At Kumaran, we don’t just solve problems, we engineer future-ready transformations. 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 strong 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.