Privacy-First Android Health Monitor

Built a native health app in 3 days - with zero Kotlin experience.

GitHub
KotlinJetpack ComposeCameraXSQLiteAndroid

A fully native Android health app built in 72 hours to fulfill an academic requirement under tight deadlines.

The Challenge

A junior developer needed a Kotlin/Java-based submission for his MS program, but lacked time to rebuild his Flutter prototype. The instructor rejected cross-platform code, forcing a native rewrite in 3 days.

Key Decisions & Tradeoffs

  • Learn-on-the-fly: picked up Jetpack Compose, CameraX, and Android media APIs through documentation and rapid prototyping.
  • Privacy-by-design: all data (video, audio, symptoms) stored locally with encrypted SQLite and secure file handling - no cloud, no telemetry.
  • Minimal viable scope: focused only on core features - facial heart rate analysis, respiratory audio capture, and symptom logging.

Outcome

Delivered a production-ready APK that passed academic evaluation, reinforcing that privacy doesn't require backend complexity.