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Full-Stack Engineer with 7+ years of experience building scalable web applications, backend APIs, SaaS platforms, and real-time systems using Node.js, NestJS, TypeScript, Vue, React, PostgreSQL, Redis, Docker, and cloud-based deployments. I specialize in designing reliable backend architectures, REST APIs, authentication systems, role-based access control, database schemas, admin panels, integrations, and performance-focused web applications. I also have strong frontend experience with Vue, React, Next.js, TailwindCSS, Vuetify, and modern component-based UI development. My background includes leading development teams, building B2B SaaS platforms, investment platforms, warehouse and inventory-style systems, 3D web applications, and automation pipelines. I have worked on systems involving microservices, WebSockets, queues, audit logs, media handling, CI/CD, Linux servers, Nginx, Docker, and third-party API integrations. What I can help with: Backend development with NestJS, Node.js, Laravel, Express, and TypeScript REST API design, OpenAPI/Swagger documentation, and database architecture Frontend development with Vue, React, Next.js, Nuxt, and TailwindCSS Admin dashboards, SaaS platforms, inventory systems, and internal tools Authentication, RBAC, audit logs, real-time features, and WebSockets Docker, deployment, server setup, Nginx, PostgreSQL, Redis, and CI/CD API integrations, automation, and system refactoring I focus on clean architecture, clear communication, maintainable code, and practical delivery. Whether you need an MVP, a backend API, a full-stack application, or improvements to an existing system, I can help turn your requirements into a stable and production-ready solution.

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!

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

HOW I’M DIFFERENT When working on a problem, I see multiple steps ahead in all directions. That’s why I build well designed solutions. Not the shortcut costing you in 6 months. Not the quick fix. I architect systems that teams can actually maintain and extend after I’m gone. Quality is speed, for the long term. I work best solving complex problems independently, not when executing someone else’s specifications. I coach & teach teams testing & development practices and advocate for observability, clean systems, and simple development processes. I leave your team more capable. --- ARCHITECTING WITH TECHNICAL DEBT I take complex, tangled systems, make sense of them, and make them maintainable. I dive into those systems, document them, and make them testable, so that they stop breaking when changing them. Deliverables: - Analysis reports with pragmatic architectural improvements - Hands-on development to improve complex systems - Re-writing AI-generated code to be maintainable for humans - Team training and mentoring to work with legacy systems and technical debt - Decision making and architecture with legacy systems & modules INTRODUCING TDD AND IMPROVING TESTING INFRASTRUCTURE I analyze how we can apply suitable testing strategies and/or introduce TDD in your specific code base. I teach and mentor the teams to understand and adopt the practices. I introduce tests in coupled and legacy code bases. Deliverables: - Tailored workshops on TDD and testing - Introducing testing to code bases or application flows - Analysis and recommendation reports for testing strategy TECHNICAL MENTORING, COACHING & TEAM BUILDING I mentor developers and teach engineering practices, workflow optimizations, reviewing strategies, optimal tooling usage, decision making and coding standards. This can happen in 1-on-1 sessions and trajectories, through pair programming sessions, or through small group workshops. Deliverables: - Measurable growth & learning plans for your developers - Performance and speed improvement in day-to-day development work - Hands-on senior knowledge transfer FEATURE ARCHITECTURE AND DEVELOPMENT I design modules to be consumed by other humans. That means architecting pragmatic and simple solutions. To do this, I make sure we understand the business requirements, domain language and coupling with internal and external systems. It is not the easy way, nor the “quick win” way, but it pays off in the long term (and even in the medium and short term). I slice complex problems so that we can continuously merge code and keep change sets small. I ensure that the work is always in a state where it can be picked up by others. In other words, I make myself redundant and leave you with a working system. When I build a feature, it comes with sensible inputs & outputs, a suite of tests, clear documentation and observability. I deliver a reference implementation for your team to follow. Deliverables: - Well tested, loosely coupled modules - Pragmatic plan of attack for complex problems - Simple and maintainable solutions that you can build on