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Dmytro User

@dmytrouser4

Lead Flutter Engineer building a MilTech app from scratch, with architecture and offline maps; previously launched Hotline’s app to ~100K users.

Ukraine
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At a MilTech company (under NDA), I’m leading a cross-functional team building a defense-tech mobile app for iOS and Android from scratch. I designed its Clean Architecture and BLoC foundation, and work with the backend team on REST and WebSocket contracts.

I’m also building offline map features with ArcGIS Maps SDK for Flutter, including geometry and coordinate handling. Alongside development, I help define client-app requirements and established the team’s planning and code review practices.

At Hotline, I built a price comparison app with one other developer and launched it in 10 months; it reached ~100K users across Android and iOS. I implemented features including offline Favorites and catalog filters, and handled Android releases end-to-end.

Earlier, at Ancestry, I built notifications, feed and stories features for a family history platform with 10M+ users. I also helped migrate messaging to a custom backend API, migrated Java to Kotlin and RxJava to Coroutines, and rebuilt XML screens with Jetpack Compose.

Experience

Work history, roles, and key accomplishments

DE

Flutter Developer (Freelance)

Debertz

Jul 2024 - Oct 2024 (3 months)

Redesigned the in-app menu with animations, added onboarding for new players, and built a JSON-driven rules screen for a mobile card game.

YS

Mobile Developer

Yellow Stone

Jan 2020 - Jun 2021 (1 year 5 months)

Built reusable Android, Flutter, and Cordova libraries with documentation, and released several PWA-based mobile games to Google Play and iOS via TestFlight.

ST

Junior Android Developer

StarApps

Mar 2019 - Jan 2020 (10 months)

Added speech practice to the Speakly language-learning app using Google Speech Recognizer, and built and published an Android app with Firebase and Google Maps navigation.

Education

Degrees, certifications, and relevant coursework

Lviv Polytechnic National University logoLU

Lviv Polytechnic National University

Master of Engineering, Computer Engineering

Master of Engineering in Computer Engineering from Lviv Polytechnic National University, completed in 2020.

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