Eugene Z.

🏆 𝐓𝐨𝐩-𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 (𝐓𝐨𝐩 7%) 🏆 𝟏𝟎𝟎% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 𝐒𝐜𝐨𝐫𝐞 Android Developer Kotlin and Swift IOS Developer focused on production-ready mobile products for B2B/B2C companies. I also build React Native Mobile applications when one shared codebase is the right technical choice. I cover Mobile app Development from architecture and UI to API integration, store release and support. Over 8+ years, I’ve worked on 80+ mobile apps with 2M+ downloads. 📊 Mobile track record ✔️ 8+ years in Mobile app Development ✔️ 80+ mobile app delivered - from scratch to product ✔️ 2M+ downloads across Mobile Kotlin app, Swift app, and React Native ✔️ 30+ five-star client reviews for Mobile app Development ✔️ Proved expert native Android, native iOS and React Native expertise for Mobile app ✔️ US, UK, EU and Australian clients ⚙️ Android side 8+ years - native and cross-platform mobile experience 50+ apps - delivery portfolio 2M+ downloads - Kotlin Mobile App Developer, Stack: Kotlin, Jetpack Compose, Coroutines, Flow, Room, WorkManager, Firebase Play Market - release and production support As an Android Developer Kotlin engineer, I build new Android apps, take over existing codebases and improve architecture, performance and stability. My kotlin developer work covers REST API integration, Google Maps, subscriptions, deep links, Bluetooth and background services. My android experience also includes BLE, location, Android TV, media and hardware integrations. I can join as an android developer on an existing android kotlin product or build a new android application. 🍏 iOS side 2M+ downloads - native Swift portfolio 30+ five-star reviews - Swift Mobile App Developer Stack: Swift, SwiftUI, UIKit, StoreKit, HealthKit App Store - release and production support As a Swift IOS Developer, I build ios app products with REST API, push notifications, analytics, maps and local storage. I can join as an ios developer to improve architecture, solve production issues or prepare an App Store release. My Swift IOS Developer experience covers healthcare, fitness, fintech, social, streaming, education and business products. My ios background also overlaps with ios game developer requirements. 📱 React Native side 2 platforms - one shared application layer 8+ years - Mobile app Development background Stack: React Native, TypeScript, Expo, Firebase, REST APIs Swift + android kotlin - native modules when required React Native Mobile is a strong option when ios and Android need to share product logic. I can build from scratch or continue an existing react native codebase with authentication, subscriptions, chat, maps, camera, push notifications and analytics. When platform-specific functionality is needed, I extend React Native Mobile with native modules. For web-connected products, I coordinate with a React Developer or Web Developer so react and mobile follow the same business logic. My Mobile app Development workflow starts with product scope, API, Figma and platform requirements. I define architecture, implement the mobile app, connect services, test and prepare releases. I also focus on mobile app design, permissions, error handling and native conventions. For larger products, I work with a Business Analyst, Full Stack Developer or full stack developer react node engineer. Some products also use react python services, so I keep backend APIs and mobile behavior aligned. I can join as a Mobile Developer on an existing product, as a mobile app developer on a new MVP, or as an Android Developer Kotlin or Swift IOS Developer when native development is the priority. I also work with teams that include a Flutter Developer, Web Developer, React Developer, Full Stack Developer or Business Analyst. If a company is comparing a Flutter Developer, React Native Mobile or bubble, I can help choose a realistic technical approach. 🚀 Delivery For a new product, Mobile app Development can be native or cross-platform depending on performance, integrations, roadmap and budget. Android may need an Android Developer Kotlin approach, Apple-focused products a Swift IOS Developer, while shared logic can make React Native Mobile the better choice. I can also take over an existing mobile app when the previous mobile app developer has left or the next release is blocked. This can include performance fixes, API changes, SDK updates, crashes and unfinished features. My mobile developer background covers 80+ delivered products, 2M+ downloads and 30+ five-star reviews. Whether the project needs kotlin, Swift, react native, a Flutter Developer or coordination with a Full Stack Developer, the goal stays the same - a maintainable product ready to grow. If you need an Android Developer Kotlin engineer, Swift IOS Developer, React Native Mobile specialist or experienced mobile app developer, I can take the product from technical planning through release and support. 📩 Let’s build something great.