Backend Development Intern

More than 9,000 organisations use our HR and payroll suite, from regional hospitals to school districts. We're looking for a Backend Development Intern. Our Platform team is five engineers working fully remote across two time zones. The intern picks up small backend tickets first and moves to bigger features once comfortable. You will intern remotely with our team in Warsaw. We have hosted remote interns from several countries before. Core hours are 10:00 to 15:00 CET.

You'll help with

• Fix bugs from the Jira backlog, starting with small, well-defined tickets.
• Write and test backend features in Python or Node.js under the guidance of a senior developer.
• Present a short demo of your work to the team every two weeks.
• Debug failing builds in the GitHub Actions pipeline and note what caused them.
• Add unit tests with pytest or Jest so new code does not lower coverage.

Requirements

• Own laptop and a reliable internet connection.
• Available for the full internship period.
• Basic understanding of data structures, OOP and how HTTP requests work.
• Comfortable writing simple SQL queries (SELECT, JOIN, GROUP BY)
• Own laptop with at least 8 GB RAM and a reliable internet connection.

3 months, starting Jan 2027. Stipend: LKR 110,000 - LKR 145,000 pcm.

Perks: Performance bonus, Laptop provided for the internship, 5 days a week.

Duration: 3 months. Start: Jan 2027.

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