Rex Liu
Rex Liu
Co-founder in AI Safety (YC) | Caltech. I'm interested in explo(r|it)ing the boundaries of technology.
Projects
Ideas brought to life. A look at the products, companies, and creative works built from the ground up.
General Analysis
Startup building security infrastructure for agentic AI: adversarial evaluation (red teaming), observability, guardrails, and defensive tooling for enterprise AI agents. Founded with Rez Havaei and Maximilian Li; YC-backed and raised a $10M seed round led by Altos Ventures.
GA Guard (GA Guard, GA Guard Lite, GA Guard Thinking)
Open-sourced adversarially-trained guardrail family for long-context moderation and agent traces (supporting up to 256k tokens). Public benchmarks and Hugging Face model/releases show strong F1/latency performance versus cloud providers. Widely downloaded (tens of thousands of downloads reported after launch).
Research projects at Caltech (Thomson Lab)
Worked on bio-inspired AI algorithms, retrieval-augmented generation frameworks, and systems for spatial genomics and drug discovery; contributed to published machine learning research and NeurIPS/ICLR papers.
Security Research / Bug Bounty work
Reported multiple accredited vulnerabilities across platforms (Airbnb, Vimeo, Amazon, etc.), contributing to offensive security and penetration testing experience that informs adversarial testing for AI systems.
In the Spotlight
A collection of articles, interviews, and viral content where achievements have been shared.
Recognitions
Formal validation from the top. A showcase of official awards, grants, and government acknowledgements.
General Analysis: $10M Seed Funding (lead: Altos Ventures)
2026-04-29Seed round led by Altos Ventures with participation from 645 Ventures, Menlo Ventures, and Y Combinator; recognized by BusinessWire, FinSMEs, and other outlets.
USA Computing Olympiad — Platinum Division
listed on LinkedIn (date not specified)Recognized as a Platinum division competitor in USACO; listed under LinkedIn honors/awards.
Peer-reviewed / conference publications (selected)
2023 - 2025Co-authored ML research (examples include work on efficient LLM composition and foundation models for genomics); publications and preprints listed on Google Scholar and personal site.
Work Experience
Key roles that defined the journey.
Co-Founder
2025 - PresentCo-founded an AI safety/security startup focused on red teaming, guardrails, observability, and enterprise tooling for agentic AI. Led product launches and open-source releases (GA Guard).
Research Engineering
2025Contributed to Gemini multimodality and agent-focused work as a research engineer.
Systems Engineering
2024 - 2025Worked on software for the Lunar Trailblazer spacecraft and related systems engineering tasks.
Research Associate
2023 - 2025Research in bio-inspired AI and computational biology, contributing to publications and lab projects in drug discovery and spatial genomics.
Security Researcher
2019 - 2024Reported and managed vulnerability disclosures across multiple platforms; experience in offensive security and penetration testing.
Bug Bounty Hunter
2019 - 2024Active in bug bounty programs and vulnerability research, contributing to security expertise used for adversarial AI testing.
Research Assistant
2020 - 2023Research assistant in systems biology and tropical medicine projects; early research experience bridging biology and computation.
Membership
Affiliations and memberships in prestigious organizations and communities.
General Analysis is YC-backed per company and press materials; LinkedIn headline indicates YC affiliation for the co-founder team.
Active member of Caltech's computational biology and ML research group.
Education
Academic foundation and learning journey.
California Institute of Technology (Caltech)
Enrolled (undergraduate) - 2023 - Present (per LinkedIn)Bachelor of Science (BS), Computer Science & Biology
Undergraduate studies combining CS and biology; involved in research projects under Professor Matt Thomson's lab.
Taipei American School
Graduated (date not specified)High School Diploma
High school education with leadership in robotics (FIRST, VEX), CS team president, TEDx organizer, and other activities.
Socials
Connect and explore.