Virtual Threads solves the cost of spinning up thousands of threads in the JVM. It doesn't solve the blocking problem when your code has synchronized blocks or blocking native calls. JEP 444 says so, but almost nobody reads it to the end.
Aug 11 2026 · 8′ · Tutorials · concurrencia · spring-boot
Compiler says OK. Runtime explodes anyway. Here are the 4 patterns where strict null checks isn't enough: assertion functions, untyped libraries, Prisma ORM, and JSON.parse — with real code from a Next.js/Prisma stack.
Jul 23 2026 · 8′ · Tutorials · Next.js · TypeScript
useEffect isn't broken — the mental model we teach with it is. I audited every useEffect in a React 19 codebase and found 4 concrete categories where it was an antipattern. Here are the patterns that replaced them: derived state, event handlers, use(), and Server Actions.
May 20 2026 · 7′ · Tutorials · React · TypeScript
navigator.clipboard.writeText looks trivial until your app silently breaks in production with zero visible error. I found 4 cases the docs never mention: insecure context, lost focus, revoked permissions on iOS, and React timing. Here are the real patterns with copyable code.
May 08 2026 · 8′ · Tutorials · React · TypeScript
After an autonomous agent nearly wiped my production database, I built a real guardrails layer. Here are the controls, the code, and the logs that saved my skin.
May 07 2026 · 6′ · Experiments · TypeScript · produccion
A HN post about tar on macOS made the rounds again this week. The standard answer is "use GNU tar." I went further: I reproduced the 3 scenarios that actually break production in my Railway pipeline and documented the exact fix I use.
May 04 2026 · 8′ · Tutorials · docker · devops
The Python ML ecosystem has a structural problem that Node and Rust solved years ago: the transitive dependency chain of a single ML library can exceed 200 entries, most without verifiable cryptographic signatures. I simulated the same vector against my own stack — and what I found is not reassuring
May 01 2026 · 8′ · Experiments · devops · produccion
Copy Fail hit #1 on Hacker News with 977 points. I reproduced it in my Next.js stack and found something the viral post never mentions: when the clipboard fails silently during a password or token copy, the user has no idea. That's not a UX bug. It's a human error vector with real consequences.
Apr 30 2026 · 8′ · Experiments · TypeScript · javascript
I built a public lab with reproducible benchmarks to measure TypeScript 7 native preview against TypeScript 6 on real repos. The results are interesting, but the more useful story isn't the speedup: it's understanding when it matters, what breaks during migration, and how to test it without exposing private code.
Apr 29 2026 · 6′ · Experiments · TypeScript · Performance
Architecture, real systems, product decisions and technical lessons. Everything reviewed with my own judgment before it ships.
206 articles published