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🏅TOP-RATED ⭐ 5-star service ✅ Upwork verified 👍🏼100% client satisfaction 4+ years of Mobile App development experience and more than 15 high-quality apps delivered for iOS, Android, and the Web. ➥ Services Offered: • Full Stack development for Android, and iOS using Flutter & FlutterFlow • Rapid Prototyping and MVP Development • User Interface & User Experience Design (UI/UX) • App Deployment and Publishing Assistance • App performance optimization I began my career developing native apps such as Todo lists, note-taking tools, and chat applications like WhatsApp. After discovering Flutter, I was intrigued by its ability to streamline Android and iOS development into a single codebase. Over time, my interest in Flutter grew, leading me to explore FlutterFlow for developing apps with low-code solutions. For the past 4 years, I have dedicated myself to mastering Flutter and FlutterFlow, consistently delivering exceptional applications. I'd love to learn about your project and see if we can be a great fit. Let’s transform your app ideas into reality together!
Hi, Thanks for reviewing my profile. I have been specializing in mobile native and cross-platform for the past 10 years, especially native (swift, SwiftUI, java, kotlin) and cross-platform (react native, flutter, xamarin/.Net MAUI) as well as the backend(restful API, GraphQL), website(admin dashboard, landing page, etc), Blockchain(Rust, DeFi). I definitely can turn your idea into reality successfully as I am a senior developer. Please feel free to message me at any time. Regards
✅ Top 1% Leader in Full Stack Flutter Mobile and Web App Development with Gen AI | 7 Years of Proven Expertise Testimonials: ⭐️⭐️⭐️⭐️⭐️ "Johannes' dedication and development skills are top-notch." ⭐️⭐️⭐️⭐️⭐️ "Johannes consistently exceeds our expectations with outstanding results." ⭐️⭐️⭐️⭐️⭐️ "Johannes' clear communication and punctuality make the process seamless." With over 7 years of experience as a Full Stack Mobile App and Web Developer, I have successfully developed numerous outstanding mobile applications and websites. 🏆 Services Offered: ✓ Mobile Applications (Android, iOS, Flutter, React Native, FlutterFlow) ✓ Generative AI Capabilities (ChatGPT, Gemini, Vertex AI, GenKit and Vector DBs) ✓ Responsive Websites (Flutter, React, WordPress, HTML5, CSS, JavaScript) ✓ Full-Stack Development (Firebase, AWS, NodeJS, etc.) ✓ Database Development (AWS, Firebase, MongoDB, MySQL, Oracle, etc.) ✓ UI/UX Design for Apps & Websites (Figma, Photoshop) 🏆 Mobile App Development: ✓ E-Commerce Apps ✓ Social Media Apps ✓ Fintech Apps ✓ Healthcare Apps ✓ Tourism Apps ✓ Education Apps ✓ Fitness Apps ✓ Booking Apps ✓ Payment Apps(In-App Purchases, Stripe, PayPal, etc.) ✓ Video Streaming Apps ✓ Food Delivery Apps ✓ Dating Apps 🏆 Website Development: ✓ E-Commerce Website ✓ Corporate Websites ✓ Landing Pages ✓ Social Media Websites ✓ Promotional Websites ✓ Catalog Websites ✓ CMS Website Let’s discuss your project! ⚡️ My exceptional communication sets me apart from other developers.
I am a seasoned expert in web technologies. My experience includes projects spanning the entire ecosystem. On the backend, I have crafted rest APIs, designed databases, and managed various environments. My frontend work includes modern web applications and mobile apps. I heavily leverage popular frameworks, including Django, Flask, React, React Native, Vue.js, and jQuery.
Full Stack Engineer with 9 years of market experience having worked with a variety of technologies and projects with different needs and architectures. Deeply studies contextual project needs to decide for the most optimal technology stacks for each situation delivering results transparently. Focuses on a combination of clear communication with stakeholders and openness about the development environments and procesess. The strong Linux background assisted in the agile learning of servers and infrastructure in general. Have worked and delivered an extensive number of projects for private companies, ranging from web to native apps and integrations. At the moment I'm in Japan, but I can easily match other timezones for work purposes. I will be heading back to Helsinki where I live at the end of January.
I'm CTO, System Architect, Full-Stack developer with 10+ years of experience. I've experience of building billing systems for Internet Service Providers, Mobile Content Providers, Site Builder Systems (like a SitePlus.com, Wix.com), Learning Management System (smls.com.ua, maktapp.az), small tools and etc. stuff. I can work alone or manage a team and work together to keep them enough mentored and motivated. Experience list (developing during work): 1. GoLang - expert with 5+ years experience 2. NodeJS - expert with 10+ years experience (since v0.4) 3. Ruby - expert with 3+ years experience 4. Elixir - expert with 3+ years experience 5. PHP - expert with 15+ years experience 6. Rust, C++, C#, Java, Python- debugger and had deal with code written on these languages, writing own small projects on Rust as hobby before using it in customer's work. 7. Databases: MySQL (also Galera Cluster) - expert (installing, tuning, replication, complex queries, building optimal db solutions), PostgreSQL - expert (installing, tuning, replication, complex queries, building optimal db solutions), MongoDB - expert (currently preferred as primary db in most of projects, have rich experience on any aspect of this db), CouchBase - expert (using as secondary after MongoDB to cache, store data that is requested with high concurrency), CouchDB - expert (same as CouchBase, but I prefer CouchBase for it's active data in memory principles), RethinkDB - expert (I use it to build back communication between api micro-services and web-socket micro-services to route response to exact connection in context of multi-instance containers) 8. Frontend frameworks: AngularJS, ReactJS - have experience of supporting code written using these frameworks and experience can be developed if there is big need to work with them 9. Building micro-services, containerizing, delivering to cloud infra. 10. Server OSs: ArchLinux, Debian, Alpine 11. Continuous Integration: CI Scripting in GitLab, Jenkins, CloudBuild 12. Team/Task management and boards in Jira 13. Cloud service providers: GCP, AWS Have problem - I'll find solution, only question is time. I would love the opportunity to work with you on your project!
A dedicated and visionary leader with extensive experience in cross-platform mobile application development, I excel at both independent and collaborative projects. My primary focus is on Flutter—the powerful, open-source UI toolkit by Google—where I create scalable, visually engaging, and performance-driven apps that run seamlessly on multiple platforms from a single codebase. My technical background spans a range of technologies, with Flutter and Dart at the core of my current workflow. I am highly proficient in integrating Firebase’s suite of cloud-based tools (such as Firestore, Authentication, and Cloud Functions) into Flutter apps, ensuring real-time data sync, secure user management, and robust backend operations. In addition, my prior experience in native Android and iOS development, as well as knowledge of server-side frameworks and database systems, allows me to craft end-to-end solutions that are both maintainable and easily scalable. I am passionate about UI/UX principles, ensuring that every Flutter application I create is intuitive, accessible, and visually appealing. Beyond the technical details, my interpersonal skills and leadership qualities enable me to lead teams effectively, collaborate with stakeholders, and guide projects from conceptualization to successful launch. In my spare time, I enjoy experimenting with new Flutter features, exploring state management solutions like Provider or Bloc, and building user-friendly apps that streamline day-to-day tasks—ultimately striving to improve the quality of life for users everywhere.
I am a Senior Software Engineer with 5 years of experience in Flutter development, specializing in cross-platform mobile applications. I have expertise in UI/UX design, state management, and API integration.
Versatile Software Engineer with over 5 years of experience, offering a strong background in developing scalable applications across multiple platforms. Proficient in mobile (Kotlin, Java, Flutter/Dart and React Native), web (TypeScript, PHP), and cross-platform technologies. I am experienced in creating intuitive user interfaces and efficient development tools to streamline product development and scaling. Demonstrates excellent problem-solving skills, adaptability across various programming languages, and the ability to manage multiple projects while maintaining high code quality—strong communicator, capable of working independently or collaboratively in team environments.
I have a Bachelor's degree in Electrical Engineering, majored in Computer Sciences. My desire is programming, and that's what I've been doing for the past several years. Got around 10 years of experience working in a professional environment, as well as a few years before that working on some freelance and college projects. I'm great at debugging and have a thorough understanding of everything that I do. Don't like to leave something unraveled, so I always delve deeper until I get to the core of the matter that I'm working on. My passion for programming does not end there; I've tutored high-school students in my country Kotlin and Android, that's why I'd like to continue doing so here. I'm always looking to expand my knowledge, so I'm currently learning Flutter.
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