Developed a cross-platform mobile app using React Native (Expo).Implemented authentication (Keycloak OAuth2), onboarding and deep linking flows.Built core product features: leaderboards, referral system, challenges and user progress tracking.Integrated REST APIs and worked with backend (.NET + PostgreSQL).Developed internal Next.js admin panel.Configured CI/CD pipelines (GitHub Actions Android, TeamCity iOS) and managed releases to App Store & Google Play.Optimized performance and application startup behavior.Participated in product and UX decisions.

Built the entire front-end architecture from scratch using React and TypeScript, implemented responsive UI with adaptive layouts and multilingual support (i18next), integrated REST APIs for real-time vehicle data, user accounts, and search filters, designed a modular structure using Feature-Sliced Design (FSD) for long-term scalability, developed reusable UI components and ensured accessibility compliance.

Created core UI for finance and scheduling modules, collaborated with designers to translate Figma designs into reusable components, implemented responsive layouts and form validations.

Developed responsive and adaptive UI using React and Next.js, resolved UI bugs and enhanced UX consistency, ensured cross-browser compatibility and accessibility standards.