Software engineer, Ho Chi Minh City
HOANGLE
I design the testing systems that decide what merges. Six years of React and TypeScript in production.
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
1,325
weekly downloads
npm registry, fetched at build time
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, and I am the support inbox.
1,489
lesson templates
counted from the template files in the product repository, August 2026
giaoanai.comopen for signup
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.
1,325
weekly downloads
npm registry, fetched at build time
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 software 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.