Testsigma

Full Stack Developer Intern (MERN)

InternshipIn OfficeMohali, Punjab6 months11K/mo1 openingImmediate / Rolling

About this internship

Join Testsigma in Mohali as a Full Stack Developer Intern (MERN). This entry-level internship is built for candidates eager to turn classroom knowledge into hands-on experience across the frontend, backend and database of a live product. As a Full Stack Developer Intern (MERN), you will work…

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Skills you'll use

ReactNode.jsExpress.jsMongoDBJavaScriptREST APIsGitHTML/CSS

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 React, Node.js, Express.js, MongoDB
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 Mohali, Punjab (or open to remote where applicable)

Perks & benefits

Real-world full-stack project experiencePre-Placement Offer (PPO) opportunityFlexible working hoursStipendExposure to production engineering practicesInternship Certificate

Interview & selection process

4 rounds — typical selection flow for this role:

1Online Application Screening — the recruitment team at Testsigma reviews your resume, projects and GitHub/portfolio for fit with a full-stack developer internship in Mohali.
2Online Coding / Technical Assessment — a timed test covering programming fundamentals, data structures, problem solving and basic React/Node.js/Express.js 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 (MongoDB, Express, React, Node.js).
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 Testsigma.

About Testsigma

Testsigma operates in the developer tools (saas) space and actively invests in early-career engineers, including at its Mohali technology team. Its culture is practical and learning-oriented — mentorship, honest code reviews and real project work are part of everyday life, and interns are treated…

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