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⚡ Backend systems should not become fragile over time; they must stay maintainable, scalable, and reliable as products grow. I am a Backend Engineer specializing in Java, Kotlin, and Spring Boot, focused on building production-grade systems where clean architecture, long-term maintainability, and stability are critical. I combine strong backend engineering practices with practical system design to create APIs and services that remain easy to extend, debug, and operate in real-world environments. Clients work with me when system quality, clean code, and scalable backend architecture matter, not just feature delivery. 🏆 Proven Engineering Approach ✔ Clean, maintainable backend architecture ✔ Production-focused development mindset ✔ Long-term scalability and reliability focus ✔ Clear communication and structured collaboration 🚀 Core Capabilities ☕ Backend Engineering with Java & Kotlin • Spring Boot application development • REST API design & implementation • Business logic architecture • Secure and maintainable backend systems • Performance-focused backend development 🏗 Scalable System Architecture • Microservice-based architectures • Modular and maintainable code structure • Service communication patterns • Production-ready backend design • Reliability and scalability optimization 🗄 Database & Persistence Engineering • PostgreSQL, MySQL, MongoDB • Hibernate / JPA / Spring Data JPA • Query optimization & data modeling • Relational and NoSQL database design ⚙ Development & DevOps Workflow • Docker-based environments • Git-based development workflows • Unit & integration testing • CI/CD-friendly project structures 🔍 Engineering Focus 🏢 Enterprise & Business Platforms Scalable APIs • backend services • maintainable systems 🚀 Startup Products & SaaS Platforms Fast iteration • clean architecture • long-term scalability 💡 Engineering Mindset • Architecture-first thinking • Clean and understandable code • Simplicity over over-engineering • Production reliability focus • Ownership from development to deployment • Long-term maintainability mindset 🧰 Technical Stack Java • Kotlin Spring Boot • Spring MVC • Spring Data JPA REST APIs • Microservices PostgreSQL • MySQL • MongoDB Hibernate • JPA Docker • Git ✨ Why Clients Choose Me ⭐ Clean and maintainable backend architecture ⭐ Scalable production-ready systems ⭐ Strong Java & Kotlin expertise ⭐ Clear communication & accountability ⭐ Reliable engineering mindset 🚀 Ready to Build Stable, Scalable Backend Systems? If you need a backend engineer who cares about clean architecture, maintainable systems, and production reliability, I am ready to help. Let us build backend systems that stay reliable, scalable, and easy to maintain long after launch.

I’m a mobile app developer with a strong native Android background and experience across Kotlin Jetpack Compose Flutter React Native Firebase and API driven mobile apps. I usually work with clients who need someone reliable long term someone who can take ownership keep the app stable and ship improvements consistently. I can help with Mobile app MVP development for Android and iOS Flutter React Native and native Android development Firebase Firestore Auth Storage and backend integrations API integration app architecture and data flow fixes Payment POS SDK and transaction flow integrations Bug fixing crashes performance issues and app cleanup Modern mobile UI with Compose Material design and clean UX Play Store and App Store launch preparation My working style is simple. I communicate clearly send frequent updates and focus on clean maintainable structure so the app is easy to improve later. If we work well together I’m open to an ongoing monthly setup fixed hours or retainer so you do not have to keep switching developers. If you share what you are trying to achieve whether it is a bug fix new feature MVP payment integration UI refresh or launch support I can suggest the fastest and cleanest way to move forward.

Give me a mobile app idea, and I’ll build it so it works for you 24/7. That’s my promise. Struggling to find a developer who understands both mobile product design and Flutter development? Tired of delays between designers and developers? I build complete mobile applications from UX strategy and Figma design to scalable Flutter code and App Store deployment — eliminating handoff friction and saving you time and money. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 𝗪𝗛𝗔𝗧 𝗜 𝗗𝗘𝗟𝗜𝗩𝗘𝗥 ▶︎ 𝗙𝗹𝘂𝘁𝘁𝗲𝗿 𝗠𝗼𝗯𝗶𝗹𝗲 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 End-to-end mobile development using Flutter. From UX flows and Figma prototypes to production-ready code and App Store / Play Store deployment. ▶︎ 𝗨𝗜/𝗨𝗫 𝗗𝗲𝘀𝗶𝗴𝗻 (𝗙𝗶𝗴𝗺𝗮) Clean, modern, and user-focused mobile interfaces designed in Figma. I create intuitive user flows, wireframes, and high-quality UI designs ready for development. ▶︎ 𝗠𝗼𝗯𝗶𝗹𝗲 𝗗𝗲𝘀𝗶𝗴𝗻 & 𝗦𝗰𝗿𝗲𝗲𝗻𝘀𝗵𝗼𝘁 𝗗𝗲𝘀𝗶𝗴𝗻 High-converting App Store & Play Store screenshots, pitch deck mockups, and mobile UI visuals designed to communicate your product clearly and professionally. ▶︎ 𝗠𝗩𝗣 𝗕𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗳𝗼𝗿 𝗦𝘁𝗮𝗿𝘁𝘂𝗽𝘀 Launch your idea fast with a scalable Flutter architecture. I build clean MVPs that can evolve into full products without rewriting the codebase. ▶︎ 𝗟𝗲𝗴𝗮𝗰𝘆 𝗠𝗼𝗯𝗶𝗹𝗲 𝗔𝗽𝗽 𝗠𝗼𝗱𝗲𝗿𝗻𝗶𝘇𝗮𝘁𝗶𝗼𝗻 Outdated UI or messy codebase? I redesign and refactor existing apps with modern Flutter architecture while maintaining your user base. ▶︎ 𝗠𝗼𝗻𝗲𝘁𝗶𝘇𝗮𝘁𝗶𝗼𝗻 & 𝗔𝗦𝗢 In-App Purchases, subscriptions, AdMob, and Stripe integration. Plus App Store Optimization (ASO) including keywords, screenshots, and conversion-focused store assets. ▶︎ 𝗔𝗽𝗽 𝗦𝘁𝗼𝗿𝗲 & 𝗣𝗹𝗮𝘆 𝗦𝘁𝗼𝗿𝗲 𝗟𝗮𝘂𝗻𝗰𝗵 Full submission handling: App Store Connect, Google Play Console, privacy policies, SDK compliance, and rejection prevention. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ▶︎ 𝗧𝗘𝗖𝗛 𝗦𝗧𝗔𝗖𝗞 Mobile Development Flutter • Dart • Kotlin • Swift Backend & APIs Firebase • Supabase • Node.js • REST APIs Database SQLite • MySQL • Firebase Firestore Monetization In-App Purchases • RevenueCat • AdMob • Stripe Design & UX Figma • User Flows • Wireframes • Mobile UI/UX Design • Screenshot Design • ASO Strategy Architecture Clean Architecture • MVVM • Git/GitHub ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ▶︎ My Process 🟢 Strategy & App Planning I analyze your app idea, target users, and competitors before development begins. 🟢 Mobile UX & UI Design Clean, intuitive mobile interfaces designed in Figma with real implementation in mind. 🟢 Flutter Development & Testing Scalable apps built with Clean Architecture and tested across devices and OS versions. 🟢 App Store Launch & Growth ASO optimization, store screenshots, submission process, and post-launch improvements. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ▶︎ Why Clients Choose Me 🟢 Flutter Specialist Focused expertise in mobile development with scalable architecture and performance-optimized apps. 🟢 Design + Development Approach I design mobile interfaces with development constraints in mind, which speeds up delivery and avoids costly redesigns. 🟢 Revenue-Focused Apps I integrate monetization and ASO from day one so your app doesn’t just launch — it generates revenue. 🟢 Transparent Communication Clear timelines, honest feedback, and proactive updates throughout the project. 🟢 App Store Expertise Privacy policies, SDK requirements, permissions, and rejection prevention handled properly. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ▶︎ Let’s Build Your Mobile App Whether you need a Flutter MVP, mobile app redesign, UI/UX design in Figma, screenshot design, ASO optimization, or a full App Store launch, I’m here to turn your idea into a working product. Click “Invite” and let’s discuss your mobile app.

I’m a Native Mobile Developer with over 4 years of experience building iOS (Swift, SwiftUI) and Android (Kotlin, Jetpack Compose) apps from scratch and improving existing codebases. I work with startups and businesses to deliver reliable, scalable mobile apps built natively, with clean UX and long-term maintainability in mind. Core Skills Swift · SwiftUI · Kotlin · Jetpack Compose · REST APIs · Firebase · Superwall · MapKit · Google Maps SDK · Push Notifications · AdMob · In-App Purchases · Payments (Stripe / Iyzico) · App Store Connect & Play Console What I Do • End-to-end mobile app development (UI, business logic, backend integration, App Store Connect & Play Store submission) • Building new apps from scratch and refactoring, fixing, or extending existing applications • Clean, maintainable MVVM architecture • Handling App Store review issues, rejections, and resubmissions • Post-launch support, feature improvements, and performance optimization

Hello! I am expert Backend Developer with almost 20 years of experience in backend, Android mobile, desktop apps, apps for embedded devices, ERP apps and web development. Proficient in developing applications in wide range of areas, including business applications and database management. Have high attitude expertise in Linux OS management, including building automated servers with set of services/tools for different purposes, virtualization tehcnologies like KVM/libvirt, containerization technologies like LXC, Docker, Kubernetes. What I can do: - Planning and implementing the app’s architecture and features. - Writing apps from the very scratch and further support. - Code Review, Fixing and supporting the apps written by others. - Working with a team of developers or solo. Technical Skills: * Languages and Frameworks: Java (Spring, Quarkus, Dropwizard....), Kotlin, C, C++, Qt, Rust, Go, Python (Django), JavaScript, PHP * Platforms: Backend, Android, Linux (Fedora, RedHat, CentOS, Ubuntu) * Technologies: Docker, Kubernetes, CI/CD, Mobile Development, Docker, KVM, libvirt, IT infrastructure monitoring tools, AWS services, GCP * Database Management: PostgreSQL, SQLite, MySQL.... - I'm open to working with big and small companies and individual clients. - I'm comfortable signing an NDA. - Prefer long-term collaboration. - Ready to work 30-60 hours per week I'm open to various projects and would love to show you my creative side too. My commitment to continuous learning keeps me updated with the latest trends and technologies, allowing me to bring cutting-edge solutions to your projects and better expreince. I am giving high attention to details, ready to resolve complicated and complex challenges, always tend to offer most efficient solution. Thanks for your time Regards Rafael S.

I've been into coding since I was 13 years old and I currently work as a full-time Flutter developer. I have experience in Firebase auth-storage-database-functions, Bluetooth Classic, Bluetooth Low Energy, Provider, Riverpod, GetX, Kotlin, Python, Javascript, REST APIs, Web Scraping, WebView, Git, Hive etc.