Justin Lee
Incoming Software Engineer Intern at Cactus (YC S25)
San Diego, California, United States
Summary
👤
Senior🎓
Top SchoolJustin Lee is an applied AI engineer with 12 years of hands-on experience building ML systems and production services, currently working on edge transformer optimization and set to intern at OpenAI. He has driven measurable gains in academic and product settings—boosting a text-to-SQL agent by 267% on a Spider2-snow benchmark, improving LLM explanation methods presented at NeurIPS, and increasing user engagement by 25% through TTS and summarization features. Justin’s background spans AI research, backend engineering, and embedded security, with practical wins like multiprocessing and load-balancing deployments for YC-backed startups and recognized contributions to BearSSL debugging. Based in San Diego, he blends research rigor with product-first execution, often connecting retrieval/RAG, prompt tuning, and efficient inference to ship scalable solutions. Unusually for an engineer at his level, he’s also an active electronic music producer, bringing a creative sensibility to system design and experimentation.
12 years of coding experience
1 year of employment as a software developer
Mt. Carmel High SchoolUniversity of California, Los AngelesGithub contributions (5)
justinhlee/emotional-analysis
Jan 2015 - Feb 2015
Contributions:23 commits, 27 pushes in 1 month
justinhlee/What-would-they-say-
Mar 2014 - Sep 2014
Contributions:4 commits, 4 pushes in 6 months
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