MERN Stack Developer Intern

More than 9,000 organisations use our HR and payroll suite, from regional hospitals to school districts. We're looking for an MERN Stack Developer Intern. This internship suits a student who has already built a few websites and wants to work on a codebase with other people. The internship is fully remote. Interns join our Warsaw team on daily calls and get a named mentor. Core hours are 10:00 to 15:00 CET.

The work:

• Test forms and checkout flows before each release and log issues in Jira.
• Push code to GitHub through feature branches and pull requests.
• Build reusable UI components and add them to the shared component library.
• Keep a short daily log in Notion of what you worked on and where you got stuck.
• Check pages with Lighthouse and fix accessibility issues such as missing alt text and low contrast.

You should be:

• Undergraduates or recent graduates in IT, computer science, management or a related field.
• Own laptop and a reliable internet connection.
• Hands-on practice with React or Angular through projects or coursework.
• Currently pursuing B.Tech, BCA, MCA, BSCS or a related degree, graduating in 2027.
• Understanding of how APIs, JSON and HTTP status codes work.

4 months, starting Within 2 weeks. Stipend: $250 - $300 per month.

Perks: Letter of recommendation, Performance bonus, Certificate, Flexible work hours, Job offer on successful completion.

Applications are reviewed weekly.

Duration: 4 months. Start: Within 2 weeks.

Demo job created on 11jobs for testing and demonstrations. It is not an actual opening at Mainsail Labs sp. z o.o..