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I build production AI systems and full-stack products that ship. Multi-agent automation, React and Next.js front ends, Node.js and NestJS back ends, and Flutter mobile apps, delivered end to end for startups. Most developers can write code. Fewer can take a vague idea, architect it properly, and hand a founder a working product that does not fall apart in three months. That is the gap I close. What I do: AI and automation. I design multi-agent systems and LLM-driven workflows that run real operations, not demos. Agent orchestration, automation pipelines, and AI features wired directly into the apps clients actually use. Full-stack web. React, Next.js, TypeScript on the front end. Node.js and NestJS on the back end. REST and GraphQL APIs, relational and document databases, CI/CD pipelines built for teams that need to move fast without breaking things. Cross-platform mobile. Flutter and Dart for one codebase that ships to both iOS and Android with near-native performance and consistent UI. How I work. Clean Architecture, Domain-Driven Design, and SOLID on every engagement, so what I build stays maintainable long after I hand it over. Clients consistently mention three things in reviews: I am fast, the work is genuinely good, and the communication is clear from day one. Recent work includes shipping a travel app MVP end to end, a long-term Flutter wellness platform, a sports investment platform, and a production Firebase backend with complex server-side security rules. If you are a founder who needs someone to own the technical side and ship, not just take tickets, send me a message and tell me what you are building.

Mobile App Developer | Built scalable iOS & Android apps, fixed performance issues, and improved user experience using Flutter and React Native. I review your app idea and give a clear roadmap to build a fast, scalable, and successful mobile app. ✔𝗜 𝘄𝗶𝗹𝗹 𝗿𝗲𝘃𝗶𝗲𝘄 𝘆𝗼𝘂𝗿 𝗮𝗽𝗽 𝗶𝗱𝗲𝗮 𝗮𝗻𝗱 𝘀𝘂𝗴𝗴𝗲𝘀𝘁 𝗶𝗺𝗽𝗿𝗼𝘃𝗲𝗺𝗲𝗻𝘁𝘀 𝗯𝗲𝗳𝗼𝗿𝗲 𝘄𝗲 𝘀𝘁𝗮𝗿𝘁. Many clients struggle with slow, buggy, and poorly designed mobile apps. Some apps fail because of bad user experience, weak performance, or poor scalability. This leads to wasted time, money, and missed business opportunities. I help you build high-performance, user-friendly, and scalable mobile apps for all platforms (iOS, Android, and cross-platform). I use modern technologies like Flutter, React Native, and native development to deliver apps that run smoothly and help your business grow. ➡𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 ✔ Cross-platform mobile app development ✔ Native iOS & Android apps ✔ UI/UX focused app design ✔ API integration & backend systems ✔ App performance optimization ✔ AI integration in mobile apps ➡ 𝗦𝗸𝗶𝗹𝗹𝘀 ✔ Flutter ✔ React Native ✔ Swift ✔ Kotlin ✔ Java ✔ Firebase ✔ REST APIs ✔ UI/UX Design ✔ AI Integration ✔ AI Chatbot Development ➡ 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 ✔ Full mobile app development (iOS & Android) ✔ Cross-platform app development ✔ App UI/UX design ✔ Bug fixing & performance optimization ✔ App upgrade & maintenance ✔ API integration & backend connection ✔ App store deployment (Play Store & App Store) ➡ 𝗪𝗼𝗿𝗸𝗶𝗻𝗴 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 ✔ Built multiple apps from idea to launch ✔ Worked with startups and growing businesses ✔ Delivered scalable and high-quality apps ✔ Long-term client collaboration experience ➡𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆 ✔ E-commerce ✔ Healthcare ✔ Education ✔ Business & Finance ✔ Social Networking ➡ 𝗗𝗼𝗺𝗮𝗶𝗻 ✔ On-demand apps ✔ Booking systems ✔ Payment integration apps ✔ Chat & messaging apps ✔ AI-powered applications ✔ Custom business solutions ➡𝗧𝗼𝗼𝗹𝘀 ✔ Android Studio ✔ Xcode ✔ VS Code ✔ Firebase Console ✔ Git & GitHub ➡𝗪𝗵𝘆 𝗖𝗵𝗼𝗼𝘀𝗲 𝗠𝗲 ✔ Clean and scalable code ✔ On-time delivery ✔ Clear and fast communication ✔ Long-term support ✔ 100% client satisfaction focus ✔Message me now with your app idea and I will guide you step by step for FREE 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀: mobile app developer, flutter developer, react native developer, ios developer, android developer, cross platform apps, mobile app development, flutter app developer, react native app developer, mobile ui ux, firebase developer, rest api, kotlin, swift, java, hybrid apps, native apps, app design, app optimization, bug fixing, app maintenance, scalable apps, startup apps, ecommerce apps, chat apps, booking apps, ai apps, ai integration, chatbot development, custom apps, mobile solutions, android studio, xcode, git, api integration, user friendly apps, performance optimization

Hi👋!... I'm Tomas, a seasoned mobile app developer with over 15 years of experience crafting exceptional mobile applications for Android, iOS and the web. Over the past 15+ years, I’ve been developing innovative, efficient, and high-performing mobile applications for both Android and iOS. I focus on combining the latest technology with intuitive designs, ensuring that every app I create is both visually appealing and highly functional. Throughout my career, I’ve had the pleasure of working with amazing clients all over the world like the Brussels Intercommunal Transport Company, Carrefour, Ghelamco Group, and so many more but what I value the most, is the ongoing relationships I build with my clients. It’s important to me to not just deliver a product, but to work closely with my clients, understand their needs, and create something that really works for them. While I may be new to Upwork, I’ve had the chance to work on plenty of exciting projects elsewhere, and I’m excited to bring that experience and passion to your project! Okay Tomas, what do you bring to the table? 🍽️ ✦ Senior Flutter Developer with extensive knowledge in state management (Bloc, Riverpod, mobx, signal, ..), navigation (go_router, beamer, auto_route), http (dio, http), concurrency (isolates, locks, synchronized), dependency injection, reactive streams, firebase, ... ✦ Developed various Flutter packages on pub.dev for the Flutter community ✦ Created over 100 apps with Flutter & Dart ✦ Responsive communication ✦ Transparent pricing with no hidden costs Hey Tomas, you look like a good fit! How do we continue? 🤝 ✦ Let's kick things off with a discovery session to understand your vision and goals. ✦ We'll work together to define the project scope and create a clear development plan. ✦ You'll get a dedicated platform where you can deliver your assets and requirements. ✦ Regular updates throughout the development process, keeping you in the loop with progress ✦ Prepare the app for launch, guiding you through submission to the app stores ✦ Post-launch support to address any issues and ensure smooth performance Still unsure if I'm the right fit? ☕️ Let's hop on a call and turn your vision into a successful mobile app!