Денис

Denys Mylymko
Mobile Developer • React Native • Expo • Subscriptions • Performance
■ Remote | ■ Telegram: @svetozarm

Mobile developer with 3 years of experience building production mobile apps, focused on feature development,
subscriptions & monetization, SDK integrations, performance optimization, and build/testing workflows.

■ EXPERIENCE
Mobile Developer
Product Team (Startup) | 2024 — Present | Remote
Develop AI-driven and productivity-focused mobile applications from early stages to production. Focused on hybrid flows,
monetization, and performance optimization.
• Developed new features and screens in React Native
• Implemented WebView-based hybrid functionality
• Built token/subscription-based monetization logic
• Integrated analytics, push notification, and tracking SDKs
• Optimized performance and improved UX
• Prepared app builds and distributed via EAS / TestFlight

AI Chat / Assistant apps Utility / Cleaner features
• Paywalls and subscription access • Gallery and storage cleanup tools
• WebView integrations and hybrid flows • Optimized large lists and media handling
• Chat-based assistant features and UI • Smooth performance for heavy content

Mobile Developer
Outsource Mobile Development Company | 2023 — 2024 | Remote
Developed utility and cleaner mobile apps for international clients. Focused on subscriptions, feature delivery, and
performance optimization.
• React Native feature development and maintenance
• Subscription systems and paywalls (Apphud)
• In-App Purchases implementation
• SDK integrations: AppsFlyer, OneSignal, Sentry
• Optimized large datasets (photos, contacts, storage)
• Basic native integrations (Swift modules, widgets)

Cleaner apps (Gallery / Contacts / Storage) Calories / Fitness Tracker
• Duplicate photo and contact detection • Activity and nutrition tracking
• Efficient handling of thousands of media assets • Charts, statistics, and progress insights
• Smart cleanup, reduced memory usage • Local storage and sync logic
• Custom UI and smooth animations

■■ TECH STACK
Mobile React Native, Expo (managed & prebuild), TypeScript, Expo Router, Native modules

Networking REST APIs, Axios / fetch

State & Architecture Atomic state (atoms), Custom React hooks, Feature-based & modular architecture

Monetization & Apphud, In-App Purchases, AppsFlyer, OneSignal, Sentry
Analytics

UI / UX NativeWind / Tailwind, Reanimated / Moti, Custom animations

Tools Xcode, Git / pnpm, EAS Build / TestFlight, Basic Swift (native modules, widgets)