Олег

OLEH MAZUR
SENIOR REACT NATIVE ENGINEER
Khmelnytskyi, Ukraine | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація»)
[відкрити контакти](див. вище в блоці «контактна інформація»)

PROFESSIONAL SUMMARY

Senior React Native Engineer with 4+ years of experience developing and maintaining cross-platform applications for iOS, Android,
and TV platforms. Experienced in building scalable application architecture, responsive user interfaces, complex animations, native
integrations, and third-party services. Comfortable working across the full development lifecycle, from technical design and
implementation to debugging, performance optimization, testing, and release.

CORE SKILLS
Languages: TypeScript, JavaScript, C++, Kotlin, Swift
Mobile: React Native, Expo, React Navigation, Reanimated, Skia, Gesture Handler, Vision Camera
State & Data: Zustand, Redux, MobX State Tree, TanStack Query, MMKV
Native & Media: TurboModules, Amazon Vega/Kepler, Shaka Player, W3C Media APIs, DRM/Widevine
Services: Firebase, Stripe, RevenueCat, Twilio Conversations, Intercom, Sentry
Quality & Delivery: Jest, React Native Testing Library, GitLab CI, GitHub Actions, Expo EAS, Fastlane
AI-Assisted Development: OpenAI Codex, Claude Code, Cursor, GitHub Copilot - code generation, refactoring, debugging, documentation,
and technical research.
Engineering Practices: SOLID, DRY, KISS, YAGNI, design patterns.

PROFESSIONAL EXPERIENCE
React Native Developer | GlobalLogic Sep 2025 – Present
Lviv, Ukraine
• Develop and maintain React Native applications for mobile and TV platforms, delivering reusable UI components, responsive layouts,
and complex animations.
• Extend React Native through native C++ TurboModules and platform-specific integrations while resolving performance, stability,
memory, and playback issues across JavaScript and native layers.
• Design media playback controls, device discovery, pairing, cross-device activation, and reliable TV focus management for D-pad
navigation.
• Contribute to technical design, code reviews, debugging, performance optimization, and architectural improvements.
• Mentor team members, conduct technical interviews, and participate in candidate evaluation.

Project 1: Streaming Platform — Multi-device movie and TV streaming application
• Re-architected the video player for Amazon Vega/Kepler, designing a scalable playback system for VOD and live content on top of Shaka
Player and W3C Media APIs.
• Investigated and resolved critical media-player stability, performance, memory, and ANR issues across TV platforms.
• Developed C++ TurboModules for BIF thumbnail parsing and an mDNS/TCP-based device discovery and pairing solution.
• Built a Reanimated worklet-based seek bar with synchronized gesture handling and improved player and carousel focus management.
Technologies: React Native, TypeScript, C++, TurboModules, Reanimated, Amazon Vega/Kepler, Shaka Player, W3C Media, Widevine, Zustand,
Redux, Firebase Analytics, MMKV

Project 2: Trading Education Application — Interactive learning and simulated trading tools
• Developed interactive charts for market data and asset-performance visualization using D3, Skia, and SVG.
• Implemented complex UI animations, responsive layouts, reusable components, and trading-tool business logic.
Technologies: React Native, TypeScript, Zustand, Reanimated 4, іGesture Handler, Skia, D3, MMKV, Firebase Crashlytics, UXCam, Nitro
Modules

Oleh Mazur • Senior React Native Engineer

React Native Developer | Iterators Nov 2022 – Sep 2025
Warsaw, Poland
• Developed and maintained cross-platform mobile applications for clients across travel, commerce, social networking, media, and
mobility domains.
• Contributed to the company’s reusable mobile application template, keeping architecture and tooling aligned with current React Native
practices.
• Maintained Android and iOS CI/CD pipelines using GitLab CI, GitHub Actions, and Expo EAS.

Project 1: Travel Booking Application
• Implemented application state with MobX State Tree and integrated Stripe payments, Firebase push notifications, Intercom, Sentry,
deep links, and internationalization.
• Created polished interface animations with Reanimated and supported automated testing with Jest.
Technologies: React Native, TypeScript, MobX State Tree, Stripe, Firebase Messaging, Intercom, Reanimated, i18next, Sentry, React Navigation,
MMKV, Jest

Project 2: Role-Based Auction Platform
• Implemented Universal Links and App Links, multi-factor authentication with biometrics and OTPs, advanced filtering and sorting, and
QR-based contact sharing.
Technologies: React Native, TypeScript, MobX State Tree, Reanimated, Firebase, Biometric Authentication, MMKV, i18next, Jest

Project 3: Camera-Based Performance Application
• Integrated Vision Camera and external-device communication, built custom interfaces with React Native Skia, and implemented real-
time chat using Twilio Conversations.
• Delivered Firebase OAuth authentication, video recording, performance scoring features, and animated data visualizations.
Technologies: React Native, TypeScript, Vision Camera, Skia, Reanimated, Twilio Conversations, Firebase, TanStack Query, MMKV, FFmpegKit

Project 4: Mobility Comparison Application
• Reverse-engineered native iOS and Android application behavior, refactored legacy React Native code, and implemented third-party
provider account linking.
• Upgraded the application to a current stable React Native version, resolving compatibility issues and improving maintainability.
Technologies: React Native, TypeScript, Firebase, Segment, Mixpanel, Sentry, Intercom, Reanimated, MobX, MMKV

Add-hoc projects: social networking, subscriptions, real-time chat, event scheduling, media analysis, WebView integrations, analytics, and
release automation.

Software Development Trainee | Binary Studio Academy Jun 2022 – Sep 2022
Lviv, Ukraine
• Completed an intensive development program covering React Native, TypeScript, React, Redux, Kotlin, GraphQL, REST APIs, deep linking,
push notifications, and WebSockets.
• Built web and mobile training projects individually and as part of a team.

EDUCATION
B.Sc. in Computer Science and Information Technology | Khmelnytskyi National University | 2018
B.A. in Political Science and Government | Olsztyńska Szkoła Wyższa | 2010

PROFESSIONAL DEVELOPMENT
Node.js: Hillel IT School, 2025 — Express, MongoDB, Docker, REST APIs, OAuth, WebSockets, file processing, and payments
C++: Prometheus, in progress — algorithms, data structures, memory management, OOP, templates, and STL

LANGUAGES
Ukrainian: Native
English: Upper-Intermediate (B2)
Polish: Upper-Intermediate (B2)

Oleh Mazur • Senior React Native Engineer