Most Android books teach APIs. This one teaches how to scale.

Why this book

This is not a catalog of libraries. It is a practical guide for when your codebase grows, releases accelerate, and the UI starts failing under pressure.

• Composable API design that survives refactors
• Stability and performance: what matters, what does not
• Scale tactics: modularization, build time, CI quality gates

Who it is for

Android developers who already know the basics and want production-grade thinking: tradeoffs, constraints, debugging workflows, and maintainability at scale.

Who Am I

Hello! I'm Fabio, and I'll try to give you a little background on myself and what led me to write this book.

This book did not come from a single role, a single project, or a single point of view. It grew out of years (12+) spent moving across systems, contexts, and constraints, trying to understand why things work when they work, and why they fail when they fail.

Over the years I have worked across very different domains: large-scale consumer apps like Smart Launcher and Nova Launcher (Branch.io), academic research with the University in Italy and partners in Norway, and mission-critical environments such as banking (UniCredit Bank). I have also collaborated with private security organizations and built SaaS products, from advanced shift scheduling to workflow systems for accounting firms, where reliability and maintainability are non-negotiable.

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Chapters you'll find

A production-focused roadmap, from fundamentals to scale:

1. The Person Behind This Book
2. Introduction
3. So you think you know Android?
4. The Compose Illusion: Everything Works, Until It Doesn’t
5. Latency Is a Feature. And It’s Usually Your Fault!
6. Architecture is Negotiation
7. Everything Scales Until it Doesn’t
8. Bad Workflow, Good Bugs
9. Observability Is a Feature, Not a Debugging Tool
10. Teaching Your Repository to Think
11. From Android to KMM: Sharing Code Without Sharing Pain
12. Extra: Compose at Scale