Alex S.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Senior Android Developer (Kotlin/Java) with 8+ years of experience, specialized in FinTech and large-scale apps. I currently own Android development for a financial product with ~841K active users (30 days) and 99.9% crash-free users (Firebase). What I deliver: - Stable, scalable architecture (MVVM, Clean patterns, Coroutines/Flow, Koin) - Security-critical features: passkeys, encryption, root/jailbreak detection, secure token handling, device binding - Performance & stability improvements (Crashlytics/Firebase-driven debugging, ANR/crash triage) - Reliable delivery with CI pipelines, clean releases, and maintainable code Typical tasks I handle: - new feature development end-to-end - refactoring legacy Java/Kotlin into modern architecture - fixing hard crashes/ANRs (device-specific issues included) - SDK integrations (analytics, payments, push, security) - code reviews and mentoring / setting team standards (if needed) If you need someone who can take ownership, ship safely, and keep your app stable at scale — let’s talk.