Mern Stack Developer

Senior MERN Stack Developer

Location: Mumbai (Hybrid)

Experience: 3-5 years

Hiring Urgency: Immediate

Job Title: MERN Stack Developer (3+ Years Experience)

Role Overview

We are looking for a hands-on MERN Stack Developer with around 3 years of experience to build scalable, secure, and high-performance web applications. You will work closely with product, AI, and data teams to develop real-time features, APIs, and data-driven workflows critical to financial due diligence. This role demands strong backend fundamentals, experience with WebSockets, and a solid understanding of both NoSQL and relational databases.

Key Responsibilities

Backend & API Development

• Design and develop secure, scalable, and high-performance REST APIs
• Implement authentication, authorization, and role-based access control (RBAC)
• Build real-time features using WebSockets (live updates, notifications, collaboration)
• Ensure APIs meet performance, reliability, and security best practices
  
  

• Develop responsive and intuitive user interfaces using React.js
• Collaborate with UX/product teams to translate requirements into clean UI components
• Optimize frontend performance for large datasets and real-time interactions
  
  

• Design and manage data models using:
• NoSQL databases (MongoDB)
• Relational databases (PostgreSQL / MySQL)
• Write optimized queries and ensure data consistency, indexing, and scalability
• Handle transactional and analytical data use cases effectively
  
  

• Participate in system design discussions and technical decision-making
• Write clean, modular, and testable code
• Collaborate with cross-functional teams including AI, product, and DevOps
• Debug production issues and improve system reliability
  
  

• ~3 years of experience in MERN Stack development
• Strong proficiency in:
• Node.js & Express.js
• React.js
• JavaScript / TypeScript
• Hands-on experience with WebSockets (Socket.io or similar)
• Experience building secure APIs (JWT, OAuth, encryption, rate limiting)
• Strong understanding of:
• MongoDB (schema design, indexing)
• Relational DBs (PostgreSQL/MySQL, joins, transactions)
• Familiarity with Git-based workflows and code reviews
  
  

• Good understanding of:
• API performance optimization
• Asynchronous programming
• Error handling and logging
• Security best practices (OWASP basics)
  
  

• Experience with AWS cloud services, especially:
• EC2
• ECS
• EKS
• Exposure to Docker & containerized deployments
• Experience with CI/CD pipelines
• Knowledge of system scalability, caching (Redis), and message queues
• Prior experience in FinTech / SaaS / Data-heavy platforms
  
  

• Product-first mindset with attention to performance and security
• Ability to work in fast-moving startup environments
• Strong problem-solving and debugging skills
• Ownership mentality — you build it, you improve it, you scale it
  
  

• Opportunity to build a core AI-driven FinTech product
• Real ownership over architecture and critical features
• Exposure to scalable systems and real-time applications
• Collaborative culture with high engineering standards