Oleg A.

I build cross-platform apps in Flutter, from first screen to App Store, together with the backend that runs them. Top Rated Plus, 60+ Upwork projects, 7 years of Flutter and 13 years of Java. I don't only build apps for clients. I publish and monetize my own on the App Store and Google Play, so I understand subscriptions, store review, analytics and what happens after launch. WHAT I CAN TAKE ON • Full apps for iOS, Android, web and desktop from one Flutter codebase • Backends, picked to fit the project: Firebase (Auth, Firestore, Cloud Functions, Hosting), AWS Amplify (AppSync, DynamoDB, Lambda), or a custom Java backend (Spring, REST APIs) when you need full control over business logic and data • In-app subscriptions with RevenueCat, push notifications, real-time data, video streaming • Taking over and stabilizing existing Flutter projects, adding tests, fixing release and signing problems • Store publishing: App Store Connect, Google Play, Microsoft Store (PWA/MSIX) ENTERPRISE JAVA 13 years of Java enterprise work, mainly custom development on Apache OFBiz: ERP modules, business process automation and data modelling. If you need a mobile app connected to an existing Java or ERP system, I can handle both sides. HOW I WORK I'm based in Poland (CET), I write clear updates, and I flag risks early rather than at the deadline. I'm comfortable working alone or inside an existing team. Send me a short description of your project and I'll reply with questions and a rough plan.