Siarhei 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.

• Experience: 10+ years in Android Development, 5+ years in Test Automation. • Industry Sectors: e-commerce, IPTV & VOD, IM & VoIP, puzzle games, ads, ticketing, RMM. • Methodology: Waterfall, Agile (Scrum, Kanban). • Good team player willing to reach a consensus on contentious issues. • Background in providing technical guidance and assistance to less experienced team members. • Ability to adapt easily to new environments and react quickly to new challenges. Programming Languages • Solid experience in Java and Kotlin. • Some experience in JavaScript ES5 (iOS UiAutomation) and ES6 (React Native). • Basic experience in C/C++, Groovy, Python. Languages, formats, protocols • HTTP/S, REST, WebSocket • JSON, XML, XPath, XSLT, HTML, RegExp • UML (PlantUML) Android Tools & Libraries • Android SDK, AndroidX/AppCompat, Android KTX • Custom View/ViewGroup, Jetpack Compose • View Animation API, Object Animator API • ButterKnife, Jetpack Data/View Binding • Material Design 2/3, Play Billing • Biometric API, Location API, Google Maps API • Light/Dark mode (DayNight theme), Dynamic Color (Material You) • Edge-to-edge content, phone/tablet UI (master-detail UI) • SQLite, SQLCipher, Realm, DBFlow, Room (DB ORM) • Dagger2, Hilt (DI frameworks) • OkHttp, Retrofit, Gson (HTTP/S networking) • EventBus, RxJava2, Kotlin Coroutines, Flow (async programming) • Picasso, Glide (image loading) • Crashlytics, Flurry, Firebase (analytics SDK) • Appodeal, MoPub (Ad SDK) • Configure app building process with Gradle • MVP, MVVM, Clean Architecture, Single Activity (app architecture) • JadX, apktool, smali/baksmali (reverse engineering) IDE • Eclipse, IntelliJ IDEA, Android Studio, Visual Studio Code QA Tools, Unit & Automated Testing • JUnit, TestNG, Log4j • Selenium WebDriver, HtmlElements • Appium, AndroidDriver, iWebDriver • Xcode Instruments (UiAutomation) • HP QTP (VBScript) • bugDB, Oracle Test Manager, Zephyr for JIRA Source Control Systems • Git (GitHub, Bitbucket, GitLab, Gerrit), Perforce Building Tools & Dependency Managers • Apache Ant, Maven, Gradle Project Management & Issue Tracking System • JIRA