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 focused on iOS and Android applications across social networking, travel,
commerce, media, and mobility. Experience spans complete mobile front-end development, application
architecture, complex animations, payments, authentication, camera features, and real-time messaging.
Experienced in implementation, debugging, performance optimization, testing, and releases, with additional
expertise in C++ native modules, TV applications, mentoring, and technical interviews.

TECHNICAL SKILLS
Mobile: React Native, TypeScript, JavaScript, Expo, bare workflow, iOS, Android
UI and navigation: Reanimated, React Native Skia, React Native Gesture Handler, React Navigation
State and data: Zustand, Redux, MobX State Tree, TanStack Query, MMKV, REST APIs, GraphQL
Integrations: Firebase, Stripe, RevenueCat, Twilio Conversations, Vision Camera, Intercom, Sentry
Testing and delivery: Jest, React Native Testing Library, Git, GitLab CI, GitHub Actions, Expo EAS, Fastlane
Native development: C++ TurboModules; additional languages: Kotlin and Swift
AI-assisted development: OpenAI Codex, Claude Code, Cursor, GitHub Copilot

PROFESSIONAL EXPERIENCE

GlobalLogic | React Native Developer Sep 2025 - Present
Lviv, Ukraine
• Develop and maintain React Native applications; contribute to technical design, code reviews, architectural
improvements, and debugging across JavaScript and native layers.
• Mentor team members, conduct technical interviews, and participate in candidate evaluation.
Project 1: Trading education mobile application
• Built interactive market-data and asset-performance charts using D3, React Native Skia, and SVG.
• Implemented trading-tool business logic, reusable components, responsive layouts, and animated
interactions using Reanimated and Gesture Handler.
Key technologies: Zustand, Reanimated 4, Skia, D3, SVG, MMKV, Firebase Crashlytics, UXCam, Nitro Modules
Project 2: TV streaming and native integrations
• Re-architected the video player for Amazon Vega/Kepler, building a playback system for VOD and live
content with Shaka Player and W3C Media APIs.
• Resolved media-player stability, performance, memory, and ANR issues across JavaScript and native layers.
• Developed C++ TurboModules for BIF thumbnail parsing and an mDNS/TCP-based device discovery and
pairing solution; worked on cross-device activation.
• Built a Reanimated worklet-based seek bar with synchronized gesture handling and improved player and
carousel focus management for D-pad navigation.
Key technologies: C++, TurboModules, Shaka Player, W3C Media APIs, Widevine DRM, Reanimated, Zustand, Redux

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PROFESSIONAL EXPERIENCE CONTINUED

Iterators | React Native Developer Nov 2022 - Sep 2025
Warsaw, Poland
• Developed and maintained cross-platform mobile applications for clients across travel, commerce, social
networking, media, and mobility.
• Contributed to the company's reusable mobile application template, maintaining shared architecture and
tooling.
• Maintained and enhanced Android and iOS CI/CD pipelines using GitLab CI, GitHub Actions, and Expo EAS.
Project 1: Social networking application
• Built the entire React Native front end for a social networking application with collaboration events and
private media sharing.
• Implemented event creation and scheduling, group activities, reminders, following, and access to private
albums.
• Integrated real-time private and group chat using Twilio Conversations, added notifications, and configured
CI/CD pipelines.
Key technologies: Twilio Conversations, RevenueCat, Firebase, Intercom, Veriff, Branch.io, Reanimated, release-it
Project 2: Travel booking application
• Developed features for a flight-booking application with reservation management and travel deals;
implemented application state using MobX State Tree.
• Integrated Stripe payment methods and payment processing, Firebase push notifications, Intercom support
messaging, and Sentry error tracking.
• Implemented deep links, internationalization, and Reanimated interface animations; supported automated
testing with Jest.
Key technologies: Expo Modules, MobX State Tree, Stripe, Firebase Messaging, Intercom, Sentry, React Navigation,
Jest
Project 3: Camera and performance tracking application
• Integrated Vision Camera for video recording and implemented communication with external devices in a
target-based performance tracking application.
• Built custom interfaces with React Native Skia, performance scoring features, and animated data
visualizations.
• Implemented Firebase authentication and real-time chat using Twilio Conversations.
Key technologies: Vision Camera, Skia, Reanimated, Twilio Conversations, Firebase, TanStack Query, FFmpegKit
Project 4: Role-based auction platform
• Implemented Universal Links and App Links, multi-factor authentication with biometrics, OTPs, and an
authenticator app.
• Built advanced filtering and sorting, following features, and QR-based contact sharing for a platform for
listing and purchasing goods.
Key technologies: MobX State Tree, Firebase, Reanimated, biometric authentication, MMKV, QRCode-SVG, Jest

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PROFESSIONAL EXPERIENCE CONTINUED

Iterators mobile projects continued
Project 5: Mobility comparison application
• Worked on an application comparing rideshare, taxi, and black-car services; reverse-engineered native iOS
and Android application behavior.
• Refactored legacy React Native code and implemented account linking for third-party mobility providers.
• Upgraded React Native, resolving library compatibility issues and improving maintainability.
Key technologies: Firebase, Segment, Mixpanel, Sentry, Intercom, Reanimated, MobX, MMKV, Lottie
Project 6: Audio and video performance analysis application
• Implemented file handling and uploads to the backend, camera integration, and custom video recording
interfaces.
• Integrated ECharts to display performance metrics and built a custom WebView wrapper for charts and web
application content.
• Developed complex interface layouts and animations for reviewing audio and video performances.
Key technologies: Expo Camera and AV, WebView, ECharts, Firebase, Reanimated, MobX State Tree, React Hook
Form

Binary Studio Academy | Software Development Trainee Jun 2022 - Sep 2022
Lviv, Ukraine
• Built individual and team projects, including a React and Redux travel web application and a React Native
marketplace using GraphQL.
• Implemented deep links, REST API integration, localized screens, and error-handling middleware in a React
Native and TypeScript application; reimplemented a training mobile app in Kotlin.
Key technologies: React Native, TypeScript, Redux Toolkit, React Hook Form, WebSockets, Socket.io, MMKV, i18next

EDUCATION
BSc in Computer Science and Information Technology: Khmelnytskyi National University, 2018
BA 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,
payments
C++: Prometheus, in progress - algorithms, data structures, memory management, OOP, templates, STL
Additional study: React Native (Meta, Coursera); JavaScript Advanced and TypeScript patterns (Udemy);
SwiftUI (Hacking with Swift)

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

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