ProGuard
Spicy — senior dev territoryFrontend
ELI5 — The Vibe Check
ProGuard is Android's code shrinker that removes unused code, renames everything to single letters, and makes your APK smaller. It's like packing for a trip by throwing away everything you don't absolutely need, then disguising what's left.
Real Talk
A Java bytecode optimizer and obfuscator used in Android development (now superseded by R8). ProGuard shrinks code by removing unused classes/methods, optimizes bytecode, and obfuscates by renaming identifiers to short meaningless names, reducing APK size and making reverse engineering harder.
When You'll Hear This
"Enable ProGuard for release builds — it'll shrink the APK by 30%." / "ProGuard rules are tricky — keep rules for reflection-based libraries or they'll break at runtime."