Engineering write-ups from the mobile and web products we build and run.https://fighttech.vn/enhttps://fighttech.vn/blog/hacknao-english-methods/https://fighttech.vn/blog/hacknao-english-methods/Hack Não English teaches 1500 words across iOS, Android, web, and macOS, with an AI pronunciation and grammar coach that runs entirely on the phone. Here are the learning methods and the cross-platform, on-device stack that powers them.Sat, 04 Jul 2026 00:00:00 GMThttps://fighttech.vn/blog/gobrain-techstack/https://fighttech.vn/blog/gobrain-techstack/How we ship a PixiJS puzzle game to iOS, Android, and the web from a single TypeScript codebase, with over-the-air updates that still reach iOS 12 devices.Sat, 04 Jul 2026 00:00:00 GMThttps://fighttech.vn/blog/profocus-techstack/https://fighttech.vn/blog/profocus-techstack/ProFocus turns a spare phone into a desk clock, focus timer, and WiFi photo frame. Supporting that means running on Android 4.3 and iOS 12, with no Firebase and no Play Services. Here is how.Sat, 04 Jul 2026 00:00:00 GMT