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I’m a senior React Native developer with 14+ years of mobile engineering experience, including 9+ years building production iOS and Android apps with React Native. I’ve shipped 12+ mobile applications end-to-end—from greenfield architecture and feature delivery through store release and long-term maintenance—often as the sole mobile contributor and sometimes while mentoring teammates or leading small mobile teams. I love turning complex product requirements into clean, maintainable code using TypeScript and modern React Native tooling (Expo, New Architecture, Hermes, Reanimated, Gesture Handler, navigation, and testing/CI). I’m also hands-on with native iOS (Swift/Objective-C) and Android (Kotlin/Java), and I’ve built reliable delivery pipelines with Fastlane and CI/CD, while integrating robust backend/auth and observability (e.g., Sentry and Firebase) for real-world reliability.…I’m a senior React Native developer with 14+ years of mobile engineering experience, including 9+ years building production iOS and Android apps with React Native. I’ve shipped 12+ mobile applications end-to-end—from greenfield architecture and feature delivery through store release and long-term maintenance—often as the sole mobile contributor and sometimes while mentoring teammates or leading small mobile teams. I love turning complex product requirements into clean, maintainable code using TypeScript and modern React Native tooling (Expo, New Architecture, Hermes, Reanimated, Gesture Handler, navigation, and testing/CI). I’m also hands-on with native iOS (Swift/Objective-C) and Android (Kotlin/Java), and I’ve built reliable delivery pipelines with Fastlane and CI/CD, while integrating robust backend/auth and observability (e.g., Sentry and Firebase) for real-world reliability.

Sergei Nikitin

App Developer, Programmer, Software Engineer, +2

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I’m a senior React Native developer with 14+ years of mobile engineering experience, including 9+ years building production iOS and Android apps with React Native. I’ve shipped 12+ mobile applications end-to-end—from greenfield architecture and feature delivery through store release and long-term maintenance—often as the sole mobile contributor and sometimes while mentoring teammates or leading small mobile teams. I love turning complex product requirements into clean, maintainable code using TypeScript and modern React Native tooling (Expo, New Architecture, Hermes, Reanimated, Gesture Handler, navigation, and testing/CI). I’m also hands-on with native iOS (Swift/Objective-C) and Android (Kotlin/Java), and I’ve built reliable delivery pipelines with Fastlane and CI/CD, while integrating robust backend/auth and observability (e.g., Sentry and Firebase) for real-world reliability.…I’m a senior React Native developer with 14+ years of mobile engineering experience, including 9+ years building production iOS and Android apps with React Native. I’ve shipped 12+ mobile applications end-to-end—from greenfield architecture and feature delivery through store release and long-term maintenance—often as the sole mobile contributor and sometimes while mentoring teammates or leading small mobile teams. I love turning complex product requirements into clean, maintainable code using TypeScript and modern React Native tooling (Expo, New Architecture, Hermes, Reanimated, Gesture Handler, navigation, and testing/CI). I’m also hands-on with native iOS (Swift/Objective-C) and Android (Kotlin/Java), and I’ve built reliable delivery pipelines with Fastlane and CI/CD, while integrating robust backend/auth and observability (e.g., Sentry and Firebase) for real-world reliability.

Available to hire

I’m a senior React Native developer with 14+ years of mobile engineering experience, including 9+ years building production iOS and Android apps with React Native. I’ve shipped 12+ mobile applications end-to-end—from greenfield architecture and feature delivery through store release and long-term maintenance—often as the sole mobile contributor and sometimes while mentoring teammates or leading small mobile teams.

I love turning complex product requirements into clean, maintainable code using TypeScript and modern React Native tooling (Expo, New Architecture, Hermes, Reanimated, Gesture Handler, navigation, and testing/CI). I’m also hands-on with native iOS (Swift/Objective-C) and Android (Kotlin/Java), and I’ve built reliable delivery pipelines with Fastlane and CI/CD, while integrating robust backend/auth and observability (e.g., Sentry and Firebase) for real-world reliability.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Advanced

Russian

Fluent

Work Experience

Senior Mobile Developer at GemWords / AESD LAB FZCO

February 1, 2026 - July 31, 2026

Built a language-learning MVP with ~20 screens and dozens of components using Expo, TypeScript, React Native New Architecture, and Hermes. Started as the sole mobile developer, then mentored an entry-level developer while collaborating with product and backend. Standardized architecture, removed redundant/inconsistent code, and extended the Node.js/Next.js API with Sign in with Apple and Google authentication for mobile clients. Delivered iOS via TestFlight and Android via Expo EAS artifacts using Fastlane, GitHub Actions, and Expo EAS, progressing delivery automation.

Senior React Native Developer at Arcadia Global Solutions

May 1, 2025 - November 30, 2025

Re-architected a three-app EdTech platform into a modular core with config-driven apps and shared foundation, reducing code volume by ~65% and enabling new apps from the same setup. As the sole developer, migrated from JavaScript/Flow and Redux-Saga to TypeScript and Zustand to improve maintainability, extensibility, and testability. Increased project-wide test coverage to 88% using Jest, React Native Testing Library, and Detox on React Native New Architecture; delivered internal releases and demos before handing over to the customer.

React Native Developer at Arcadia Global Solutions

May 1, 2025 - November 1, 2025

Led deep refactor of mobile apps for a school system; migrated codebase from JavaScript with Flow.js and Redux to TypeScript and Zustand; collaborated with cross-functional teams to adopt new technologies and improve performance.

Senior React Native Developer at Nitka Technology

December 1, 2023 - March 31, 2025

Built authentication, push notifications, and deep links plus reusable components for an iOS and Android news app as one of two mobile developers. Engineered a Reanimated + Gesture Handler card deck with gesture-driven infinite scrolling, nested dynamically sized cards, synchronized state, and pull-to-refresh separated from horizontal navigation. Replaced manual builds with self-service GitHub Actions and Fastlane pipelines for iOS and Android through store delivery, bringing mobile releases into DevOps ownership. Added code-quality checks and mentored a junior developer.

Mobile Developer at Nitka Technology

December 1, 2023 - March 1, 2025

Designed and developed iOS/Android software using React Native/TypeScript; participated in product planning; worked with Xcode/Android Studio/WebStorm; implemented CI/CD changes; conducted code reviews.

Senior React Native Developer at Mercury Development

September 1, 2023 - November 30, 2023

Created a fully operational React Native project from scratch, ready for the full development lifecycle, including architecture, GitLab CI, and development tooling (ESLint, lint-staged, Prettier). Automated the iOS delivery workflow from build to TestFlight with Fastlane. Worked alongside and onboarded two developers, then handed the project over for continued development.

Senior React Native Developer at Mercury Development, LLC

September 1, 2023 - November 1, 2023

Preparation of project launch; set up code quality tools; maintained and updated CI/CD processes (Gitlab CI, Fastlane); conducted code reviews.

Senior Mobile Developer at InGames.io

December 1, 2022 - July 31, 2023

Owned the complete React Native implementation of a sports-betting app featuring WebSocket odds and live tracking. Submitted iOS and Android apps for store review.

Senior Mobile Developer (React Native / Flutter) at InGames.io

December 1, 2022 - July 1, 2023

Designed/developed iOS/Android apps using React Native/TypeScript; contributed to Flutter/Dart/BLoC variant; maintained CI/CD processes (Gitlab CI, Fastlane); conducted code reviews; published apps to Apple App Store and Google Play.

Mobile Development Team Lead at Qlean.ru

March 1, 2022 - March 1, 2023

Led development of a mobile application; product management and inter-team coordination; developed iOS/Android using React Native/TypeScript/Objective-C/Java; analyzed Flutter viability; maintained CI/CD (Gitlab CI, Fastlane); recruited.

Mobile Development Team Lead at Mango Telecom

May 1, 2019 - February 1, 2022

Led mobile app development team; product management and cross-team coordination; evaluated Flutter and Kotlin Multiplatform; published to App Store/Play Market; maintained CI/CD; conducted code reviews.

React Native Developer at TalentTech

July 1, 2018 - April 30, 2019

Built and shipped Smena, a REST-backed conversational hiring wizard for blue-collar workers, to the App Store and Google Play as the sole mobile developer within five months. Implemented deep links, push notifications, and biometrics, then hired a second developer.

Senior React Native Developer at TalentTech

July 1, 2018 - April 1, 2019

Designed and built iOS/Android apps from scratch to publication using React Native/JavaScript/Objective-C/Swift/Java; participated in recruitment; conducted code reviews; published on App Store/Play Market.

iOS Developer at Nmarket.PRO

December 1, 2017 - June 1, 2018

Development and maintenance of NMarket.Pro client; iOS app development with Xcode/JSON/RESTful API/HTTP/Realm; support, debugging; Agile/Scrum; Git.

React Native Developer at Goglia Nutrition

August 1, 2017 - November 1, 2017

Design and development for iOS/Android using React Native; work with Xcode/Android Studio/JSON/RESTful API; contributed to G-Plans client app; participated in Agile/Scrum.

Lead iOS Developer at AnjLab

August 1, 2014 - August 31, 2017

Led delivery of three iOS banking apps (BKS, PSB, Renaissance Credit), implementing certificate pinning and biometrics. Shipped all three to the App Store and published Swarmium, the company’s first production React Native app, on Google Play.

Mobile Developer (iOS / React Native) at AnjLab

August 1, 2014 - August 1, 2017

Designed and developed software for iOS; React Native development; Xcode, XML, JSON, RESTful API, push notifications; maintained and debugged across multiple clients; Jira/Agile; Git/SVN.

iOS Developer at Self-employed

February 1, 2014 - August 1, 2014

Independent iOS development; Xcode, Interface Builder, XML/JSON, RESTful API, Core Location, push notifications; built modules for iBuildApp platform; published apps.

iOS Developer at iBuildApp

April 1, 2012 - February 1, 2014

Designed and developed iOS applications; modular system development; automated build system contributions; Xcode, Interface Builder, XML/JSON, RESTful API; publishing to App Store.