Open Source Software Engineer

We’ve partnered with a YC-backed AI tooling startup to find an Open Source Software Engineer who’s passionate about building developer tools for the LLM era. The company is developing a widely adopted, open-source framework for evaluating LLM applications, which is already used by engineers at top companies such as Google, Amazon, and Databricks.

As part of a small and focused team, you’ll work on a high-impact library that’s shaping how the next generation of AI products gets evaluated and improved.

What You’ll Do

• Build new features that improve how developers evaluate LLM-powered applications.
• Contribute to the design, maintenance, and evolution of the open-source library
• Collaborate with the community—responding to issues, feature requests, and bug reports
• Work closely with users to improve the developer experience

You Might Be a Fit If You

• Love working on open-source projects and care about the developer experience
• Have strong experience with Python and software engineering best practices
• Have contributed to open-source libraries or maintained your own projects
• Enjoy startup environments and thrive in ambiguity

Bonus Points

• Prior work on evaluation, RAG workflows, or LLM-based applications
• Contributions to AI infra or tooling libraries used by other developers

About Us

Lexoga One helps early-stage and high-growth startups find exceptional engineering and AI talent. We work with some of the most ambitious teams in tech to help them scale by finding the right people, fast. Each role on Lexoga One is curated with deep insight into the team, tech, and impact.

Note: We’re hiring on behalf of a YC-backed AI startup. Selected candidates will receive company details in the next step.

Required Application Step

Required: While applying, please include links to open-source projects you’ve built or contributed to. Use these links as your response to the question: “What interests you about working at this company?”