Android (Kotlin) + Linux-tooling developer — I build, test and ship real software from an Android phone. No laptop, no PC.

I develop entirely on an Android phone: a full Linux environment via Termux + proot (Debian), a persistent tmux workspace, and GitHub Actions as my build machine. Everything below was written, compiled, tested and released from that device.

Constraints force discipline — no desktop IDE means scripted, reproducible builds; a small CPU and tight RAM mean lean, deliberate code. I ship anyway.

word-clock-widget — Android home-screen widget that spells the time in words. The time-to-words engine is pure Kotlin with no Android imports, so all 71 unit tests run on a plain JVM in CI. Jetpack Glance, offline-first, no background service.

termux-workstation — how I turned an Android phone into a real dev box: tmux sessions that survive app restarts, a Debian userland via proot, shell tooling that pushes build results to the phone, and CI as the build machine. Docs + sanitized configs.

geronfir.github.io — portfolio with case studies for the projects above.

Kotlin · Android · Jetpack Compose / Glance · Python · Bash · Linux (Termux, proot) · Git · GitHub Actions · ESP32

Email · Portfolio · GitHub

_{Built from an Android phone. Yes, really.}