
Jerry Zhang
Co-Founder/CEO at Lemma (YC F25) | Continuous Learning for AI Agents
zjearbear
San Francisco, CA
West Vancouver, British Columbia
Joined April 2026
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Summary
Jerry Zhang is a highly driven and entrepreneurial individual, co-founding Lemma (YC F25) to address the challenge of continuous learning for AI agents. His work at Lemma focuses on building an evaluation and observability platform that automatically optimizes prompts and agents based on real-world user feedback and production data. This endeavor stems from his direct experience as an AI engineer, witnessing firsthand the degradation of AI agent performance in production environments and the manual effort required for debugging. nitter+6
His entrepreneurial journey began early, exemplified by Clinicode, a freshman AI medical coding startup he co-founded. While Clinicode ultimately failed due to a lack of founder-market fit, Zhang gained valuable lessons on the importance of team dynamics and market understanding, which he applied to the successful founding of Lemma. This experience demonstrates his resilience and ability to learn from setbacks. leviathanencyclopedia+1
Zhang possesses a strong technical background in software engineering and AI, honed through internships at companies like ChipStack, Keepsake, and Utopia Labs. He has experience with various technologies including React, Node.js, Next.js, TypeScript, and MongoDB. His research as an Undergraduate Research Assistant at USC's AutoDrive Lab also showcases his expertise in autonomous driving systems and deep learning algorithms. ycombinator+1
Academically, Jerry Zhang is a high-achieving student. He graduated from Collingwood School with a 4.0 GPA and is pursuing a Bachelor's degree in Computer Science and Business Administration at the University of Southern California, where he is recognized as a Trustee Scholar and CURVE Scholar. His intellectual curiosity extends to research, as evidenced by his project on the impact of cryptocurrency and blockchain in developing countries. polygence+1
He has actively participated in and led student organizations at USC, including serving as a Developer and Director of Internal Community at LavaLab, where he helped develop the Lumen platform, and holding leadership roles as Director of External Affairs and Director of Recruiting at SEP at USC. These experiences highlight his leadership capabilities and commitment to community building within technical and entrepreneurial ecosystems. leviathanencyclopedia
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