Mern Stack Developer

Ignitho; Chennai District; On-site; INR 1,800,000 - 3,200,000; Full time

Job summary

Ignitho in Chennai develops AI-powered solutions and scalable web applications. The role focuses on building AI agent features, integrating OpenAI/Claude/Gemini APIs, and ensuring robust production-grade workflows and memory handling.

You will design REST APIs with Node.js, React frontends, and secure, scalable backends, while collaborating with cross-functional teams to deliver high-quality software.

Qualifications

• Experience building REST APIs with Node.js and Express.js
• Proficiency in MongoDB and Mongoose
• Proficient in JavaScript/TypeScript and React.js
• Knowledge of RBAC and API security
• Ability to design scalable architectures and clean code

Responsibilities

• Build, extend, and productionise AI agent features with tool calling and multi-step workflows.
• Integrate LLM APIs into product features with robust error handling and retries.
• Harden AI code for production with tests and secure endpoints.
• Collaborate to design scalable REST APIs and frontend components in React.js.
• Ensure architecture follows MVC/Layered patterns and write clean, documented code.

Skills

Backend Node.js

Express.js

React.js

TypeScript

JWT Authentication

MVC Architecture

Security best practices

Tools

LangChain

LangGraph

OpenAI API

Claude API

Gemini API

Job description

Key Responsibilities

AI Agent Development (Core)

• Build, extend, and productionise AI agent features tool calling, multi-step workflows, memory handling, and structured output validation.
• Integrate LLM APIs (OpenAI, Anthropic Claude, and similar) into product features with robust error handling, retry logic, and fallback chains.
• Implement guardrails, output validation, and hallucination checks to ensure AI features are reliable enough for enterprise B2B use.
• Take AI-generated and prototype code and harden it for production adding tests, securing endpoints, and resolving edge cases.
• Work with AI frameworks or libraries such as LangChain or equivalent tools to create simple AI workflows and prompt-based applications.

Application Development

• Design, develop, and maintain scalable REST APIs using Node.js, Express.js, and MongoDB.
• Build responsive, scalable React.js frontends and develop RESTful APIs using Node.js and Express.js.
• Integrate frontend components with backend APIs, databases, and AI services.
• Build backend modules independently such as Authentication, User Management, Dashboard APIs, Notifications, and Admin modules.
• Design database schemas and write optimized MongoDB queries using Mongoose, including aggregations and indexes when required.
• Implement authentication, authorization (RBAC), and API security.
• Optimise backend performance and database queries. Follow clean architecture principles by organizing code using MVC or layered architecture with Controllers, Services, Models, and Routes.
• Create and optimise prompts to generate structured and reliable responses from AI models.
• Develop reusable and responsive UI components using React.js and integrate them with backend APIs.

Quality, Testing & Collaboration

• Collaborate with cross-functional teams to understand requirements, estimate effort, and deliver features within timelines.
• Write clean, maintainable, and well-documented code, participate in code reviews, and follow software engineering best practices
• Use AI-powered development tools (Cursor, GitHub Copilot, Claude Code) responsibly to accelerate delivery while ensuring correctness and security.

Technical Skills & Expertise

AI & Generative AI Skills (Core)

• Experience working with OpenAI API, Claude API, and Gemini API
• Hands-on experience with LangChain and LangGraph
• Strong understanding of Prompt Engineering
• Ability to generate and process Structured JSON Outputs
• Experience integrating AI Chatbots and AI Assistants into applications Knowledge of AI Agent Development and autonomous workflows

Must-Have Skills

• Backend Development: Node.js, Express.js
• Database Management: MongoDB, Mongoose, PostgreSQL
• API Development: RESTful APIs
• Programming Languages: JavaScript, TypeScript
• Frontend Development: React.js
• Version Control: Git
• Authentication & Security: JWT Authentication
• Architecture & Design Patterns: MVC Architecture, Layered Architecture