Sr. MERN Stack Developer

Excellis IT Pvt. Ltd.; Kolkata District; On-site; INR 700,000 - 1,100,000; Full time

Job summary

Excellis IT is hiring a Sr. MERN Stack Developer in Kolkata for a hands-on role requiring 3–4 years of professional MERN experience. You will design and maintain scalable web applications using MongoDB, Express.js, React.js, and Node.js, collaborating with product teams to deliver robust solutions.

You will work on API design, database optimization, and CI/CD deployments, with exposure to cloud platforms and containerization. On-site Kolkata location.

Qualifications

• 3-4 years of professional MERN stack development experience.
• Experience with MongoDB schema design, aggregation, indexing, and performance tuning.
• Hands-on React.js experience with hooks, state management, and routing.
• Proficiency with Git and modern version-control workflows.
• Familiarity with unit testing frameworks (Jest, Mocha) and frontend testing tools.

Responsibilities

• Full-Stack development using the MERN stack to design, build, and maintain scalable web apps.
• Design, build, and consume RESTful APIs; integrate third-party services as needed.
• Model and optimize MongoDB schemas; ensure data integrity and performance.
• Write clean, modular code; develop unit and end-to-end tests; participate in code reviews.
• Collaborate with product managers and designers; document architecture decisions and API contracts.

Skills

MongoDB

React.js

HTML/CSS

Git

Testing

Tools

Docker

Kubernetes

AWS

CI/CD (Jenkins)

GraphQL

Job description

This is a place to grow, learn and connect. Everything that makes you who you are is welcome here.

Sr. MERN Stack Developer

Experience: 3–4years of professional work experience specifically in MERN stack development.

Technical Skills:

• · MongoDB: Proficient in schema design,aggregation pipelines, indexing, and performance tuning.
• · React.js: Hands-on experience with componentlifecycle, hooks (useState, useEffect, etc.), state management (Context API,Redux, or similar), and routing (React Router).
• · HTML/CSS: Expertise in semantic HTML5, CSS3,Flexbox/Grid, and preprocessors (SASS/LESS) or CSS-in-JS libraries (StyledComponents, Emotion).
• · Version Control: Proficient with Git, branchingstrategies, and pull-request workflows.
• · Testing: Familiarity with unit testingframeworks (Jest, Mocha) and frontend testing tools (React Testing Library,Enzyme).

Soft Skills:

• · Strong problem-solving abilities and debuggingskills.
• · Excellent written and verbal communication; ableto articulate technical concepts clearly.
• · Ability to work independently andcollaboratively in an agile/scrum environment.

PreferredQualifications:

• · Experience with cloud platforms such as AWS(EC2, S3, Lambda), Azure, or Google Cloud.
• · Familiarity with containerization technologies(Docker, Kubernetes).
• · Knowledge of continuous integration andcontinuous deployment (CI/CD) tools (Jenkins, GitLab CI/CD, CircleCI).
• · Understanding of web security principles (OWASPTop 10, JWT, OAuth2).
• · Exposure to GraphQL, Next.js, or other modernframeworks.
• · Prior experience with microservices orserverless architectures.

Description

We are hiring for Mern Stack profile.

Location- Kolkata (On-site)

About the Role

We are seeking a skilled MERN Stack Developer with 3–4 yearsof hands-on experience to join our engineering team. In this role, you will beresponsible for developing and maintaining scalable web applications usingMongoDB, Express.js, React.js, and Node.js. You will collaborate closely withproduct managers, UX/UI designers, and other developers to deliver high-qualitysolutions that meet business requirements.

Key Responsibilities

• · Full-Stack Development: Design, develop, andmaintain web applications using the MERN stack.
• · API Design & Integration: Build and consumeRESTful APIs with Node.js and Express.js; integrate third-party services asrequired.
• · Database Management: Model, query, and optimizeMongoDB schemas; ensure data integrity, indexing, and efficient queryperformance.
• · Code Quality & Testing: Write clean,modular, and reusable code; develop unit tests (e.g., Jest, Mocha) andend-to-end tests; participate in code reviews.
• · Collaboration & Documentation: Work closelywith cross-functional teams; document architecture decisions, API contracts,and setup processes.
• · Deployment & Scaling: Assist with CI/CDpipelines, containerization (Docker), and cloud deployments (AWS, Azure, orsimilar). Monitor application performance and recommend improvements.
• · Troubleshooting & Support: Diagnose andresolve production issues in a timely manner; participate in on-call rotationsif required.