Jauhen V.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.

Specialist in mobile Android apps development and team management having about 16 years of work experience in the IT industry ⚡️ Strong experience with: 📍 Kotlin (6 years), Java (16 years), 📍 IDE: Android Studio 📍 Development methodologies: Scrum, Kanban, Custom, 📍 VCS: Git, Svn, 📍 Build Automation System: Gradle ✂️ Determining the duties and responsibilities of individuals in a team, ✂️ Training new team members, ✂️ Designing application architecture (Basic mobile architectural patterns: MVVM, MVC, MVP), ✂️ Application development from scratch, ✂️ Participating in all sorts of agile ceremonies (user story grooming, sprint planning, sprint retrospective, daily stand-up), ✂️ Intermodular interaction design, ✂️ Refactoring and code review, ✂️ Clean architecture, ✂️ Working with peripheral interfaces for data transferring: ✂️ Bluetooth 2.0, Bluetooth low energy (BLE), Audio Jack, USB, ✂️ Participating in big global (e.g., Official app for Sochi 2014 Olympic Winter Games) and local (e.g., S7 Airlines Official Application) projects as senior mobile developer and team leader, 12) JNI (Java Native Interface) and NDK (Native Development Kit) 🛠 Skills & Technologies: Android / Kotlin: Kotlin 2, Coroutines, Flow, Jetpack Compose, Material 3, Navigation, ViewModel, Lifecycle, Paging 3, WorkManager, DataStore, Room Architecture: MVVM / MVI, modularization, Clean Architecture, Hilt, KSP Network & data: Retrofit, OkHttp, Kotlinx Serialization, Firebase (Analytics, Crashlytics, Remote Config, FCM, Performance) Monetization & growth: Play Billing, AdMob / mediation (AppLovin, ironSource), Adjust / AppsFlyer, Play Integrity, UMP Build & quality: Gradle KTS, Version Catalogs, R8, AAB, Baseline Profiles, JUnit, MockK, Compose tests, CI UI / extra: Coil, Lottie, Glance, Media3, CameraX, Wear OS / Android TV — только то, что правда было Tools: Jira, Figma, Charles / Proxyman, Postman, Slack Also worked with (legacy): XML Views, RxJava, Dagger 2, Glide, Cicerone, JNI/NDK, Maps, Payments, BLE