Frontend engineer, Ho Chi Minh City
HOANGLE
Six years of React and TypeScript. I ship products people pay for, and build the testing infrastructure that keeps software honest.
37%
main bundle
GEN, before and after production builds, March and April 2026, gzip
1,489
lesson templates
counted from the template files in the product repository, August 2026
Now: Aepsy · Giáo Án AI · mcp-cassette
Product I run
Giáo Án AI
AI lesson plans for Vietnamese primary teachers, designed to replace the two to four hours of nightly paperwork teachers describe. I built the code, the pricing, and the funnel; when it opens, I am also the support inbox.
1,489
lesson templates
counted from the template files in the product repository, August 2026
giaoanai.comprivate beta
Open source
Testing infrastructure for the agent era: tools that prove software works before agents and users touch it.
mcp-cassette
Record a real MCP session once, replay it forever. Contract snapshots fail the PR that breaks your tools; a safety lint catches poisoned descriptions.
AuthStunt
A self-hosted test identity manager for end-to-end auth testing. Personas are stunt doubles for your real users: each holds a real mailbox behind a catch-all SMTP server that extracts the OTP and the links. One Go binary.
GitHubearly alpha
I'm a frontend engineer who ends up owning the whole problem: the interface, the build system under it, the tests that keep it honest, and, for my own products, the pricing page and the support inbox.