Senior Open Source Maintainer (Remote) & Core Contributor

Synthires; United States; Remote; USD 170,000 - 243,000; Full time

Job summary

Cincinnatus LLC is seeking an Open Source Maintainer / Core Contributor - Software Engineer for a remote, hourly contract. The role involves creating realistic engineering tasks for AI evaluation, reviewing AI-generated code, and running projects locally with Docker.

You will review and shape tasks in a mature open-source codebase, provide feedback, and collaborate with experts to ensure high-quality training data. The engagement requires 30-40 hours per week during weekdays.

Qualifications

• Maintainer: Listed in MAINTAINERS or CODEOWNERS, or completed at least 10 PR reviews in the last 12 months.
• Core contributor: At least 3 substantive merged PRs in the last 12 months.
• Experience contributing to a repository that is at least 2 years old, actively maintained, has real users, and follows an established code review process.
• Verifiable history of sustained open-source contributions through your GitHub account.
• Senior-level code review skills and ability to assess AI-generated code, tests, and edge cases.
• Hands-on experience building and testing projects locally, including with Docker.
• Strong written communication and technical reasoning skills.
• Ability to personally write clear technical feedback and evaluation rationales.

Responsibilities

• Develop realistic engineering tasks based on an open-source project you know well, including features, refactoring, and bug fixes.
• Create accurate reference solutions and evaluation materials.
• Review AI-generated code, tests, and grading rubrics against repository architecture and quality standards.
• Build, run, and test projects locally, including using Docker.
• Provide detailed technical feedback and explain the strengths and weaknesses of AI-generated solutions.
• Collaborate with subject matter experts to maintain consistent and accurate training data.

Skills

Maintainer status

Core contributor

Code review

Docker proficiency

GitHub usage

Tools

Docker

Job description

Cincinnatus LLC is seeking an Open Source Maintainer / Core Contributor - Software Engineer for a remote, hourly contract. The role involves creating realistic engineering tasks for AI evaluation, reviewing AI-generated code, and running projects locally with Docker.

You will review and shape tasks in a mature open-source codebase, provide feedback, and collaborate with experts to ensure high-quality training data. The engagement requires 30-40 hours per week during weekdays.