Backend Developer – AI Trainer (Remote, Part‑time)

About the role

We are looking for experienced Backend Developers to act as AI Trainers on a project with a leading AI lab. The role is remote, part‑time and focuses on designing realistic software engineering tasks and evaluating peer submissions.

Key responsibilities

• Design and implement multi‑file coding tasks covering bug fixing, feature development, refactoring, and testing.
• Write clear natural‑language specifications and reference implementations.
• Develop and extend unit and integration test suites for each task.
• Review peer‑generated tasks for correctness, clarity, realism and provide actionable feedback.
• Identify edge cases, ambiguities and potential failure modes to ensure high‑quality deliverables.

Required profile

• Advanced professional written proficiency in English.
• 3–7 years of professional software engineering experience.
• Proven ability to debug and navigate large, multi‑file codebases.
• Experience with code reviews, refactoring and production migrations.
• Self‑managed schedule and ability to work on multiple vendor projects.

Required skills

• Strong proficiency in Python and JavaScript/TypeScript.
• Working knowledge of Java, C# or Go.
• Experience with testing frameworks such as pytest, Jest, JUnit, xUnit or Go testing.
• Backend or full‑stack development experience in production systems.

What we offer

• Project‑based consultancy with per‑project payment.
• Flexible schedule and remote work.
• Freedom to use your own tools and work for other vendors concurrently (subject to their policies).