AI Fullstack Senior Software Engineer (MERN Stack)

Gen; Chennai District; On-site; INR 1,200,000 - 2,000,000; Full time

Job summary

Gen is seeking an AI Fullstack Senior Software Engineer in Chennai, India, who will lead the design and development of cutting-edge fullstack web applications using the MERN stack. The role emphasizes high-quality delivery and incorporating AI-driven practices into engineering.

Ideal candidates should have over 6 years of experience in software development, profound proficiency in both frontend and backend technologies, and a passion for innovative solutions in a high-impact team setting.

Qualifications

• 6+ years of hands-on experience in fullstack web development.
• Proven experience building production-grade applications using the MERN stack.
• Experience with AI-enabled product capabilities preferred.

Responsibilities

• Lead design, development, and delivery of fullstack web applications.
• Build responsive and reusable frontend components.
• Develop scalable backend services and REST APIs.
• Integrate AI capabilities into products.

Skills

JavaScript or TypeScript proficiency

MERN stack experience

Frontend application development with React

Backend development with Node.js

Database design in MongoDB

CI/CD automation

AI-assisted development tools experience

Tools

GitHub

Jenkins

Playwright

Job description

About the Role

We are looking for an AI Fullstack Senior Software Engineer with strong MERN stack expertise and a passion for building modern, intelligent, scalable web applications. You will be part of a high‑impact engineering team, contributing to customer‑facing products and internal platforms while embedding AI‑first development practices into day‑to‑day engineering.

This role is execution focused: you will lead the design and delivery of high‑quality fullstack solutions across frontend, backend, APIs, and cloud‑integrated workflows, while helping shape technical direction and engineering standards.

Key Responsibilities

• Lead the design, development, and delivery of complex fullstack web applications using MongoDB, Express.js, React, and Node.js.
• Build responsive, performant, and reusable frontend components using React, modern JavaScript/TypeScript, HTML, and CSS.
• Develop scalable backend services, REST APIs, and microservices using Node.js and Express.
• Design and optimize data models, queries, and integrations using MongoDB and related persistence patterns.
• Own technical solutions end‑to‑end, from architecture and development to testing, deployment, observability, and post‑release improvements.
• Operate as an end‑to‑end engineer who can independently drive complex feature development, unit testing, debugging, functional validation, and production readiness.
• Apply AI‑assisted engineering tools such as GitHub Copilot, Cursor, Claude Code, and similar platforms to accelerate coding, debugging, documentation, test creation, and root‑cause analysis.
• Drive AI‑first practices within the team by identifying repeatable workflows where AI can improve developer efficiency, speed, quality, and maintainability.
• Integrate AI‑powered capabilities into products where relevant, including LLM‑based workflows, intelligent assistants, recommendations, automation, or developer tooling.
• Write and maintain strong unit, integration, and end‑to‑end test coverage using modern testing frameworks across frontend and backend stacks.
• Build and improve CI/CD pipelines using GitHub Actions, Jenkins, TeamCity, or equivalent tooling to enable reliable builds and releases.
• Monitor application health, reliability, and performance using logs, dashboards, tracing, and alerting tools, and proactively drive improvements.
• Partner closely with Product, Design, Data, Security, and platform teams to deliver cohesive and high‑quality customer experiences.
• Participate in code reviews, design reviews, and technical discussions, while mentoring junior engineers and helping raise engineering standards.
• Help define and promote best practices for architecture, clean code, security, performance, scalability, and developer productivity.

About You

6+ years of hands‑on experience in fullstack web development.

• Strong proficiency in JavaScript or TypeScript across both frontend and backend development.
• Proven experience building production‑grade applications using the MERN stack: MongoDB, Express.js, React, and Node.js; experience with other modern JavaScript frameworks and ecosystems such as Angular, Vue.js, Next.js, or similar is preferred.
• Strong experience building modern frontend applications with React, state management patterns, component design, and API integration.
• Proven ability to independently drive complex features and make sound technical decisions.
• Solid experience in backend development with Node.js, API design, authentication, authorization, and service integration.
• Good understanding of database design, schema modeling, indexing, and performance optimization in MongoDB.
• Experience with AI‑assisted development tools and a practical mindset for using them to improve engineering outcomes.
• Experience building or integrating AI‑enabled product capabilities, such as LLM‑based features, prompt workflows, embeddings, semantic search, or automation services, is strongly preferred.
• Strong understanding of software design patterns, modular architecture, and scalable distributed system principles.
• Experience with unit testing, integration testing, and end‑to‑end testing frameworks such as Jest, React Testing Library, Cypress, or Playwright.
• Experience with CI/CD automation, version control systems such as GitHub, and modern engineering workflows.
• Familiarity with cloud platforms, containerization, and deployment environments is preferred.
• Exposure to observability, experimentation, feature flags, and modern release strategies is a plus.
• Strong debugging, performance tuning, and problem‑solving skills across frontend and backend systems.
• Strong communication, ownership, and collaboration skills in cross‑functional teams.
• Proven ability to work independently and manage multiple priorities in a fast‑paced engineering environment.
• Experience mentoring engineers and influencing technical direction beyond individual feature ownership is a plus.
• Work in an AI‑first engineering environment where modern tools help you move faster and build better software.
• Own meaningful technical problems end‑to‑end across design, development, test, release, and monitoring.
• Contribute to high‑impact initiatives with visible customer and business outcomes.
• Grow in a modern engineering ecosystem spanning AI, automation, cloud, and scalable web platforms.
• Be part of a collaborative hybrid culture that values both speed and flexibility.