Justyn Harriman
Member Of Technical Staff at OpenAI
San Francisco, California, United States
Summary
👤
Senior🎓
Top SchoolJustyn Harriman is a seasoned engineering leader and software engineer with 12 years of experience building large-scale, safety-critical systems and consumer-facing infrastructure. Currently on OpenAI’s Safety Engineering team, he previously founded and doubled Nextdoor’s Trust & Safety organization to combat fraud, misinformation, and election-related risks at scale. He designed and implemented platform-wide decisioning and rule engines processing hundreds of millions of events daily, an in-browser IDE for rapid rule deployment, and a rebuilt identity verification system that raised verification pass rates without increasing fraud. Hands-on across the stack, he has built OpenID Connect authentication, a localization pipeline for ten markets, and centralized Elasticsearch services for user content. Notably, his work balances product sensitivity and engineering rigor—creating pre-flight rule backtesting against over a billion events to make live safety changes auditable and low-risk. Based in San Francisco and grounded in a Computer Science degree from the University of Chicago, he thrives at the intersection of scalable systems, operational tooling, and policy-informed engineering.
12 years of coding experience
9 years of employment as a software developer
Bachelor of Science with General Honors Computer Science, Bachelor of Science with General Honors Computer Science at University of Chicago
Spanish
Github Skills (72)
python10
api-client10
testing10
performance-testing10
serverless10
rest-api10
api10
sdk10
lambda10
developer-tools10
continuous-integration10
aws-cloud10
aws-lambda10
benchmarking10
serverless-framework10
Programming languages (6)
Github contributions (5)
jharriman/CoolSignDb-Server-Client
Oct 2013 - Nov 2013
Contributions:29 commits in 1 month
Nextdoor/localstack
Apr 2018 - May 2018
💻 A fully functional local AWS cloud stack. Develop and test your cloud apps offline!
Contributions:46 commits, 38 PRs, 39 pushes in 1 month
aws-cloudserverlesscloudnodejsaws
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