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Open Source Contributor – Java at Mercor

posted 20 days ago
mercor.com Part Time remote 50-85/hr 95 views

Open Source Java Contributor | $50–85/hr | Worldwide Remote

Mercor is looking for experienced Java developers with a strong open-source background to join a global network of engineers contributing to AI, data, and enterprise software infrastructure projects. This is a part-time contract role (10–20 hrs/week) ideal for backend specialists who thrive in collaborative, high-impact environments.

Key Responsibilities

  • Design challenging coding problems with clear input/output specifications, constraints, and explicit function signatures.
  • Develop complete mini-repositories including problem statements, reference solutions, comprehensive unit tests (10–20 cases), and executable test runners.
  • Implement clean, production-quality code aligned strictly with test expectations.
  • Write high-coverage tests addressing edge cases, invalid inputs, and performance constraints.
  • Ensure full executability with no missing dependencies or signature mismatches.

Requirements

  • 3–6 years of backend development experience in Java.
  • Hands-on experience with Spring Boot, Spring Framework, Micronaut, or Quarkus.
  • Proven experience building and maintaining RESTful APIs.
  • Working knowledge of microservices architecture.
  • Experience with databases: PostgreSQL, MySQL, or MongoDB.
  • Proficiency writing unit tests using JUnit and Mockito.
  • Familiarity with Docker and CI/CD workflows (GitHub Actions or similar).
  • Strong understanding of clean code principles, modular design, and code reviews.
  • Comfortable with Git-based collaboration including PRs, issues, and reviews.

Role Details

  • Part-time / Contract: 10–20 hours per week.
  • High-impact contributions to globally visible, open-source projects.
  • Competitive hourly rate: $50–$85/hr based on experience.

How to apply for this role
  • Upload your resume — keep it up-to-date and in English. Mercor will auto-fill your profile from it.
  • Complete the AI interview — a 15-minute conversation about your experience. Be ready to discuss specific projects and challenges you've solved.
  • Submit your application — only about 20% of applicants finish all the steps, so completing yours puts you well ahead.
Benture is an independent job board and is not affiliated with Mercor.

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