Jacob Lee
Founding Software Engineer at LangChain
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolJacob Lee is a founding software engineer and startup CTO with a decade of experience designing scalable systems from first principles and shipping production-ready developer tools. Based in San Francisco, he co-founded Autocode and now helps developers build with LLMs at LangChain, blending hands-on engineering with product and team leadership under uncertainty. His open-source contributions span backend, DevOps, and frontend work across notable projects like LangChain.js and LangGraph, where he restructured core dependencies and improved developer UX. Equally comfortable in CI, build systems, and API gateways, he pairs rigorous test automation with pragmatic architecture decisions. Passionate about developer communities and AGI, he brings an engineer-founder sensibility that favors clean abstractions and rapid iteration.
10 years of coding experience
8 years of employment as a software developer
A.B. Computer Science, A.B. Computer Science at Princeton University
German
Stackoverflow
86reputation
431reached
3answers
0questions
Github Skills (36)
asynchronous10
dependency-management10
javascript10
python10
apidoc10
async10
testing10
command-line-interface10
typescript10
build-system10
nextjs10
mochajs10
api10
typescript-types10
command-line10
Programming languages (9)
Github contributions (5)
langchain-ai/langchainjs
Mar 2023 - Mar 2023
🦜🔗 Build context-aware reasoning applications 🦜🔗
Role in this project:
Backend & DevOps Engineer
Backend & DevOps EngineerContributions:183 releases, 2246 reviews, 1 commit in 1 day
Contributions summary:Jacob's commits primarily focused on the codebase's core restructuring and core dependency updates, with key changes centered on moving the codebase to `@langchain/core`. This includes extensive modifications to the codebase's internal architecture and build system to accommodate the new dependencies, as well as updating the codebase's build script. The contributions indicate a solid understanding of software project structure, dependency management, and build processes, which aligns with DevOps and backend skills.
langchain-ai/chat-langchain
Aug 2023 - Aug 2024
Role in this project:Front-end Developer
Front-end DeveloperContributions:17 reviews, 71 PRs, 66 pushes in 11 months
Contributions summary:Jacob primarily focused on front-end development, making significant changes to the user interface. Their contributions involved fixing style issues and updating the application's empty state. The user implemented features like inline citations and added Next.js backend functionality. They also made adjustments for mobile devices, improved the overall UI, and updated the model selector.
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