Mu Sigma

MERN Stack Developer Intern

InternshipIn OfficeGurugram, Haryana5 months36K/mo3 openingsImmediate / Rolling

About this internship

Mu Sigma has an open MERN Stack Developer Intern position for its Gurugram technology team for motivated freshers and final-year students. You will own meaningful full-stack work and grow the exact skills product teams hire for. As a MERN Stack Developer Intern, you will work alongside experienced…

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Skills you'll use

MongoDBExpress.jsReactNode.jsReduxREST APIsJavaScriptGit

What you'll do

Build responsive, accessible user interfaces and reusable frontend components
Design and implement REST/GraphQL APIs and server-side business logic
Model data and write efficient queries against SQL/NoSQL databases
Integrate frontend and backend and ship features end to end
Write clean, tested code, fix bugs and act on code-review feedback
Participate in daily stand-ups, sprint planning and demos

Who can apply

Pursuing or recently completed BE/B.Tech/BCA/MCA/M.Tech or equivalent (strong coding fundamentals, any branch)
Foundational knowledge of MongoDB, Express.js, React, Node.js
Understanding of data structures, OOP and basic databases (SQL/NoSQL)
Familiarity with Git and a willingness to learn modern full-stack workflows
Good communication, problem-solving skills and a genuine willingness to learn
Based in or open to relocating to Gurugram, Haryana (or open to remote where applicable)

Perks & benefits

StipendExposure to production engineering practicesInternship CertificateLetter of RecommendationMentorship from senior engineersReal-world full-stack project experience

Interview & selection process

4 rounds — typical selection flow for this role:

1Online Application Screening — the recruitment team at Mu Sigma reviews your resume, projects and GitHub/portfolio for fit with a full-stack developer internship in Gurugram.
2Online Coding / Technical Assessment — a timed test covering programming fundamentals, data structures, problem solving and basic MongoDB/Express.js/React questions.
3Technical Interview — a live discussion of your projects and a hands-on coding/full-stack round (frontend + backend + database concepts) on the MERN stack with Redux state management.
4Second Technical / System Design Round — deeper full-stack problem solving, API design, database modelling and code walkthrough with a senior engineer.
5HR / Managerial Discussion — a conversation about your interests, availability, learning goals and the internship offer with Mu Sigma.

About Mu Sigma

Mu Sigma is a data analytics organisation with a growing engineering presence in Gurugram and a track record of hiring and developing young software talent. The team believes the best way to grow engineers is by doing, so interns are given real ownership of full-stack work from the start. Working…

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