Henry Tsai
Lead Platform Engineer
Seattle, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolHenry Tsai is a Lead Platform Engineer based in Seattle with over 15 years of experience building large-scale cloud and identity systems, and nine years in senior engineering roles across major platforms. He led the TypeScript implementation and architecture of Microsoft's ION (Identity Overlay Network) and contributed to DIF Sidetree and Identity Hub specifications, blending deep decentralised identity expertise with production-grade platform engineering. At Microsoft he drove identity services and verifiable credential efforts, and now applies that background to platform leadership at Block. His open-source work on the ION repo shows hands-on backend engineering—Koa-based server logic, Sidetree integration, and Bitcoin service ties—demonstrating both protocol-level understanding and practical API design. Trained in software engineering and computer science at the University of Melbourne, he pairs research-rooted rigor with a history of shipping complex, security-sensitive systems.
9 years of coding experience
18 years of employment as a software developer
The University of Melbourne
Github Skills (11)
bitcoin10
javascript10
api10
bitcoins10
koa10
apidoc10
nodejs9
typescripts8
typescript8
typescript-types8
configuration-management7
Programming languages (6)
Github contributions (5)
decentralized-identity/ion
Apr 2019 - Jan 2023
The Identity Overlay Network (ION) is a DID Method implementation using the Sidetree protocol atop Bitcoin
Role in this project:
Backend Developer
Backend DeveloperContributions:15 releases, 47 reviews, 115 commits in 3 years 10 months
Contributions summary:Henry primarily focused on building the backend infrastructure for the ION node. Their work involved setting up the core server logic using Koa, implementing API endpoints, and integrating with Sidetree Core. The user demonstrated knowledge of request handling, response formatting, and integrating with services like Bitcoin. They also made some configuration changes and updated dependencies.
didoverlay-networksidetreemethodblockchain
TBD54566975/dwn-js
Sep 2022 - Feb 2023
Contributions:1 review, 8 commits, 1 PR in 4 months
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