Isaac Semaya
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolIsaac Semaya is a senior software engineer based in San Francisco with six years of experience building end-to-end systems that power high-volume financial and fraud workflows. He’s led cross-team migrations from monoliths to Kotlin, TypeScript, serverless Lambdas and GraphQL, preserving UX while cutting latency and operational overhead. Isaac pairs customer obsession with a culture of correctness—clear contracts, strong tests, and fast feedback loops—to drive reliable, auditable systems used by hundreds of thousands of merchants. He’s delivered measurable wins like a 90% query latency reduction, 20X faster ML model updates, and a 97% cut in feed traffic by rethinking data flows and rule propagation. Beyond product code he contributes to open-source tooling (notably improving certstrap for cross-platform revocation) and writes org-wide docs that reduced onboarding time by two-thirds. Outside work you’ll find him running, rollerblading, cycling or swing dancing in Golden Gate Park—an unexpectedly physical counterpoint to fighting latency and flaky tests.
6 years of coding experience
ScB Computer Science, ScB Computer Science at Brown UniversityHigh School Diploma, High School Diploma at The American School in London
English, Japanese, Spanish
Github Skills (13)
mtls10
bootstra10
go10
tls1210
certificate-authority10
bootstrap10
tls1310
libtls10
testing9
command-line-interface9
windows8
cicd7
crypto7
Programming languages (3)
Github contributions (5)
square/certstrap
Mar 2022 - Dec 2022
Tools to bootstrap CAs, certificate requests, and signed certificates.
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:3 reviews, 17 commits, 13 PRs in 9 months
Contributions summary:Isaac primarily contributed to improving the `certstrap` tool, focusing on cross-platform compatibility and enhancing the functionality of the `revoke` command. Their work included adapting the code to handle Windows-specific permission constraints, adding a passphrase flag for the `revoke` command, and integrating this command into the workflow tests. They also updated the Go version used by the project and removed debugging print statements.
golangcertificate-authoritysslsignedtls
isemaya-square/sharkey
Feb 2020 - Feb 2020
Sharkey is a service for managing certificates for use by OpenSSH
Contributions:6 pushes, 2 branches in 10 days
managing-certificatessslsecuritysshtls
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