Building Android Development competency is accessible because you already understand Android-specific testing frameworks (Espresso appearing in > 10% Mobile QA), platform architecture, mobile lifecycles, and RESTful APIs. Your experience with Android Studio and testing approaches (JUnit) provides a foundation. The main new skills are development languages (Kotlin appearing in > 35% Android, Java), building features rather than testing them, and mobile architecture patterns (MVVM appearing in < 10% Android). Your deep understanding of how Android apps should behave, common failure points, and platform constraints makes development more intuitive - you've been on the quality side, now you build with quality in mind from the start.