Hire the Best App Development Freelancers
in Canada

WHO I AM 7+ years of production mobile development. 5x world record holder in tech, including a Guinness World Record. 2025 Misk Global Tech Award winner. Senior Software Engineer at Microsoft on the Teams platform 300 million daily users by day. Most mobile apps fail not because of bad ideas, but bad engineering. I build iOS and Android apps that are fast, maintainable, and built to scale whether you're launching your first MVP or fixing what a previous team left behind. THE PROBLEM I SOLVE I ship products that scale. You are not hiring a coder, you are hiring someone who will take ownership, deliver on time, and leave you with code your team can actually maintain. I have built healthcare systems for hospitals, enterprise apps at Microsoft used by 300 million daily users, and production apps that handle real payment flows and real data. I know what it takes to ship software that does not break when it matters. That is the difference between a freelancer and a partner. I am the latter. SELECTED WORK ORRCA, live healthcare platform across 4 Vancouver hospitals. Manages patient records, clinical workflows, and real-time data sync with HIPAA compliance. Built with React Native and a secure Supabase backend. Kinetix, iOS and Android physiotherapy app for ACL injury rehabilitation. HealthKit integration, video-guided exercises, offline functionality, and progress tracking. Built with Flutter. PawMatch, pet services marketplace connecting sitters with pet owners. Swipe-based matching, real-time messaging, Stripe payment processing. Flutter and marketplace architecture at scale. Beauty Appointment App, progressive web app for beauty appointment booking. Cross-platform mobile and web, optimized for conversion. FlutterFlow with real-time backend sync. Microsoft Teams, enterprise mobile app, 300 million daily users. WHAT I BUILD React Native and Flutter apps for iOS and Android Cross-platform mobile app development and MVP delivery Gamification systems — XP engines, streaks, quests, leaderboards BLE hardware and IoT device integrations Stripe Connect with marketplace payments, subscriptions and split payouts Supabase and Firebase backends with row-level security AI and ChatGPT feature integrations HealthKit and Health Connect integrations Full App Store and Google Play submission and compliance Admin dashboards and web applications Node.js backend and REST API development TECH STACK Mobile: React Native, Flutter, Expo, iOS, Android Backend: Supabase, Firebase, Node.js, REST API, AWS Payments: Stripe Connect, in-app purchases, subscriptions AI: OpenAI, ChatGPT integration, AI-powered mobile apps Health: HealthKit, Health Connect, BLE devices INDUSTRIES I HAVE BUILT FOR Healthcare and medical platforms Enterprise software and SaaS Consumer health and wearables Fintech and payments Marketplace and two-sided platforms Community and social platforms Fitness and wellness apps Education and e-learning WHY I AM DIFFERENT Ownership Mentality. I do not just write code, I care about your success. Your problem becomes my problem. I will not ship something unless I would be comfortable using it myself. Clarity and Predictability. NDA before sensitive discussion. Scope and milestones locked before any code. Weekly check-ins. GitHub and Supabase access on Day 1. You own everything from the start. No surprises. Selective Not Desperate. I turn down projects that are not the right fit. This means you get my full focus, not a divided contractor juggling 20 clients. Enterprise Standards at Freelance Speed. Microsoft-quality code. Clean architecture. Security baked in. Performance optimized from Day 1. WHO I WORK BEST WITH Funded startups, growing companies, and enterprises who need a senior mobile app developer, not a code monkey. If you have a spec, a timeline, and a real budget, we will work well together. HOW WE WORK TOGETHER Step 1. Message me with your scope. I will respond within 24 hours and tell you if I am the right fit. Step 2. Alignment call. We discuss your product, timeline, and expectations. No surprises. Step 3. Scope locked. Milestones, deliverables, and timeline in writing before any code. Step 4. Day 1 ownership. GitHub, Supabase, and all credentials transferred to you. You own the code from the start. Step 5. Weekly check-ins. Video sync to keep you updated. No ghosting, no excuses. If your project is serious, message me with your scope. I will tell you within 24 hours if I am the right fit. If I say yes, you have my full commitment. Best Rayyan Siddiqui

I build production software for Apple platforms (iOS, tvOS, and watchOS) and Roku. My focus is video streaming, playback, and ad insertion, on a broad foundation of Apple-platform engineering. Across an 18-year software career, 15+ of it on Apple platforms, I've shipped for Bell Crave, Warner Media, ViacomCBS, IBM, and Quber. A few examples of my work: - Delivered Roku development on the Bell Crave streaming platform in BrightScript and SceneGraph, tuning load times and navigation across device tiers. - Tech-led the video player component across the ViacomCBS suite (MTV, Comedy Central, Nickelodeon, Noggin) on iOS and tvOS, and refactored ~35% of the shared codebase so each brand could extend it without breaking the others. - Built a lightweight HLS interstitial replacement for discontinuity ads via AVAssetResourceLoaderDelegate, parsing HLS manifests on the fly, opening a path to dropping a third-party ad SDK entirely. - Improved a watchOS app's battery life by 400%+ through a standalone design, HealthKit and location optimization, and removing memory leaks. - Integrated CSAI and SSAI ad insertion and analytics across client apps; added SharePlay and unit-test coverage. Streaming and ad insertion are where I go deepest, but they're a specialty, not a fence. I take on a range of Apple-platform contract work: app architecture, performance, complex UI, StoreKit, and more. Earlier on, I built the original Quber fintech app from scratch (users saved over $2M during beta) and worked for years as a 5-star iOS freelancer here on Upwork, with 22+ jobs and several multi-year clients. How I work: practical and honest. I'll tell you when something can't be done, or when a simpler approach saves you time and money. I'd rather scope a project realistically than oversell it. Available now for contract work.

Are you building a product that needs to scale to 1M+ users? With 9+ years of experience across 30+ international startups, I have architected and deployed over 50+ full-stack applications including a flagship app that achieved 1M+ downloads on the App Store. As a Top-Rated freelancer with a 100% Job Success Score, I specialize in "Whole Product" engineering. I bridge the gap between high-performance mobile interfaces and robust, scalable backends, eliminating the friction of managing separate frontend and backend teams. * What this means for you: Rapid prototyping, automated unit testing, and faster feature deployment without sacrificing code quality. * The Result: You get Enterprise-Grade architecture at Startup speeds. I have expertise on complex logic, security, and UX, while automating the boilerplate. Proven Track Record: * Healthcare & Biometrics: Developed complex BLE (Bluetooth Low Energy) integration for real-time health monitoring with 99% connection reliability. * High-Load Scaling: Optimized APIs for PrioritySoft, reducing response time from 4s to <200ms and cutting infra costs by 40% while handling millions of requests. * Market Success: Built and scaled "SipSkip" from MVP to multi-city production usage.
 Technical Arsenal: * Mobile (Hybrid & Native): Flutter (Expert), Kotlin, Swift, React Native. Pixel-perfect UI, complex animations, and state management (BLoC, Riverpod). * Backend & Cloud: Python (Django/FastAPI), Node.js, AWS (EC2, S3, RDS, Lambda), Docker, CI/CD pipelines. * Database: PostgreSQL, MongoDB, optimized for high-concurrency. I treat every project as if I am the CTO. This means clear communication, realistic milestones, and code that is clean, documented, and ready for your future team to inherit. Ready to turn your vision into a scalable reality? Let's discuss your roadmap.

Android Developer | 8+ Years | 1M+ Users Worldwide With 8+ years of Android development experience, I’ve designed, built, and optimized apps trusted by over 1M users globally—including high-impact projects like Getaround and HyreCar. I specialize in writing clean, maintainable code and delivering scalable, high-performance applications with seamless user experiences. As a Top-Rated Plus Freelancer on Upwork, I’ve earned $20,000+ with a 100% Job Success Score, a testament to my reliability, quality, and client satisfaction. Whether you need a new app from scratch or want to enhance an existing one, I ensure performance, scalability, and user delight. 🛠️ Core Skills Languages & Architecture: Kotlin, Java, MVVM, Clean Architecture UI/UX & Interaction: Jetpack Compose, Navigation, Motion Layout, Material Design, Custom Views, Accessibility APIs & Communication: REST, GraphQL, Retrofit, Coroutines, RxJava, Socket.IO Firebase & Cloud: FCM, Analytics, Crashlytics, Remote Config App Publishing & Payments: Google Play Console, In-app Purchases, Stripe, Payment Gateways DevOps & Tooling: Git, CI/CD (GitLab), Docker, Fastlane Advanced Features: Hilt/Dagger, Location Services, Multi-language Support, Offline Handling, Performance Optimization, PDF/Excel Generation 🌍 Industry Experience 🚗 Car Sharing & Rentals: Getaround (1M+ users), HyreCar (500K+ users) 🩺 Healthcare & Wellness: Medicine Reminder, Alzheimer’s Detection, BMI Calculators 🛍️ E-commerce & Marketplaces: Sozer Jewelry, Weat Local Marketplace 🎙️ Media & Streaming: Silvers Radio, Streaming Radio Apps 🏋️ Fitness & Lifestyle: Custom Workouts, Freight Booking (FreightPrint) 🚀 Key Achievements ✔ Integrated advanced SDKs: Stripe (Payments), Mitek (ID Verification), Sendbird (Messaging), Instabug (Bug Reporting) ✔ Automated builds & releases with CI/CD pipelines in GitLab + Firebase distribution 💡 Why Work With Me? 🔹 Strong problem-solving skills – quick and efficient issue resolution 🔹 Proactive communication – clear updates, no guesswork 🔹 Clean code advocate – maintainability & scalability first 🔹 User-first mindset – intuitive, engaging, and accessible apps 🔹 Continuous learner – always up to date with the latest Android trends 📩 Let’s build your next Android app—scalable, performant, and user-friendly.

With over 15 years of experience in web and mobile application design and development, I am a seasoned Web Designer & Developer holding a Master's degree in Computer Science. My journey is marked by a 100% job completion rate and the prestigious "Top Rated Freelancer Plus" badge on Upwork, with over 14,000 logged hours and 300+ projects completed. I specialize in end-to-end development, from the initial concept to final testing and deployment. Whether you need a captivating landing page, a robust e-commerce store, or a fully customized web app, I bring extensive expertise in UI/UX design, front-end & back-end development, and CMS integration to deliver exceptional results. What I Can Do for You: Custom Website Design & Development: Crafting pixel-perfect, fast, and mobile-friendly sites. UI/UX Design: Creating modern, intuitive, responsive, and conversion-optimized interfaces. E-commerce Solutions: Expertise in Shopify, WooCommerce, Magento, and custom solutions. CMS Development: Proficient in WordPress, Webflow, and custom-built CMS platforms. Full-Stack Development: Skilled in React, Vue, Laravel, Node.js, and more. API Integrations: Seamless integration of payment gateways, third-party services, and automation tools. SEO & Performance Optimization: Enhancing site speed, security, and search engine visibility with full SEO compliance. Lead Conversion: Delivering a flawless user experience with compelling CTAs to maximize engagement and drive conversions. Payment Integration: Incorporating features like real-time chat, downloadable resources with lead capture, and Stripe payment integration. Premium Features Implementation: Integrating brand logos, video testimonials, Google reviews, dynamic blog pages, interactive forms, and a powerful lead-generation system with Mailchimp CRM. My approach is collaborative, aligning design and content with your vision while executing precise and detailed instructions to deliver a polished, professional website. Why Work With Me? Experienced & Reliable: A proven track record of building scalable, high-performing websites. User-Centered Approach: Focused on usability, engagement, and conversions. End-to-End Support: From concept to launch and ongoing maintenance. Deadline-Oriented: Respecting your time and always delivering on schedule. Key Skills: Enterprise-Level Experience: Collaborating with both start-ups and top-rated organizations to bring visions to reality. Timely Delivery: Ensuring projects are completed within the stipulated time frame. Project Discussion: Conducting preliminary meetings to understand projects in depth before development. Thorough Testing: Rigorous testing to ensure all tasks are completed without issues. Flexible Budget Considerations: Offering budget-friendly solutions tailored to client needs. When you're seeking a web and mobile app developer, I'm your go-to professional. I offer competitive pricing and a hassle-free process, keeping clients updated throughout and providing complete control over the project. Client Feedback: "Very reliable and responsive. The work completed was exactly what I was hoping for. Willing to go the extra mile to make sure everything is right. Timely and realistic about schedules and budgets. Highly recommended." “Shaoli was wonderful to work with. Her communication skills are fantastic and she has great ideas. I look forward to working with her again in the future!”

Hello! I'm Pavlo, an individual Android (Kotlin, Java) and iOS (Swift) developer with 13 and 8 years of commercial experience, respectively. I also have a few months of commercial experience in cross-platform development using Flutter. If you are looking for such a specialist, please take a couple of minutes to check out my profile. 🟢 MY SERVICES 🟢 The services I provide cover a broad spectrum of capabilities, which include, but are not limited to: - Developing mobile applications for iOS and Android, including iPhone, iPad, Android phones and tablets, TV and wearable devices. - Providing ongoing support, maintenance, and updates for existing apps. - Porting apps from different platforms to iOS and Android. - Recreating cross-platform and hybrid apps using native technologies. - Performing code migrations and updates, including SDK version, package builder, legacy libraries, and other tools. - Transforming app designs from Figma into functional applications. - Incorporating in-app purchases and advertisements into the apps. - Submitting the apps to the App Store and Google Play, resolving any review-related concerns. - Conducting prototyping and UI/UX design. - Creating comprehensive technical documentation and API specifications. 🟢 MY WORKING EXPERIENCE 🟢 My commercial experience as a mobile developer began in 2013 when I secured a job as an Android Java developer. Since 2015, I have been working exclusively as a freelancer. In 2016, I started learning Swift programming language and embarked on my career as an iOS developer. In 2018, I made a complete transition from Java to Kotlin for new Android projects. Recognizing the market's need for cost-effective solutions, in 2023, I started working as a Flutter developer. Throughout my journey, I have seamlessly acquired expertise in UI/UX design by closely adhering to the platform guidelines of both iOS (Human Interface Guidelines) and Android (Material Design). As an active user of both platforms, I constantly stay updated with the latest trends in products and technologies, ensuring I never miss out on key events like Apple WWDC and Google I/O conferences. Building upon my previous commercial experience as a QA engineer from 2012 to 2013, I combine meticulous attention to detail with strong perfectionistic tendencies, enabling me to consistently deliver exceptionally high-quality and reliable mobile applications. 🟢 MY SKILLS 🟢 Here are some of the cutting-edge technologies I utilize in my work. Native Android: - Android SDK, Gradle, Kotlin, Kotlin Coroutines, MVVM Architecture, Jetpack, Jetpack Compose, Retrofit, Apollo GraphQL, Hilt, Room for SQLite, and JUnit. Native iOS: - iOS SDK, Swift, Swift Package Manager, MVVM Architecture, SwiftUI, Combine, Concurrency, Alamofire, Apollo GraphQL, Swinject, CoreData, and XCTest. Flutter: - Flutter SDK, Dart, MVVM Architecture, Concurrency, dio, sqflite. I possess extensive experience working with numerous other technologies, frameworks, and libraries such as: Java, RxJava, XML UI, CocoaPods, UIKit, RxSwift, MVC & MVP Architecture, Dagger, Koin, Realm, Glide, Coil, Picasso, Kingfisher, SDWebImage, Google Maps & Geocoding, MapKit, HealthKit, Mapbox, Facebook SDK, Twitter SDK, Zoom SDK, GitHub SDK, Google Pay, Apple Pay, Stripe, Braintree, AdMob, Bluetooth, Bluetooth Low Energy (BLE), NFC, Camera API, Firebase SDK (Analytics, Crashlytics, Auth, Database, Firestore, Machine Learning, Storage, Hosting, Cloud Functions, and more).