I build fast, beautiful and reliable native Android apps with Kotlin and Jetpack Compose — from the first wireframe to a 4.8★ listing on Google Play.
I'm Andrey Kotsarenko, an Android Developer with 7+ years of experience shipping native apps used by millions of people. I specialise in Kotlin, Jetpack Compose and clean, modular architecture that keeps teams fast long after launch day.
I care about the details users feel but rarely notice: cold-start times under a second, smooth 120 Hz scrolling, offline-first data, accessibility, and animations that make an interface feel alive. On the engineering side I champion automated testing, CI/CD and code that the next developer will thank you for.
Based in Oswiecim, Poland, I work with product teams across Europe and North America — remote or hybrid.
My daily driver is modern Android: Kotlin-first, Compose-first, reactive with Coroutines and Flow, and wired together with Hilt. I design multi-module codebases that build fast and scale with the team.
I'm equally comfortable maintaining a decade-old View-based app and migrating it to Compose screen by screen, without stopping feature work. Performance profiling, memory-leak hunting and Baseline Profiles are part of my routine — not an afterthought.
Beyond code: release management in the Play Console, staged rollouts, crash monitoring with Crashlytics, and close collaboration with designers and backend engineers.
A budgeting and multi-currency wallet app built 100% in Jetpack Compose with an MVI architecture and offline-first sync.
Activity tracking app with a companion Wear OS tile, syncing through Health Connect and a shared Kotlin Multiplatform domain layer.
Customer and courier apps for a last-mile delivery startup, featuring live map tracking over WebSockets and smart route hints.
Focus on software engineering and mobile systems. Published first Android app on Google Play during studies.
Have an Android project, a Compose migration, or a performance problem that needs solving? Drop me a line — I usually reply within one business day.
Freelance, contract or full-time — let's talk about what you're building.