Divyang P.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I'm a Senior / Lead Mobile Application Developer with 12+ years of professional experience building, improving, and maintaining production-ready applications. My strongest expertise is Native Android development using Kotlin and Java, along with Flutter for cross-platform mobile applications. I also have hands-on experience with React Native, React.js, Next.js, Vue.js, Node.js, MongoDB, REST APIs, Firebase, and server deployment, allowing me to contribute across mobile, API, and admin-panel development. I can build applications from scratch, improve existing applications, fix complex bugs, modernize legacy codebases, develop new features, and support ongoing product development. 🚀 MOBILE APP DEVELOPMENT Android – Kotlin & Java • Native Android application development • New applications and existing application maintenance • Java / Kotlin development and Java → Kotlin migration • MVVM, Clean Architecture, Repository Pattern, SOLID • Jetpack Compose, XML, Material Design • Coroutines, Flow, LiveData, RxJava • Room, SQLite, PostgreSQL • REST API integration using Retrofit / OkHttp • Firebase, Firestore, Crashlytics • BLE / Bluetooth, Wi-Fi, USB and hardware communication • QR / Barcode scanning • GPS, Maps and location-based applications • Performance optimization, crash and bug fixing • Play Store deployment and release management Flutter • Flutter / Dart application development • Android and iOS applications from a shared codebase • REST API and Firebase integration • Existing Flutter application maintenance • Feature development, bug fixing and optimization Other Mobile Technologies • React Native • Third-party SDK and API integrations • Cross-platform application development 🌐 WEB, API & ADMIN PANEL I also have experience developing the backend and management side of applications: • Node.js REST APIs • MongoDB and PostgreSQL • Vue.js • React.js • Next.js • Admin panels and dashboards • Authentication and API integration • Firebase services • Nginx • Domain / subdomain and SSL configuration • Basic Linux/server deployment • CI/CD and deployment workflows I can work across a complete solution: Mobile App → REST API → Database → Admin Panel → Server 🔧 APPLICATION IMPROVEMENT & MODERNIZATION I can improve your existing application without unnecessary rewriting: • Java → Kotlin migration • Legacy code modernization • MVVM / Clean Architecture implementation • Code and logic optimization • ViewBinding / DataBinding migration • Coroutines / Flow implementation • Refactoring and architecture improvements • Code review • Bug and crash fixing • Performance optimization • Gradle / SDK / dependency upgrades • Firebase Crashlytics investigation • CI/CD improvements • Technical mentoring and guidance 🔌 HARDWARE, IoT & AUTOMOTIVE • BLE / Bluetooth communication • Wi-Fi and USB communication • Arduino and Raspberry Pi • Sensors and device control • Serial communication • Embedded module integration • Digital signage systems • AOSP / Android Automotive-related development • Vehicle / infotainment integrations 💼 APPLICATION & BUSINESS DOMAINS • eCommerce • POS / POP systems • Restaurant and food ordering • Healthcare • Retail • Digital signage / Signage TV • Enterprise applications • IoT / hardware-connected applications • Automotive / connected vehicle applications • Business management systems • Custom workflow applications 🤖 AI & MODERN DEVELOPMENT I use modern AI-assisted development tools including ChatGPT, Claude, Gemini, GitHub Copilot, OpenAI Codex, and prompt engineering to improve development speed, debugging, code quality, documentation, and development workflows. I can also help integrate AI capabilities into mobile, web, and backend applications. 👨‍💻 TEAM LEADERSHIP • Technical leadership • Architecture decisions • Code reviews • Sprint planning • Production issue management • Release coordination • Cross-functional collaboration • Mentoring junior and mid-level developers • Collaboration with product, design, QA and backend teams ⭐ YOU CAN HIRE ME FOR • Android development with Kotlin / Java • Flutter mobile development • Android / Flutter bug fixing • Java → Kotlin migration • API / Firebase integration • BLE / Bluetooth / hardware integration • React Native development • Node.js REST API development • Vue.js / React.js / Next.js admin panels • Existing application modernization • Performance optimization • Long-term mobile application maintenance • Complete mobile + API + admin solutions If you have an existing app, new feature, bug, API, or complete product requirement, I can help turn it into a practical, maintainable solution. #Android #Android Studio #Java #Kotlin #Flutter #Node.js #Vue.js #Next.js #React #MongoDB #QR Code Scanner #Barcode Scanner #E-commerce App #Chatting App #SignageTv #Online Food Ordering System #POS & POP System #Firestore Database #Firebase Storage #Firebase Crashlytics #Single Page Website #Admin Panel #Simple HTML #SSL Install #Nginx #Subdomain