MY SKILLS: * Platforms: iOS, iPadOS, watchOS, macOS * Languages: Swift, Objective-C, Dart & Flutter * Frameworks: UIKit, SwiftUI, MapKit, CoreLocation, AVKit, StoreKit etc * Databases: Core Data, CoudKit, Realm, Firebase, SQL, ObjectBox, Parse * Other Libraries/frameworks: AWS, AFNetworking/AlamoFire, SDWebImage, Vapour, SnapKit, Sourcery, SwiftGen & more * Source Control: Git, GitHub, Bitbucket. MY EXPERIENCE: * Programming since 2010 * Releasing iOS apps since 2014 * Freelancing on Upwork since 2016 * Top Rated freelancer since 2016 "Top Rated Plus is our way of highlighting freelancers and agencies who consistently perform on large contracts at the highest level." * Expert Vetted since 2023 "Expert-Vetted Talent is the top 1% — pre-screened by our Talent Managers and experts in their field." (this badge is only visible to Enterprise clients). * 100% Job Success Score since 2016 * Clients who would recommend me according to Upwork statistics: 98% * 62 completed contracts, 52 5 star reviews, 3 ~4.50 star reviews, 7 no feedback given * I estimate over 15,000 hours of coding experience creating apps and libraries for clients, my business and for fun * 8 apps published under my own developer account * 40+ apps released or updated for clients MY SERVICES: * Developing New Apps: Bring your ideas to life, whether you have a fully fleshed-out design or just a rough concept. I can work with you from the pre-development stage to app store release and beyond. * Enhancing Existing Apps: Improve your app by fixing bugs and implementing new features. If you're unsure about what needs to be done, I can review the code, identify problem areas, provide a full report and an estimate for you to decide on priorities and budget. * Consulting: Benefit from my expertise to guide you through the development process, ensuring you make informed decisions and achieve your project goals. * AI Generated Code Consultations: If you've been building your own app using AI to generate the code and have gotten stuck or need help, I can review the code and guide you to the next steps. MY WORKING STYLE: * Communication: I maintain clear and open communication for successful collaboration. I'm flexible with using Upwork, Slack, Zoom, Email, Phone, etc., as long as it complies with Upwork's rules. * Architecture: I write modular and S.O.L.I.D. code for better maintainability and reusability. * Unit Testing: I write unit tests to ensure app stability and maintainability, reducing development costs and improving app performance.

✅Top Rated Plus ✅10+ Years of Experience ✅100% Job success score I am Sagarkumar , a Senior Mobile and Web App Developer with 10+ years of experience in Mobile and Web application Development I have worked with big brands, startups and individuals to create mobile apps for their requirements. I have worked on more than 200+ projects successfully. Many of my developed apps featured in app-store and play-store I have worked with clients from all over the world , such as the USA, UK, Germany, India, and Australia, which has given me a strong understanding of different international markets. I have worked with different Industries including Travel and Tourism, train ticket booking, transport, educational, hospitality, health & wellness, real estate, live streaming, Marketplace, food & delivery, human resources, fitness, financial & banking sectors, e-commerce, dating, sports, Betting, music/audio, and automotive. I specialized in these high-quality Mobile App Design and Development areas: - Android app development - Kotlin, Java, Android SDK, Android Studio - iPhone app development - Swift, SwiftUI, Objective C, iOS SDK, Xcode - Backend Development | Node.js - Cross Platform Mobile App Development using Flutter, Dart - UI/UX: Mobile design - Mobile & Web app design - UX/UI design Web applications: Backend Technologies: Node.js, Nest.js, TypeScript, JavaScript, Express.js, AWS, MongoDB Frontend Technologies: React, Flutter, HTML, CSS Database Management: MySQL, PostgreSQL, JSON, Database Schema Design Architectural Patterns: MVC, Event-Driven Architecture, Serverless Architecture, Clean Architecture, GraphQL Web Services & APIs: RESTful API development, Firebase Cloud Messaging, In-App Purchase Integration Code Optimization: Performance tuning, Design patterns, Material Design, Custom UI Elements, Animation Cloud Services: Firebase Analytics, Database, Storage, Hosting, Crash Reporting, AWS, DigitalOcean Social Integrations: Facebook, Twitter, Google SDK Skills : - Have experience developing, releasing & maintaining applications as a Mobile app developer - Strong skills in executing pixel & animation perfect UI's relative to good app performance - Have great communication skills and ability to work with your team - Have a great understanding of MVC, MVP, MVVM and take great care to ensure each project is well-architecture with best practices and easily maintainable so it can be enhanced as feature grows. - The ability to take initiative and work independently with very little supervision - Application requirement analysis - Translating requirements to technical languages In addition to Mobile app development services, my topic areas of expertise include: - Mobile Application Architect - Native Mobile Application Development consultation - Mobile Application UI/UX design using Figma, Adobe XD - Mobile Application backend services Firebase, AWS Mobile Hub - Mobile Application backend development: Node, Express, TypeScript, JavaScript, MongoDB, MySQL, PHP, RESTful API development, Google App Engine - Website development, Web Scraping, Web Admin Panel, CMS Development - Chatbot development, Facebook Messenger Additional: -Alamofire, SDWebImage, Cocoapods, SQLite, Core Data, Project Management tools: - Jira, Asana, Trello, Clickup If you still think this is right for you, contact me. Thank you in advance for your time and consideration. P.S. - When you work with me your satisfaction is 100% guaranteed. - Every person who ever worked with me got results. EVER! - Even if you don’t hire me now, keep my profile link in case you need a Mobile App Developer later. FAQ Can you provide maintenance support after development? Yes, I provide free of cost maintenance support for 3 months after mobile app development. Can you help with Design? Yes, I offer a UX design as an additional service. Can you help with the landing page website for my mobile app product? • ⁃ Yes, I can help to build the landing page for a mobile app product.

𝟏𝟎𝐌+ 𝐀𝐩𝐩 𝐃𝐨𝐰𝐧𝐥𝐨𝐚𝐝 | Solid Experience in 𝐢𝐎𝐒 (𝐒𝐰𝐢𝐟𝐭, 𝐒𝐰𝐢𝐟𝐭𝐔𝐈) & 𝐅𝐥𝐮𝐭𝐭𝐞𝐫 | 𝟗𝟎+ 𝐀𝐩𝐩𝐬 𝐋𝐚𝐮𝐧𝐜𝐡𝐞𝐝 | Long-Term Supporter | 𝐖𝐨𝐫𝐤𝐞𝐝 𝐰𝐢𝐭𝐡 𝐋𝐞𝐚𝐝𝐢𝐧𝐠 𝐂𝐨𝐦𝐩𝐚𝐧𝐢𝐞𝐬 (Hims & Hers 🇺🇸, Insight Timer 🇦🇺, Asafeer Education 🇦🇪, Cal AI 🇺🇸) | Accepting Limited Projects Hi, I’m Nirav, a Mobile App Developer with 10+ years of experience creating high-quality iOS and Android applications. With strong expertise in Swift, SwiftUI, and Flutter, I help businesses design, develop, and launch high-performance mobile apps and MVPs that are scalable, easy to maintain. I enjoy working closely with founders, startups, and product teams to transform ideas into successful mobile applications. I believe great products come from strong collaboration, so I take the time to understand business goals, user needs, and technical requirements before writing a single line of code. Beyond development, I provide practical technical guidance, proactive problem-solving, and clear communication throughout the entire project lifecycle. My clients value my reliability, transparency, and commitment to long-term partnerships. 🚨How I Work ✅ I take on only a few projects at a time so I can stay focused ✅ I write code very high scalable & easy to maintain for long term ✅ I pay close attention to pixel perfect UI integration, user experience & animations. ✅ 50+ mobile apps delivered across Health, EdTech, FinTech, E-commerce, Sports & AI ✅ Worked with Top Companies (Insight Timer 🇦🇺, Asafeer Education 🇦🇪, Hims & Hers 🇺🇸) 🚀 Technical Expertise - iOS Development, Android Development, Swift, SwiftUI, Flutter, Dart, Cross-Platform Mobile Apps, iPhone, iPad, Tablet Apps - Firebase, Supabase, PostgreSQL, MySQL, MongoDB, AWS, Google Cloud Platform (GCP), Cloud Run, Cloud Functions, AppSync - REST APIs, GraphQL APIs, Edge Functions, Cloud Functions, Background Tasks, Push Notifications, Deep Linking, Offline Sync - In-App Purchases (IAP), Subscriptions, RevenueCat, Superwall, Adapty, Stripe, Apple Pay, Google Play Billing, Payment Gateway Integration - Mixpanel, Firebase Analytics, AppsFlyer, Branch, Funnel Analysis, Conversion & Retention Tracking - AI App Development, OpenAI, Gemini AI, Claude AI, AI Chatbots, AI Agents, AI/ML Features, OCR, Speech-to-Text, Image Recognition - Mobile App Performance Optimization, Memory Optimization, Battery Optimization, App Startup Optimization, Smooth Animations, Pixel-Perfect UI, Responsive Design - CI/CD, Fastlane, GitHub Actions, Bitbucket Pipelines, Automated Testing, TestFlight, App Distribution - Apple App Store, Google Play Store, App Store Optimization (ASO), App Publishing, App Review Support, Bug Fixing, Maintenance, Feature Development, Long-Term Support, App Scaling If you’d like to start with a weekly trial to see how we work together, I’m completely comfortable with that. It gives you a chance to evaluate my performance. 🚀  𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 𝐈 𝐞𝐧𝐣𝐨𝐲 𝐰𝐨𝐫𝐤𝐢𝐧𝐠 𝐨𝐧 - Startup MVPs & early-stage products - AI based mobile apps & SaaS platforms - Subscription & SaaS Products - Apps that need scaling, refactoring, or performance improvement - Long-term products that need a reliable technical partner 💚  𝐖𝐡𝐚𝐭 𝐲𝐨𝐮 𝐜𝐚𝐧 𝐞𝐱𝐩𝐞𝐜𝐭 𝐟𝐫𝐨𝐦 𝐦𝐞 - Clear and honest communication throughout the project - Thoughtful technical suggestions to improve your product - Long-term support, bug fixes, and enhancements when needed 👋 𝐋𝐞𝐭’𝐬 𝐭𝐚𝐥𝐤 If you’re looking for someone who treats your app like their own and is committed to quality from day one, I’d be happy to connect and discuss how I can help. Cheers, Nirav 🔑 𝐅𝐢𝐧𝐝 𝐌𝐞 𝐔𝐬𝐢𝐧𝐠 𝐓𝐡𝐞𝐬𝐞 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬: Flutter Developer | Flutter Expert | Senior Flutter Developer | Mobile App Developer | iOS Developer | Swift Developer | SwiftUI Developer | Android Developer | Cross-Platform App Developer | Full Stack Mobile App Developer | AI App Developer | AI Mobile App Developer | SaaS Developer | MVP Developer | Startup MVP Development | Mobile App Development | iPhone App Development | Android App Development | Flutter App Development | iOS App Development | Native iOS Development | Mobile Application Development | Custom Mobile App Development | Firebase Developer | Supabase Developer | AWS Developer | Google Cloud Developer | REST API Integration | GraphQL | Backend Development | AI Chatbot Development | OpenAI API | Gemini AI | Claude AI | OCR Integration | Speech-to-Text | Push Notifications | Stripe Integration | RevenueCat | Superwall | Adapty | In-App Purchases (IAP) | Subscription App Development | App Performance Optimization | App Scaling | App Refactoring | Bug Fixing | Code Review | App Store Deployment | Google Play Deployment | Healthcare App Developer | Fitness App Developer | FinTech App Developer | Education App Developer

iOS, Android & Windows App Development Expert | Swift | SwiftUI | C# | Kotlin | VPN | API Integration | Firebase | VoIP | Screen Time | IAP | Maps | Chat | ARKit | Sockets | Leaflet | AppClip | NFC Are you in need of a seasoned iOS, Android app or web developer to bring your ideas to life? Look no further! With 10 years of extensive experience in iOS or Android app development, I offer a comprehensive skill set that includes: ✅ Swift Expertise: Proficient in Swift programming language to ensure robust and efficient app development. ✅ GitHub Proficiency: Skilled in version control using GitHub for seamless collaboration and code management. ✅ Payment Gateway Integration: Capable of seamlessly integrating various payment gateways to facilitate secure transactions within your app. ✅ Apple Human Interface Guidelines Adherence: Committed to crafting visually stunning and user-friendly interfaces that align with Apple's design principles. ✅ Frameworks and APIs: Proficient in leveraging frameworks like UIKit, Foundation, and CocoaTouch, as well as utilizing APIs to extend app functionality. ✅ UI/UX Design: With a keen eye for design, I ensure that your app not only functions flawlessly but also offers an intuitive and delightful user experience. I am dedicated to collaborating closely with my clients to understand their unique requirements and deliver tailored solutions that exceed expectations. Let's discuss your project requirements and kickstart the journey towards creating an exceptional iOS app! Feel free to reach out, and let's make your vision a reality.

Senior iOS Developer with 8+ years of hands-on experience building, maintaining, and scaling high-quality iOS applications using Swift, SwiftUI, UIKit, and Objective-C. I specialize in developing production-ready mobile apps with clean architecture, smooth user experience, and reliable performance. I have strong experience with Firebase, Firestore, Cloud Functions, REST APIs, in-app purchases, subscriptions, Apple Sign In, push notifications, Core Data, Realm, widgets, BLE, and App Store release workflows. In addition to native iOS development, I also have experience working with Chromium-based projects, WKWebView-heavy applications, browser-style features, custom web-to-native integrations, JavaScript bridge communication, deep links, and hybrid app flows. This allows me to handle complex projects that combine native iOS performance with embedded web/browser functionality. I can help you with: - Building iOS apps from scratch using SwiftUI or UIKit - Refactoring and improving existing iOS codebases - Fixing complex bugs and performance issues - Firebase, Firestore, Authentication, Cloud Functions, and Push Notifications - In-app purchases, subscriptions, and payment-related flows - REST API integration and real-time data synchronization - Core Data, Realm, offline storage, and local caching - Chromium-based features, WKWebView, JavaScript bridge, and hybrid app flows - BLE, Apple Sign In, widgets, and native iOS features - TestFlight, App Store submission, and production release support - UI polishing based on Figma or existing designs I focus on writing clean, maintainable, and scalable code. My goal is not only to complete tasks, but also to help clients build stable, user-friendly, and production-ready iOS applications. If you are looking for a reliable iOS developer who can understand requirements quickly, communicate clearly, and deliver high-quality work, I would be happy to help with your project.

Hi 👋🏼, I thanks for your time checking my profile! Here is how, I can help in your iPhone/iPad app development/enhancements projects, 💻 Native iOS Development 8+ years of experience building new iOS apps or enhancing existing ones using Swift, SwiftUI, UIKit, Xcode, MVVM, TDD, Combine, etc - ensuring expected design, functionality, and performance. 🧑‍🤝‍🧑 Team Collaboration & Soft Skills Strong work ethics, communication, transparency, ownership, peer support, and idea contribution. 🎨 Pixel-Perfect UI/UX Crafting responsive and animated UI/UX based on Figma, Sketch, or other design specifications. 🛠 Scalable Architecture Using Swift patterns like VIPER, MVVM, MVVMC with clean code principles such as POP, OOP, and SOLID. 🤖 AI-Driven Development Integrating AI platforms and tools like OpenAI, ChatGPT, Cursor, etc., to speed up the development process. 🧪 Test-Driven Development Writing unit/UI tests with XCTest and automation with Fastlane. 🔌 Backend Integration Connecting with APIs built on AWS, Firebase, Node.js, Django, and other backend technology stacks. 🧳 Library/Framework integration Integration of libraries/frameworks like AVFoundation, CoreLocation, MapKit, HealthKit, PhotoKit, StoreKit, Stripe, Realm, Branch, Segment, MixPanel, Firebase, Google, AWS, Facebook, Instagram, etc. 💰 In-App Purchases Implementing IAP using Apple StoreKit, Stripe, etc. 👀 Analytics & Insights Setting up tools like Mixpanel, Segment, Firebase, etc. 📲 Release Management Delivering builds via TestFlight and App Store, with CI/CD tools like Fastlane, GitHub Actions, CircleCI, etc. Developing iPhone/iPad apps is not just my profession, rather its my passion. I believe, with innovative mobile apps, we can help people bring positive changes, growth and happiness in their life. With this inspiration and passion, I drive my day to day iOS engineering work 💪🏼 I have worked with these US and Europe based startups, where I contributed as a full time remote iOS developer and worked with a distributed product engineering team of product owners, UI/UX designers, backend developers and QAs, ⦿ TrustedShops (Germany, 3 years and 4 months) ⦿ MyInnerMe (Denmark, 1 year and 5 months) ⦿ TravelBank (USA, 1 year) ⦿ Altacucina (Italy, 5 months) ⦿ EcoHealth (USA, 3 months) ⦿ Blippar (UK, 1 year, 4 months) These have been highly successful projects and taught me about startup mindset for taking ownership of assigned work, team collaboration, real time communication, transparency, idea generation and other traits to deliver successful products while working as a team. I like to stay updated with ever evolving iOS technologies like SwiftUI, Combine, ARKit and VisionOS, constantly learning through platforms like “Kodecco” and “Hacking with Swift”. When not coding, I enjoy playing with my son, cooking and gardening 🙂

Full-stack mobile engineer with 5+ years building secure, high-performance applications, with deep specialization in VPN systems across iOS, macOS, Android, and cross-platform. Mobile iOS/macOS/watchOS Swift, SwiftUI, UIKit · MVVM + Clean Architecture · Network Extension Framework · Keychain & certificate handling Android > Kotlin, Coroutines, Flow · Jetpack Compose + XML · MVVM + Clean Architecture · VPNService implementation Flutter > Dart · Native platform channels · Shared architecture across platforms VPN & Networking WireGuard · OpenVPN · IKEv2 · V2Ray · Xray-core · Sing-box · Clash.Meta · Shadowsocks TLS, Reality, WebSocket, gRPC · Smart routing · Packet tunneling · Encrypted config delivery Backend Go · Rust (Actix + Tokio) · Ruby on Rails · REST and JWT APIs · PostgreSQL · Multi-tenant architecture · Node orchestration Featured: Aether Shield Proxy is a production iOS VPN app powered by V2Ray with TLS transport, real-time session handling, and backend-controlled node distribution. Security-first. Performance-driven. Clean code. End-to-end, from mobile client to backend infrastructure. Open to VPN systems, high-performance backends, and scalable mobile platforms.

Senior iOS Engineer | 6+ years experience | Senior iOS Developer | Claude Code skills efficient | Eastern US timezone Premium and Beautifully crafted apps for the Apple ecosystem: iOS, iPadOS, watchOS, macOS. Focusing on Swift and SwiftUI to deliver clean, scalable codebase and App Store–ready products that users actually enjoy using. I join as a strong hands-on Senior who can take ownership: • clarifying requirements, proposing the right architecture, and driving the app from idea to launch and beyond. Whether you need a Brand‑new SwiftUI app, a legacy UIKit codebase modernized, or a performance‑critical feature fixed, I make sure the result is robust, scalable, and aligned with your business goals. Technical focus areas: • Swift, SwiftUI, UIKit, Combine, async/await, MVVM, MVC, VIPER, Clean Architecture • REST API integration, JSON, authentication, push notifications, in‑app purchases, App Store deployment, TestFlight with CI/CD • Performance optimization, memory management, smooth animations, offline storage (Core Data), WebKit/WKWebView and JavaScript bridges Hardware and system integrations: • Bluetooth/BLE, watchOS, iPadOS/macOS adaptations How I work: • Product-oriented: I care about user experience, not just code quality. • Proactive Communication: clear updates, async-friendly collaboration, documented decisions. • Reliable: I respect deadlines, own problems, and stay involved through release, bug fixing, and maintenance. If you need a reliable Senior iOS Developer to lead or strengthen your mobile app, let’s talk about your product, current challenges, and what success looks like for you. Keywords: Swift, SwiftUI, UIKit, iOS Development, Clean Architecture, MVVM, MVC, VIPER, REST API Integration, JSON, Push Notifications, In-App Purchases, App Store Deployment, Performance Optimization, Memory Management, Animations, Core Data, Auto Layout, Combine, Async/Await, Git, Agile, TestFlight, Bug Fixing, App Maintenance, macOS, tvOS, Remote Work

Flutter apps usually break in the boring places: Firebase rules, API responses, payment states, push notifications, app-store builds, and the logic between screens. I work as a Flutter Developer for Android/iOS apps where the goal is not just a working preview, but a clean, testable app clients can launch. I build and improve mobile apps using Flutter, Dart, FlutterFlow, React Native, BLOC/Riverpod state management, Firebase, Supabase, REST APIs, payments, real-time chat, push notifications, and App Store / Play Store deployment workflows. My best fit is usually one of these situations: • You have a Figma design and need it converted into a real Flutter or FlutterFlow app. • Your FlutterFlow app is partially built, but the Firebase, API, payment, or app logic is stuck. • Your Flutter app needs bug fixing, performance cleanup, UI polish, or redeployment. • You need an MVP for Android/iOS, but you want the structure clean enough to grow after launch. • You want AI features such as ChatGPT/OpenAI API, AI chat, AI assistants, or automation inside a mobile app. What I can handle: • Flutter mobile app development for Android and iOS • FlutterFlow app development for MVPs, SaaS apps, marketplaces, booking apps, and dashboards • Firebase setup: Authentication, Firestore, Storage, Cloud Functions, security rules, and push notifications • Supabase setup: auth, database, APIs, and app integration • REST API and third-party integrations • Stripe, Razorpay, PayPal, in-app purchases, and subscription flows • Real-time chat, booking flows, order tracking, maps, user profiles, admin panels, and notification systems • App Store and Google Play release support Common app types I work on: eCommerce and marketplace apps, restaurant and food delivery apps, booking and service apps, dating and social apps, education apps, health and fitness apps, SaaS MVPs, and AI-powered mobile apps. Clients usually hire me when they need someone who can look beyond the screen design and make sure the app logic, backend, integrations, and launch steps are actually connected properly. If you need a Flutter Developer who can build, fix, or launch your Android/iOS app with Flutter, FlutterFlow, Firebase, APIs, and payments handled cleanly, send me the app details and I will suggest the best next step

Senior iOS Software Engineer with 15+ years in software development and 10+ years specializing in iOS. I've delivered 50+ mobile applications across enterprise environments including Royal Bank of Canada (Canada's largest bank), NETGEAR, and healthcare startups. What I bring to your project: • Native iOS expertise: Swift, SwiftUI, UIKit, Core Data, Watch SDK, Apple Pay, HealthKit • Cross-platform capability: React Native, Ionic — I've shipped on both iOS and Android • Modern architecture: VIPER, MVVM, Clean Architecture, Modular Design • App Store mastery: 50+ apps approved and launched, deep knowledge of the review process • Cloud & backend integration: Firebase, REST APIs, Amazon S3, real-time data sync Recent highlights: → NETGEAR: Designed scalable iOS architectures for smart home and networking apps (3 years) → RBC: Led modularization of Canada's largest mobile banking app serving millions of users (2 years) → Heartface: Built a video-review shopping platform MVP with video recording, playback, and e-commerce → Acuma Health: Developed a healthcare iOS app with Apple Watch integration and HealthKit → PetBooking: Re-architected an entire app from Objective-C to Swift using VIPER I'm based in Toronto, bilingual (English/Portuguese), and available for 30+ hours per week. I value clear communication, clean code, and delivering on time.