- Developed and maintained a large-scale production Flutter app inthe betting and fintech domain.

- Implemented complex deposit and withdrawal flows (cards, IBAN,crypto, Google Pay) with validation, limits and payment-type–specific logic.

- Integrated WebView and external browser payment flows and sup-ported auth, profile, settings and support modules using Riverpod,REST APIs and a custom design system.

- Developed a new social networking application from scratch usingFlutter.

- Implemented core social features (messenger, likes, posts, com-ments, notifications) with real-time updates via WebSockets.

- Designed and built a responsive, intuitive UI focused on smooth in-app interactions.

- Developed an educational mobile application from scratch and implemented the UI based on Figma designs.

- Integrated Firebase (Firestore, Auth, Crashlytics, Cloud Functions),Amplitude, Facebook App Events, Google Translate and OpenAI API.

- Implemented multi-provider auth (Google, Facebook, Apple ID,email/phone, anonymous) and web-support modules.

- Built language-learning flows: vocabulary search and translation,word trainers, level-assessment trainer; published the app to GooglePlay and the App Store.

- Updated all dependencies for the latest version of flutter
- Implemented the application authorization page
- Implement firebase authentication via Google
- Move the project’s architecture to the industry best practices approach using latest BLoC library and models’ code generation
- Uploaded files (photo / video) to the server using post multipart
- Implemented media sharing from the current application to external resources using flutter share
- Code refactoring
- Bugs fixing
- Implemented media sharing from the device to the current application using flutter sharing intent