Hiring || MERN Stack Developer - Kolkata

2COMS Consulting Pvt. Ltd.; Kolkata District; On-site; INR 900,000 - 1,500,000; Full time

Job summary

2COMS Consulting Pvt. Ltd. in Kolkata is seeking a seasoned MERN Stack Developer to lead full-stack development of scalable web apps. You will drive frontend and backend architecture, API design, and data modeling while embedding AI/LLM features and automated testing using Playwright.

You will work across teams to ensure secure, performant solutions and provide guidance on best practices, CI/CD, and production deployments in a collaborative, fast-paced environment.

Qualifications

• 4–7 years of professional software development experience.
• Extensive hands-on experience with the MERN stack (MongoDB, Express.js, React, Node.js).
• Mastery of React architecture (hooks, state management) and Node.js/Express capabilities.
• Experience implementing automated testing with Playwright.
• Experience building automation workflows and API integrations using n8n.
• Familiarity with AI/LLM API integration, prompt engineering, and AI-assisted coding.
• Understanding of Git/GitHub/GitLab, CI/CD, deployments, and production environment management.
• Strong problem-solving, ownership, communication, and code quality.

Responsibilities

• Design, build, and maintain scalable web apps using MERN, REST and GraphQL APIs.
• Develop backend services with Node.js/Express and robust data models in MongoDB.
• Integrate third-party APIs, webhooks, and payment systems for seamless workflows.
• Implement end-to-end and functional testing with Playwright.
• Create AI-driven features by integrating AI/LLM APIs and tooling.
• Mentor juniors and collaborate with QA, UI/UX, Product, and DevOps teams.

Skills

MERN stack

React

Node.js

Express

MongoDB

Playwright

n8n

AI/LLM integration

Git

CI/CD

API integration

Webhooks

OpenAI / LLM platforms

Next.js

Tools

Playwright

n8n

Git

Docker

AWS

Redis

Bull/BullMQ

OpenAI/Large Language Models

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.