parniekov

React Native Developer

I am a React Native developer with 7+ years of experience building and shipping cross-platform mobile applications for iOS and Android. Over my career I've delivered products across fintech, HoReCa, e-commerce, sport, and entertainment domains — including a fintech app with 500K+ users on Google Play and a field-survey app I engineered to work in a fully offline mode.

My core stack is React Native and TypeScript, with deep experience in state management Redux Toolkit, React navigation, and form handling. I'm comfortable writing custom native modules in Swift, Objective-C, Kotlin, and Java for high-performance features like camera, video players, and WatchOS integrations. I've built real-time systems with SignalR WebSockets, integrated multiple payment gateways and POS terminals, and handled secure authentication, biometrics, and token storage.

Beyond feature work, I care a lot about engineering quality and process. I set up unit and E2E testing (Jest, React Native Testing Library, Detox), configure CI/CD pipelines (App Center, TestFlight, Fastlane, Expo), manage OTA updates via CodePush, Expo Updates implement feature toggles for gradual rollouts, and work within trunk-based development workflows. I also mentor junior/middle developers and lead code reviews to keep the team shipping clean, maintainable code.

I'm looking for a senior React Native role where I can own complex mobile features end to end, shape architecture decisions, and help raise the technical bar of the team. I'm especially drawn to product-focused companies in fintech or other domains where reliability, performance, and great user experience genuinely matter.

Experience: 7 years

Yearly salary: $96,000

Hourly rate: $45

Nationality: 🇺🇦 Ukraine

Residency: 🇺🇦 Ukraine

Experience

React Native Developer

Virtido

2024 - 2026

Develop and maintain a cross-platform mobile application for iOS and Android platforms using React Native and Typescript based on Redux Toolkit with Redux Persist for state persistence. React Navigation for intuitive UI with over 25 screens: authentication, restaurant selection, order management, table management, payment processing, menu browsing, order editing, and profile management. HTTP requests through Axios and REST API. Real-time communication via SignalR WebSocket connections for live order updates. Integration of multiple payment gateways including POS terminals through native modules.

React Native Developer

N-iX

2022 - 2024

Develop and maintain a cross-platform mobile application for iOS and Android platforms using React Native and TypeScript based on Redux Toolkit and Redux Saga (SagaSlices). React Navigation, intuitive UI for over 30 screens: authentication, registration, profile, payments, statements, transactions, card management, notifications, and chat widget integration. HTTP requests through Axios and REST API. Push Notifications of Firebase Cloud Messaging for iOS and Android. Configuration of permission requests, token handling. Integration with WatchOS app through Objective-C bridge. Writing unit tests using Jest and React Native Testing Library. Setting up E2E testing through Detox. Implementation of pre-commit hooks through Husky for automatic code verification. Setting up CI/ CD through Microsoft App Center with separate configurations for dev and prod environments. Automated builds and distribution through App Center and TestFlight. Implementation of feature toggles for gradual feature rollout. Configuration of CodePush for rapid updates. Token storage through React Native Keychain. Analytics and Monitoring Integration for tracking usage and collecting crash reports. Working in a team with trunk-based development strategy and short-lived feature branches for rapid change integration.

React Native Developer

Epam

2021 - 2022

Develop and maintain the cross-platform mobile app loyalty, payments (iOS/ Android) on React Native and JavaScript. Redux + Redux Persist for state, React Navigation for UI (50+ screens). Features: Auth0 and social login, profile and orders, cart and checkout, loyalty cards and points, QR payments and scanning, chat, referrals, push notifications, Mapbox for delivery tracking, biometrics,Bugsnag, CodePush, Axios. Jest, Husky, Storybook, react-native-localization.

React Native Developer

Coax Software

2019 - 2021

Lead the development and maintenance of cross-platform mobile applications (iOS/ Android) across Sport, Entertainment, and Business domains using React Native and TypeScript. Architected project setups and provided technical estimations for core features. Developed and maintained complex UI/ UX and business logic components. Engineered custom Native Modules for high-performance features including Camera, Video Player, and PDF Editor. Implemented state management and form handling using Redux Saga and Formik. Integrated secure authentication (Google, Facebook), Firebase Dynamic Links, and Push Notifications. Managed API interactions via Fetch API. Conducted feature demonstrations for stakeholders and provided technical mentorship to junior developers to ensure code quality and best practices.

Android Developer

OnSoft, BigDataHush, Freelance.

2018 - 2019

Develop and maintain a mobile application for and Android platform using Java and Android SDK. Retrofit 2 for API calls, Glide / Picasso for image loading, RecycleView for rendering lists. Using Logcat and the Android Studio Profiler to track down memory leaks or crashes reported in the Google Play Console. Local Persistence: Using Room or SQLite to cache data locally. Building screens using ConstraintLayout. Implementation AWS face recognition.

Skills

agile

android

fintech

firebase

full-stack

ios

java

javascript

jira

kotlin

nextjs

react

react-native

security

swift

tech-lead

typescript

english

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