Description : 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.

Frontend Development :

- 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.

Database & Data Handling :

Design and manage data models using :

1. NoSQL databases (MongoDB).

2. Relational databases (PostgreSQL / MySQL).

- Write optimized queries and ensure data consistency, indexing, and scalability.

- Handle transactional and analytical data use cases effectively.

System Design & Collaboration :

- 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.

Required Skills & Experience :

Core Technical Skills :

- ~3 years of experience in MERN Stack development.

Strong proficiency in :

1. Node.js & Express.js.

2. React.js.

3. JavaScript / TypeScript.

- Hands-on experience with WebSockets (Socket.io or similar).

- Experience building secure APIs (JWT, OAuth, encryption, rate limiting).

Strong understanding of :

1. MongoDB (schema design, indexing).

2. Relational DBs (PostgreSQL/MySQL, joins, transactions).

- Familiarity with Git-based workflows and code reviews.

Engineering Fundamentals :

Good understanding of :

- API performance optimization.

- Asynchronous programming.

- Error handling and logging.

- Security best practices (OWASP basics).

Good to Have (Nice-to-Have Skills) :
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.

What We Look For :

- 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.

What Youll Get :

- 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.