Open Source Contributor – Rust

Mercor is seeking experienced Rust developers with a proven record of open-source contributions to join a high-quality, global network of engineers supporting AI, data, and high-performance infrastructure projects.

This opportunity is designed for developers who are deeply engaged in the open-source ecosystem and have a passion for systems programming, performance, safety, and reliability.

Key Responsibilities

• Design challenging coding problems with clear input/output specs, constraints, and explicit function signatures.

• Develop complete mini-repos, including:

  • Problem statement

  • Reference solution

  • Comprehensive unit tests (10–20 cases)

  • Executable test runner

• Implement clean, production-quality Rust code aligned strictly with test expectations.

• Write high-coverage tests covering edge cases, invalid inputs, concurrency issues, and performance constraints.

• Ensure full executability with no missing dependencies, borrow checker violations, or build configuration issues.

Requirements

• 3–6 years of professional software development experience, with strong experience in Rust

• Strong proficiency in Rust fundamentals, including ownership, borrowing, lifetimes, and trait-based design

• Experience building backend services using frameworks such as Actix Web, Axum, Rocket, or similar

• Working knowledge of async programming (Tokio, async/await)

• Experience with databases: PostgreSQL / MySQL / MongoDB

• Experience writing unit and integration tests using Rust’s built-in testing framework

• Familiarity with Cargo, Docker, and basic CI/CD workflows (GitHub Actions or similar)

• Strong understanding of memory safety, concurrency models, and performance optimisation

• Comfortable working with Git-based collaboration (PRs, issues, reviews)

Role Details

• High-impact contributions to globally visible infrastructure and systems projects

• Part-time / Contract (10–20 hours per week)

We consider all qualified applicants without regard to legally protected characteristics and provide reasonable accommodations upon request.

Contract and Payment Terms

• You will be engaged as an independent contractor.
• This is a fully remote role that can be completed on your own schedule.
• Projects can be extended, shortened, or concluded early depending on needs and performance.
• Your work at Mercor will not involve access to confidential or proprietary information from any employer, client, or institution.
• Payments are weekly on Stripe or Wise based on services rendered.
• Please note: We are unable to support H1-B or STEM OPT candidates at this time.

About Mercor

Mercor partners with leading AI labs and enterprises to train frontier models using human expertise. You will work on projects that focus on training and enhancing AI systems. You will be paid competitively, collaborate with leading researchers, and help shape the next generation of AI systems in your area of expertise.