I am a Mobile App Developer specializing in React Native for iOS and Android platforms. With a strong background in native Android and iOS development using Kotlin, Java, and Swift, I bring comprehensive expertise to creating and maintaining mobile applications. My experience spans building offline-first web3 crypto wallet apps, smart home apps, and other industry-specific applications, working collaboratively with global teams and deploying projects to both App Store and Google Play. My passion lies in crafting seamless user experiences through modern technologies like React Native, Expo, and native modules, alongside continuous learning and contributing to open-source projects. I organize local developer meetups, participate in hackathons, and maintain a strong presence in the software engineering community, bringing innovative mobile solutions to the sectors I work in.

Roman Sytnyk

I am a Mobile App Developer specializing in React Native for iOS and Android platforms. With a strong background in native Android and iOS development using Kotlin, Java, and Swift, I bring comprehensive expertise to creating and maintaining mobile applications. My experience spans building offline-first web3 crypto wallet apps, smart home apps, and other industry-specific applications, working collaboratively with global teams and deploying projects to both App Store and Google Play. My passion lies in crafting seamless user experiences through modern technologies like React Native, Expo, and native modules, alongside continuous learning and contributing to open-source projects. I organize local developer meetups, participate in hackathons, and maintain a strong presence in the software engineering community, bringing innovative mobile solutions to the sectors I work in.

Available to hire

I am a Mobile App Developer specializing in React Native for iOS and Android platforms. With a strong background in native Android and iOS development using Kotlin, Java, and Swift, I bring comprehensive expertise to creating and maintaining mobile applications. My experience spans building offline-first web3 crypto wallet apps, smart home apps, and other industry-specific applications, working collaboratively with global teams and deploying projects to both App Store and Google Play.

My passion lies in crafting seamless user experiences through modern technologies like React Native, Expo, and native modules, alongside continuous learning and contributing to open-source projects. I organize local developer meetups, participate in hackathons, and maintain a strong presence in the software engineering community, bringing innovative mobile solutions to the sectors I work in.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
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Language

English
Advanced
Polish
Intermediate
Ukrainian
Fluent
Russian
Fluent

Work Experience

Senior React Native Developer (iOS/Android) + Native Modules Developer (Kotlin/Swift) at Lumen Global
September 1, 2025 - August 7, 2025
Developed and deployed an offline-first Web3 crypto wallet app using Expo (React Native) integrating Drizzle ORM (SQLite), Expo Router, Realm, Trust Wallet Core, Zustand, and Expo Application Services (EAS). Collaborated closely with a team of developers. Additionally developed native modules with Kotlin and Swift for Expo and React Native.
React Native Developer (iOS/Android) + Android Native Support at B3 Consulting Poland
September 1, 2024 - August 7, 2025
Full redesign, maintenance, and implementation of new features for a Smart Home mobile app using React Native CLI with React Navigation, Redux, styled-components, and other libraries. Collaborated within a team environment. Provided support for native Android modules and maintained native Android screens for video surveillance features using Java and Kotlin.
React Native Developer (iOS/Android) at Agilie
July 1, 2023 - August 7, 2025
Created React Native apps from scratch and maintained React Native projects using TypeScript, React Navigation, Redux Toolkit, MobX, i18next, Firebase, Sentry, and various OS features. Rewrote a native Android app from Kotlin to React Native. Built and deployed apps to the App Store and Google Play targeting house building, social media, and cryptocurrency industries. Performed React Native version upgrades.
Android Developer at Agilie
April 1, 2021 - August 7, 2025
Developed and maintained Android apps using Kotlin with Retrofit, Koin, Room, Android Jetpack Architecture Components, Jetpack Compose, Firebase, and other technologies. Communicated with clients and worked in an international team alongside a tech lead and project management from Canada. Deployed apps to Google Play and managed analytics with Firebase. Experience included UI testing with Espresso. Developed apps for options trading and cryptocurrency industries.
Android Developer (Part-time) at IAT Innovative Advertising Technologies GmbH
September 1, 2019 - August 7, 2025
Developed and maintained Android apps using Java and Kotlin, Dagger2, Retrofit, MVVM, Crashlytics, and other technologies. Developed an app for the HR industry. Provided support for tablet apps used by taxi drivers with advertising videos and face recognition features. Worked collaboratively with other developers.

Education

Master's Degree in Software Engineering at Dnipro University of Technology
January 1, 2015 - January 1, 2020

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Financial Services, Real Estate & Construction, Professional Services, Gaming