Hiring | MERN Stack Developer - Kolkata

Zoho; Kolkata District; On-site; INR 1,200,000 - 2,100,000; Full time

Job summary

Zoho in Kolkata is seeking a seasoned MERN Stack Developer to lead full-stack development, from frontend to backend, including database tuning, testing, and live deployment. You will implement Playwright for testing, build AI/LLM driven features, and automate workflows with n8n, ensuring scalable, secure, high-quality software products.

Responsibilities cover REST/GraphQL API design, MongoDB data modeling, API integrations, and CI/CD deployment.

Qualifications

• 4-7 years of professional software development experience.
• Hands-on proficiency with MERN stack (MongoDB, Express.js, React, Node.js).
• Mastery of React, hooks, and state management; Node.js/Express middleware, routing, authentication.

Responsibilities

• Design, build, and maintain scalable MERN web applications with REST/GraphQL APIs.
• Develop backend services and business logic in Node.js/Express.
• Model MongoDB schemas, optimize queries, indexing, and aggregations.
• Integrate with third-party APIs, webhooks, and payment systems.
• Implement end-to-end tests with Playwright.
• Create automation/workflows with n8n and AI/LLM integrations.
• Apply secure coding, performance optimization, and maintainable code.

Skills

MERN stack

Playwright testing

n8n automation

AI/LLM integration

Git/GitHub

CI/CD

Docker

AWS

Redis

Next.js

Tools

MongoDB

Express.js

React

Node.js

Playwright

n8n

Git

Docker

AWS

Job description

Job Description

MERN Stack Developer

Summary

We are looking for a seasoned Full Stack Developer with specialized expertise in the MERN stack to spearhead the complete lifecycle of scalable web applications. This position requires a forward-thinking professional who can oversee everything from frontend and backend architecture to database tuning, automated testing, and live deployment. The successful candidate will bring specific knowledge in Playwright for testing, n8n for workflow automation, and hands-on experience embedding AI and Large Language Model (LLM) functionalities into software products. This role is central to fostering technical innovation, upholding high code standards, and working collaboratively across teams to produce high-performance, reliable solutions.

Location: Kolkata

Responsibilities

• Design, build, and sustain scalable web applications using the MERN stack, including the development of REST and GraphQL APIs.
  
• Develop resilient backend services and business logic utilizing Node.js and Express.js.
  
• Architect, refine, and administer MongoDB data models, covering schema design, query optimization, indexing, and aggregation pipelines.
  
• Enable smooth integration with external platforms by connecting third-party APIs, webhooks, and payment processing systems.
  
• Implement rigorous end-to-end and functional testing frameworks using Playwright.
  
• Create and manage business logic automation and API-driven workflows via n8n.
  
• Integrate AI and LLM APIs to enhance application features and streamline automated processes.
  
• Utilize AI-powered coding tools and prompt engineering strategies to boost development speed and code quality.
  
• Apply advanced understanding of LLM mechanics, including tokens, context windows, embeddings, RAG, and AI agent behaviors, to address complex technical challenges.
  
• Handle version control operations, including branching strategies, code reviews, pull requests, and release management through Git-based platforms.
  
• Direct deployment procedures, manage environment configurations, handle application publishing, and provide ongoing production support.
  
• Perform detailed debugging and root-cause analysis for issues affecting applications, APIs, databases, and live systems.
  
• Uphold industry standards for secure coding, performance optimization, and long-term code maintainability.
  
• Collaborate with QA, UI/UX, Product, and DevOps teams to ensure seamless feature delivery from initial concept to final launch.
  
• Offer technical mentorship and guidance to junior team members as needed.
  

Requirements

• Hold 4-7 years of professional experience in software development.
  
• Possess extensive, hands-on proficiency with the MERN stack (MongoDB, Express.js, React, and Node.js).
  
• Demonstrate mastery of React architecture, including hooks and state management, alongside Node.js/Express capabilities such as middleware, routing, and authentication.
  
• Have a track record of implementing automated testing suites with Playwright.
  
• Demonstrate practical experience in building automation workflows, managing webhooks, and handling API integrations using n8n.
  
• Show familiarity with AI/LLM API integration, prompt engineering, and AI-assisted coding practices.
  
• Understand version control systems (Git/GitHub/GitLab), CI/CD pipelines, deployment strategies, and production environment management.
  
• Display strong problem-solving skills, a sense of ownership, effective communication abilities, and a dedication to maintaining high code quality.
  

Good to Have

• Experience with containerization using Docker and cloud deployment on platforms such as AWS.
  
• Knowledge of Redis, caching strategies, message queues (e.g., Bull/BullMQ), and techniques for performance optimization.
  
• Familiarity with Retrieval-Augmented Generation (RAG), vector databases, AI agents, or the development of AI-driven applications.
  
• A proven history of integrating OpenAI or other leading LLM platforms.
  
• Experience in creating complex automation workflows within n8n.
  
• Background in building applications using Next.js or other advanced React frameworks.