GitHub Contributor

About the Role

We are looking for senior-level engineers with a visible open-source track record to help train AI systems on real code. You will create reinforcement-learning environments from real repositories, with reproducible setups and reference solutions.

Key Responsibilities

Build tasks from real repositories that test whether an AI model can fix bugs, add features, refactor and improve performance.
For each task, provide a reproducible environment and a reference solution.
Investigate and resolve difficult defects and performance bottlenecks in varied code bases.
Refactor legacy code for clarity, efficiency and long-term reliability.
Write up your technical reasoning and code decisions to raise training-data quality.
Follow project guidelines, take part in calibration and review sessions, and incorporate feedback to keep quality consistent.

Who We're Looking For

Required Qualifications

A clear public record of open-source contributions (GitHub or GitLab profile).
3+ years of software engineering experience.
Strong skills in Python, Java, Rust, Go, C++ or TypeScript.
Experience with Git, Docker and automated testing.
Fluent written English.
Reliable, detail-oriented, and able to work independently and meet deadlines in a remote setting.

Preferred Qualifications

Project maintainer or core-contributor experience.
Experience with large or distributed code bases.
Code-review experience.

Rights, Confidentiality and Data Handling

Submit only work that you created yourself or that you have the right to share.
Do not submit material covered by an employer, client or third-party confidentiality agreement, or material you have no right to share.
Do not submit export-controlled, military or defence-related technical data.
Remove credentials, secrets and personal data from anything you submit.
Rex may ask for evidence of ownership or licence, may verify submissions, and may reject or remove any submission.

Legal and Compliance Notice

All content you submit must be lawful, and you must have the right to share it.
Do not submit confidential or proprietary material belonging to an employer, client or third party, or personal data without a lawful basis.
Rex may verify identity, credentials, ownership and licensing; may reject or remove any submission; and may report unlawful submissions to the relevant authorities.
Engagement and payment are subject to successful verification and to applicable sanctions, export-control, tax and employment laws.
The contractor agreement will set out ownership and licence terms for the work you deliver (to be confirmed by Rex Legal).

Compensation

USD $50–100 per hour, adjusted by country of residence.