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💼 Senior Full-Stack Developer | 10+ Years of Experience | React Native | Flutter | Swift/Kotlin | NodeJS | VueJs | NestJS | SwiftUI | JetCompose | Firebase | Supabase | Mobile Apps | BLE | GPS | Maps | Scalable Systems | Mobile App Development | AI Mobile App Development | Flutter App Development | React Native App Development | iOS & Android App Development | Full Stack Mobile App Development | Kotlin | Swift | SwitUI | JetCompose | Firebase | REST APIs I am a Senior Full-Stack Developer with 10 + years of experience building high-quality, scalable, and pixel-perfect applications using React Native, Flutter, Swift, Kotlin, NodeJS, Express, NestJS, React, and Vue.js. -- specialize in cross-platform mobile apps, native iOS/Android apps, backend APIs, BLE integrations, real-time systems, mapping, GPS, IoT, and end-to-end product development. If you need a fast, reliable, and experienced developer who can take your idea to production-level quality, I can help. Let’s bring your app idea to life with AI-driven innovation, seamless UX/UI design, and robust scalable architecture. Senior Mobile App Development | Web Development | iOS Android | Flutter RN | React Native | SDK Web dev | Kotlin | Swift | SwiftUI | JetCompose ⭐ Why Clients Hire Me⭐ ✔ 10+ years of experience ✔ End-to-end process: Idea → MVP → Launch → Scaling ✔ Clean, maintainable code (SOLID, MVVM, best practices) ✔ Expertise in AI integrations for smarter user experiences ✔ Full transparency, agile workflow, and long-term partnership ✔ Flexible engagement: fixed-price or hourly ✔️ Fast and scalable delivery ✔️ Clear communication & fluent English ✔️ Clean, well-documented code ✔️ Budget-friendly without sacrificing quality ✔️ Self-managed and deadline-driven ✔ Pixel-perfect UI from Figma ✔ Bug-free, scalable, clean code architecture ✔ Expertise in native (Swift/Kotlin) + cross-platform (React Native/Flutter) ✔ Strong backend experience with Node.js & NestJS ✔ API design, integrations & automation ✔ Performance optimization & code refactoring ✔ OTA updates, CI/CD, deployment (App Store & Play Store) 🛠️ 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 I Work With 🚀 Mobile App Development - React Native, Expo, React Navigation - Flutter, Dart - Swift, SwiftUI, UIKit - Kotlin, Jetpack Compose 🚀 Backend & Full-Stack - Node.js, Express.js, NestJS - MongoDB, Firestore - Firebase Authentication / Firestore / FCM - REST APIs, Realtime DB, Cloud Functions - CI/CD pipelines (Fastlane, GitHub Actions) 🚀 Advanced Integrations - Google Maps, GPS tracking, Geofencing - Bluetooth & BLE (IoT apps) - Payment gateway integration - WebSockets & real-time messaging - Push notifications - Deep linking - Third-party API integration - APIs: REST, GraphQL - AI Tools: OpenAI (GPT), TensorFlow, Computer Vision, Google Gemini, Deepseek 🧩 Industries & Projects I Have Built I have successfully delivered apps in multiple domains: 🎟 Event & Ticket Booking Apps 🍔 Food Delivery & On-Demand Apps 🚖 Taxi Booking & Ride Sharing Apps 🏏⚽ Sports Apps (Cricket & Football) 💇‍♀️ Beauty Service Apps 💬 Real-Time Chat & Video Calling & Social Apps 💘 Dating Applications 🎮 2D Games 📍 GPS & Location Tracking Systems 📡 IoT & BLE-based Apps 🎁 Loyalty Points & Rewards Apps & Coupon Apps 📱 MVP App Development for Startups 💪 Health, Fitness & Meditation Apps ✈️ Travel & Ticket Booking Apps 🗂️ Productivity & Task Management Apps My experience helps me understand both product and technical requirements, ensuring smooth delivery and long-term maintainability. ⭐ Let’s Build Something Great If you need a senior, reliable, and long-term developer who can ship high-quality products, feel free to message me. I’m available for new projects, long-term cooperation, or part-time support. 📞 Schedule a free consultation — click Invite or Message to get started. Thank you, Avtar Singh Mobile App Development, Flutter App Development, Cross-Platform Mobile App Development, Hybrid App Development, Mobile App Design, Android App Development, iOS App Development, Real Estate App Development, Food Delivery App Development, Dating App Development, AI Mobile App Development, Full Stack Mobile App Development, Mobile App Consultation, Mobile App Development Specialist, Native (iOS & Android) Developer, AI Mobile App Expert, Full Stack Developer

✅ 100% Job Success | Top Rated on Upwork 📊 49 Jobs | 5,025+ Hours Worked | 5★ Reviews 🏆 Certified by the Government of Mauritania (World Bank Projects) 👨‍💻 10+ Years’ Experience in Native Mobile App Development 🚀 Specialising in Automotive, BLE, IoT, HealthTech, Wearables 🤖 Fun Fact: I use AI tools like ChatGPT & Copilot to speed up development & debugging. 🔧 Core Tech Stack Android (Kotlin/Java): • Jetpack Compose, AndroidX, RxJava, Coroutines • Hilt, Dagger, Room, WorkManager • Material Design, ConstraintLayout, MotionLayout • Testing: Espresso, Robolectric, JUnit iOS (Swift/Obj-C): • SwiftUI, UIKit, Combine, CoreData, AVFoundation • MapKit, Vision, CoreML, SiriKit • Tools: Xcode, Instruments, Fastlane, SwiftLint • Testing: XCTest, XCUITest 🚘 Automotive & Multimedia • Android Auto & Apple CarPlay • MediaBrowserService, ExoPlayer, AVPlayer • Turn-by-turn SDKs: Google Maps, Mapbox, HERE • Voice Assistants: SiriKit, Google Assistant 📶 IoT, BLE & Connectivity • BLE, Classic Bluetooth, CoreBluetooth • Nearby Connections, WiFi Direct • MQTT, WebSockets, IoT Device Sync ☁️ Cloud, APIs & Backend • Firebase (Auth, Firestore, FCM, Remote Config) • Supabase, AWS Amplify, AppSync • REST APIs, GraphQL, Retrofit, Apollo • Local Storage: Room, CoreData, SQLite 💰 Monetization & Notifications • RevenueCat, StoreKit, Google Billing • FCM, APNs, PushKit, Local Notifications 🧱 Architecture & Clean Code • MVVM, Clean Architecture, Repository Pattern • SOLID Principles, Modular Codebases • DI Tools: Hilt, Dagger 🚀 Deployment & CI/CD • Play Console, App Store Connect • Fastlane, Bitrise, Firebase Distribution • GitHub Actions, Code Signing, TestFlight 🧠 Advanced Features • Geolocation, Geofencing, Biometric Auth, Background Services • Deep Linking, App Clips, Widgets, Spotlight, Siri Shortcuts • WatchOS, WearOS, HealthKit, Google Fit • Accessibility, RTL, Multilingual Support 🏅 Certifications Government of Mauritania – World Bank Projects Android Jetpack Masterclass – Udemy (Feb 2025) iOS SwiftUI Mastery – Simplilearn (Feb 2025) Agile Scrum Master – Simplilearn (Feb 2025) Firebase Essentials – Google Developer Training BLE & IoT Mobile Integration – Coursera 🤝 Why Clients Choose Me ✔️ 100% Job Success + Top Rated + Long-Term Clients ✔️ Native-first with Automotive, BLE & Wearable Expertise ✔️ Fast Delivery, Clean Code, Agile Collaboration ✔️ Sharp UI/UX & Robust Architecture for Scaling 📌 Let’s bring your mobile app idea to life — with speed, quality & clarity. #Kotlin #Swift #JetpackCompose #SwiftUI #AndroidAuto #CarPlay #BLE #Firebase #RevenueCat #WearOS #WatchOS #GraphQL #RoomDB #Fastlane #GitHubActions #MobileDev

I appreciate you visiting my profile and taking the time to go through it. I am Ravinder Kumar Senior Mobile App Developer more than 15+ years of experience in Mobile development. -----------------My Technical Experience ---------------------- 𝗠𝗢𝗕𝗜𝗟𝗘 𝗧𝗘𝗖𝗛𝗡𝗢𝗟𝗢𝗚𝗜𝗘𝗦: Swift, Kotlin, Flutter. 𝗕𝗔𝗖𝗞𝗘𝗡𝗗: Node.js, Laravel, CodeIgniter, AWS, Nginx, Docker, Azure. 𝗗𝗔𝗧𝗔𝗕𝗔𝗦𝗘𝗦: MongoDB, PostgreSQL, MySQL, SQLite. 𝗙𝗥𝗢𝗡𝗧𝗘𝗡𝗗: Laravel, JavaScript, Angular, jQuery, Bootstrap, SASS, HTML5, CSS3 ➜ Native iOS Apps: Swift ➜ Native Android Apps: Kotlin, Java, Android Studio, and Android SDK ➜ Hybrid/Cross-platform Apps: Flutter and React Native ➜ Strong knowledge of iOS SDK and main frameworks, including UIKit, AVFoundation, HealthKit, SpriteKit, etc. ➜ Strong knowledge of Android Architecture Components (LiveData, ViewModel, DataBinding, etc) and Dagger framework. ➜ Experience with Google’s Firebase, including Crashlytics and FCM (Firebase Cloud Messaging), as well as push notifications ➜ Experience with integration of payment gateways such as PayPal, Stripe, Braintree, Square, Authorize.Net, Apple Pay, Google Pay, Amazon Pay, Razorpay, etc ➜ Proficient with Google’s Firebase, including Crashlytics and FCM (Firebase Cloud Messaging), as well as push notifications ➜ Proficient with online map SDKs and libraries such as Google Maps SDK, Mapbox SDK, Apple Maps SDK, MapKit, OpenStreetMap, etc ➜ Proficient with WebRTC SDKs like Google WebRTC, Twilio, Sendbird, Agora etc. --------------------Technical Skills------------------ ➜ Social Networking Apps ➜ E-commerce Apps ➜ BLE & IoT Apps ➜ Health and Fitness Apps ➜ Travel and Tourism Apps ➜ Education and E-Learning Apps ➜ Entertainment and Media Apps ➜ Financial Services Apps ➜ Food and Delivery Apps ➜ On-Demand Services Apps ➜ Utilities and Tools Apps ✅ 100% Job Success. ✅ 10000+ Hours Worked. ✅ Top Rated Badge Holder. ✅ 15+ years of Experience Mobile App Development ✅ 24/7 Availability

👋 About Me I am a Senior Full-Stack Software Engineer and Mobile Developer with 7+ years of experience building scalable web applications, native mobile apps, and intelligent backend systems. I have a proven track record of delivering secure, high-performance, and automated solutions across healthcare, government, e-commerce, and real-time systems. My core strength is my multi-stack versatility. I build robust backends using Python (Django, FastAPI, Flask) and Node.js, design dynamic frontends using React and Next.js, and engineer high-performance native mobile apps using Kotlin and Jetpack Compose. Additionally, I implement cutting-edge Agentic AI workflows, LLM integrations, and RAG-based applications to automate business processes. From handling high-throughput government platforms to setting up secure healthcare applications, I focus on clean architecture, performance optimization, and production-ready code quality. 🛠️ Core Technical Stack - Web & Full-Stack: React.js, Next.js, Node.js, TypeScript. - Backend Development: Python (Django, FastAPI, Flask), Java (SpringBoot), REST APIs. - Mobile Development: Android SDK, Kotlin, Java, Jetpack Compose, MVVM, Clean Architecture. - AI & Automation: Agentic AI Solutions, Google ADK, OpenAI Integration, Web Scraping (Selenium), RAG-Based Applications. - Databases & Cloud: PostgreSQL, MySQL, MongoDB, SQLite, Firebase Services, GCP Cloud Functions. - Tools & Platforms: GitHub, GitLab, Bitbucket, Docker, Jenkins (CI/CD), Jira, Azure DevOps. 🤝 Why Clients Work with Me -True Full-Stack Capability: I can seamlessly connect your React/Next.js frontend, Node.js or Python backend, and native Kotlin mobile app without needing to hire a separate developer for each layer. - AI & Automation Expertise: I don't just build basic apps; I inject efficiency into your business workflows using Agentic AI, tools integration, and smart automation. - On-Time & Within Budget: Awarded the Engineering Excellence Award for driving innovative solutions and delivering high-impact projects reliably. 💬 Let’s Work Together I offer a free consultation to discuss your idea, requirements, or existing app improvements. Let’s build a reliable, high-quality Android application that delivers real business value 🚀

𝗣𝗿𝗼𝘃𝗲𝗻 𝘁𝗿𝗮𝗰𝗸 𝗿𝗲𝗰𝗼𝗿𝗱: 25+ production-ready apps built with Flutter & Firebase, published 14+ Native Android Apps, generating over 8 figures in revenue 𝗘𝘅𝗽𝗲𝗿𝘁 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝘆: CI/CD automation, clean architecture, and reliable app store publishing 𝗘𝘅𝘁𝗿𝗲𝗺𝗲𝗹𝘆 𝗥𝗲𝗹𝗶𝗮𝗯𝗹𝗲, 𝗖𝗼𝗺𝗺𝘂𝗻𝗶𝗰𝗮𝘁𝗶𝘃𝗲 𝗮𝗻𝗱 𝗙𝗮𝘀𝘁: Regular updates, clear milestones, and proactive collaboration 𝗘𝗻𝗱-𝘁𝗼-𝗲𝗻𝗱 𝘀𝘂𝗽𝗽𝗼𝗿𝘁: From Figma design to post-launch maintenance • Reliable support after launch I've had the privilege of propelling clients to significant milestones, including 2 production mobile apps with real users and measurable business impact. Some notable successes include: - A restaurant management app helping streamline dining operations and enhance customer engagement through a seamless mobile experience - A ride-sharing app supporting driver, customer workflows and transportation operations with a reliable, user-friendly mobile platform I’m a Flutter & Android (Kotlin) developer with 𝟳+ 𝗬𝗲𝗮𝗿𝘀 𝗼𝗳 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 delivering production-ready mobile apps. AI speed combined to deliver code that ships fast, feels premium, and scales without cracking. (Available for 2 projects in July 2026) • End-to-End Expertise: Flutter (iOS & Android) and native Android (Kotlin) development - from UI/UX design (Figma-to-code) to back-end integration and deployment. • Modern Architecture: Implement MVVM/Clean Architecture and Jetpack Compose for maintainable, scalable code, integrate Firebase, REST/GraphQL APIs, payment gateways (Stripe/PayPal) and 3rd-party SDKs. My core expertise: • Flutter App Development (Android & iOS) • Native Android development using Kotlin • MVP Development for Startups • AI-Powered Mobile Applications • Firebase Integration (Authentication, Firestore, Realtime Database, Cloud Messaging (FCM), Crashlytics, Remote Config, Cloud Storage ) • REST API & Third-Party SDK Integration (GraphQL, Node.js, Firebase Cloud Functions, Supabase, WebSockets, Twilio) • Payment Gateway Integration (Stripe, Razorpay, PayPal, Google Play Billing, Apple In-App Purchase, RevenueCat) • Maps, Geolocation & Real-Time Tracking (Google Maps SDK, geolocation, geofencing, live tracking, route optimization ) • Chat, Notifications & Real-Time Features • Figma to Flutter / Android • Google Play Store & Apple App Store Deployment I'm a mobile app developer who builds full apps from scratch in both Flutter and native Android (Kotlin), extends existing Flutter apps with custom native Kotlin modules when a plugin falls short, and has particular depth in two-sided marketplace apps, platforms connecting two different types of users (clients/professionals, hosts/guests, buyers/sellers) with booking, messaging, and payments built to work cleanly for both sides. Tech Stack: Flutter • Dart • Kotlin • Firebase • Supabase • REST APIs • SQLite • Room Database • Stripe • Google Maps • Push Notifications • Riverpod • BLoC • GetX • Jetpack Compose • Kotlin Coroutines & Flow • Hilt/Dagger • Android SDK • Git • GitHub • Figma Message me "AUDIT" - get a free 30-min technical consultation. During our session, we’ll:
 ✅ Explore your goals, technical requirements, or existing app review feedback ✅ Outline a roadmap with timelines and cost estimates
 ✅ Recommend the best tech stack and development approach 🤝 𝗟𝗘𝗧'𝗦 𝗪𝗢𝗥𝗞 𝗧𝗢𝗚𝗘𝗧𝗛𝗘𝗥

I have been developing mobile applications from the last 12 years. I have developed several applications and helped many businesses with my solutions. Below are some of my past developed Android and iOS application domains: - Restaurant App - Events - Health & Fitness - Healthcare - On-demand - Service provider - Video/photo editing, - IoT, Bluetooth - Dating/ Social networking and many more I have worked on following technologies: - Objective C/Swift - Java/Kotlin - PayPal/Stripe/Braintree & Other Payment Gateway Integration - Google Maps/Mapbox/MapKit - Social Media SDK's like Facebook, Twitter, Instagram, Google+, Snapchat, etc - Restful/SOAP API's Development - Analytics like Google Analytics, Clevertap, Amplitude, Flurry, etc. - Design Patterns: Test-driven Development (TDD), Model View View Model (MVVM), Model View Controller (MVC), Model View Presenter (MVP) - CI/CD tools: Fastlane, CircleCI CONCEPTS • Good Experience with Agile Development • Object-Oriented-Programming Algorithms, Data Structure, Analytical skills and Problem solving MANAGEMENT Tools • Communication - Slack, Zoom, Hangout and Skype • Project Management - Jira, Trello and Basecamp • Tracking - Clickup