Most Android developers rely on out-of-the-box tools like Firebase Performance or Sentry — but what if you want full control over what you measure and where you send it?

In this talk, I’ll show you how to build a lightweight performance tracking library that can:

Track custom app and screen-level metrics (e.g. startup, navigation, image loading)

Start and stop traces with clear lifecycle hooks

Report metrics to multiple destinations — Firebase Performance, Sentry, or your own SDK

We’ll cover:

How to define flexible PerformanceTrace objects

Where to hook them in the Android lifecycle (Activity, Fragment, Compose)

How to route data to third-party tools using clean abstraction layers

Whether you're working in a startup or a large app team, this approach gives you full observability with minimal overhead. You’ll walk away with code samples, architectural patterns, and a reusable tracker you can plug into your app today.