Hire the Best iOS Developers
in Portugal

I've been working as an iOS Developer for 14 years. Experienced in both Swift and Objective-C, I have developed apps for the iPhone, iPad, Apple Watch and Apple TV. I've worked on Android too, both Java and Kotlin. I have submitted many apps to the App Store, with complex interfaces, extensive web service communication, and multimedia content. Some of these apps got good references in the press, and one of them, Back in Time, was selected by The New York Times as one of the Top 10 iPad apps of the year.

Worked on 𝗵𝗶𝗴𝗵-𝘁𝗿𝗮𝗳𝗳𝗶𝗰 𝗶𝗢𝗦 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝘀 serving 𝗺𝗶𝗹𝗹𝗶𝗼𝗻𝘀 𝗼𝗳 𝘂𝘀𝗲𝗿𝘀, contributing to 𝘀𝘁𝗿𝗲𝗮𝗺𝗶𝗻𝗴 𝗽𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀 𝘀𝘂𝗰𝗵 𝗮𝘀 𝗣𝗲𝗮𝗰𝗼𝗰𝗸, 𝗦𝗵𝗼𝘄𝗺𝗮𝘅, 𝗮𝗻𝗱 𝗦𝗵𝗼𝘄𝘁𝗶𝗺𝗲, and to 𝐀𝐈 𝐊𝐮𝐬𝐭𝐨𝐦𝐞𝐫 𝐬𝐞𝐫𝐯𝐢𝐜𝐞 𝐩𝐥𝐚𝐭𝐟𝐨𝐫𝐦 & 𝐂𝐑𝐌 (𝐖𝐨𝐫𝐤𝐞𝐝 𝐨𝐧 𝐭𝐡𝐞𝐢𝐫 𝐢𝐎𝐒 𝐒𝐃𝐊) which is now acquired by Meta. Senior iOS Developer with 8+ years of experience building and scaling production mobile applications. I help startups, businesses, and founders like you launch high-quality iOS apps using Swift, SwiftUI, AI integrations, HealthKit, subscriptions, and scalable architectures. 𝗜 𝗰𝗮𝗻 𝗵𝗲𝗹𝗽 𝘆𝗼𝘂 𝘄𝗶𝘁𝗵: ✅ AI-powered mobile apps (OpenAI, Anthropic, chat, voice, recommendations) ✅ Health & fitness apps (HealthKit, wearables, HIPAA-conscious workflows) ✅ Video streaming & real-time communication (Agora, WebRTC, VoIP, PushKit, CallKit) ✅ Subscription apps (StoreKit, RevenueCat, App Store optimization) ✅ Firebase & Supabase integrations ✅ Apple Watch companion apps ✅ Performance optimization and scalability ✅ Existing codebase ownership, refactoring, and technical debt reduction ✅ App Store deployment, TestFlight, and release management 𝗖𝗼𝗿𝗲 𝘁𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀: Swift • SwiftUI • UIKit • Objective-C • Combine • RxSwift • Firebase • Supabase • PostgreSQL • HealthKit • CoreBluetooth • StoreKit • RevenueCat • OpenAI API • Anthropic API • Twilio • Agora • WebRTC • AVFoundation • Push Notifications • GitHub Actions • Fastlane 𝗖𝗼𝗿𝗲 𝘀𝗲𝗿𝘃𝗶𝗰𝗲𝘀: Senior iOS Developer | Swift Developer | SwiftUI Developer | iPhone App Development | iPad App Development | Apple Watch App Development | AI App Development | Healthcare App Development | HealthKit Integration | Video Streaming Apps | VoIP & Calling Apps | Subscription App Development | MVP Development | Existing Codebase Support | App Modernization | App Maintenance | Feature Development | Bug Fixing | Performance Optimization | Architecture Refactoring | Technical Debt Reduction | Code Review | API Integration | Firebase Integration | Supabase Integration | Real-Time Chat | Push Notification Integration | App Store Deployment | TestFlight Management | Legacy Objective-C Migration | Startup MVP Consultant Whether you're building an MVP, scaling an existing product, or preparing for launch, I focus on delivering maintainable code, excellent user experiences, and long-term product success. Let's discuss your idea and turn it into a production-ready app.

Senior mobile app engineer with $20K+ earned, 1,600+ hours, 20 Upwork jobs, and a 100% Job Success Score. I build production-ready iOS, Android, and Flutter apps, and connect them to modern web back ends and AI-powered features. I can take a mobile product from idea to release: product planning, mobile UI/UX, architecture, development, API and Firebase integration, testing, deployment, and long-term maintenance. What I can help you with: • Native iOS development with Swift • Android and cross-platform Flutter development • AI integration for smarter mobile experiences • Full-stack web, API, and Firebase integration • Mobile UI/UX design and interactive prototypes • Existing-app rescue, bug fixing, and performance improvements • Push notifications, real-time chat/video, media, and e-commerce features • iPhone and iPad feature development, including App Clips My Upwork history includes health, task-management, news, fashion, e-commerce, and communication apps. Clients consistently highlight my code quality, reliability, proactive communication, and on-time delivery. I hold a Master’s degree in Mobile Computing and a Bachelor of Engineering in Computer Engineering. I communicate fluently in English and natively in Arabic. Whether you need a new app, a senior engineer to strengthen an existing product, or one partner across mobile, web, AI, and UI/UX, send me your scope and current challenges. I’ll respond with a practical technical plan and clear next steps.

Greetings, With over 15 years steeped in the world of software development, I’ve dedicated a significant portion of my professional journey to crafting high-quality iOS applications. The path from conceptualizing an idea to witnessing its tangible transformation on an iPhone or iPad is one I've walked many times. As the director of a software testing studio, I bring not only development expertise to the table but also a rigorous standard for software quality and performance. Every application tells a story, and my team and I are committed to ensuring that story is told seamlessly. If you're seeking a seasoned perspective and a reliable hand in bringing your iOS vision to fruition, I invite you to connect. Let's embark on this journey together. Warm regards. Kiryl

🎖️ Top Rated Plus on Upwork (Top 3%) ✔️ 100% Job Success – Proven track record of client satisfaction ✔️ 20+ Successful Projects completed ✔️ 1,000+ Hours worked and still counting I’m an experienced Software Engineer with over 8 years of expertise, specializing in Apple platforms for the past 5 years, with a focus on iOS development. My tech stack enables me to deliver innovative, high-performing, scalable apps. With 3 years of graphic design experience, I ensure pixel-perfect execution, and my 5 years in management helps me lead teams and optimize workflows. I’ve consistently exceeded client expectations across various industries with outstanding performance and engagement. Tech Stack & Approach: 👾 iOS Development: Expert in Swift and SwiftUI for building native iOS applications optimized for the latest iOS updates. Proficient in modern design patterns such as MVVM, VIPER, TCA, and Clean Architecture, ensuring scalable, maintainable, and high-performance apps with clean code and a solid structure. 👾 watchOS, tvOS, macOS, iPadOS, visionOS: Skilled in developing for Apple’s broader ecosystem, creating seamless apps for watchOS, tvOS, macOS, iPadOS, and the latest visionOS. Focused on delivering apps that fully leverage the unique capabilities of each platform for an optimized user experience. Tools & Technologies: 🥷🏻 iOS Tech Stack: Swift, SwiftUI, UIKit, CoreData, Combine, AVFoundation, CoreLocation, MapKit, HealthKit, Animations, Bluetooth, NFC, CallKit, StoreKit, PushKit, Push Notifications 🥌 Design Tools: Figma, Adobe Creative Suite (for UI/UX collaboration) 📎 Backend: RESTful APIs, Firebase, GraphQL 📎 CI/CD: Fastlane, Jenkins, Git, GitHub 📎 Project Management: JIRA, Trello, Slack, Monday 📎 Testing & Automation: XCTest, Snapshot Testing I’m proficient in Agile/Scrum methodologies with a deep understanding of the full app development lifecycle—from concept to deployment and continuous improvement. I excel in troubleshooting, team management, and mentoring developers, fostering faster, more efficient workflows. My goal is to deliver high-quality products and solve complex technical challenges to drive business growth. 💬 Invite me for a free 30-minute consultation to discuss how I can help your project succeed.

I build high performing Mobile Apps for ambitious brands. If you need a reliable Mobile App Developer or Flutter Developer, I deliver results as a dedicated Cross-Platform Developer, iOS Developer, and Android Developer. Buggy interfaces, crashing screens, and messy State Management are killing your user retention and eating into your profit margins. Let me fix that. I specialize in iOS & Android Development that scales, using a rigorous, manual coding approach to ensure rock-solid Mobile Architecture. I do not rely on brittle, auto-generated AI shortcuts; I build the foundational infrastructure from scratch so your product actually works and scales without breaking. Whether you need immediate Technical Debt Rescue for a stalled app, intensive Legacy Code Refactoring, or rapid MVP Development engineered correctly from day one, I deliver Custom Mobile Solutions focused on flawless user experiences and App Performance Optimization. Here is how I drive real business results through clear, high-quality app development: Bringing your new app idea to life: Starting entirely from scratch? I take your vision and build a rock-solid app from day one. Instead of rushing a messy prototype, I write clean, custom code from the ground up so you launch a polished product that actually works saving you from expensive rewrites down the road. Making it easy for users to pay you: I build smooth, simple checkout screens and subscription setups. If your payment process is frustrating, people will leave without buying. I fix those roadblocks so your app generates reliable revenue and you stop losing sales at the finish line. Fixing broken apps to save your ratings: Have an app that crashes, lags, or freezes constantly? Users will delete it and leave bad reviews. I step in to rescue messy code and clean it up from the inside out. The result is a stable, crash-free app that keeps your users happy and protects your brand's reputation. Building fast apps that grow with you: Nobody likes a slow app. I write solid infrastructure by hand without relying on lazy AI shortcuts so your product stays lightning-fast. Whether you have a hundred users or a hundred thousand, your app will feel smooth, responsive, and ready for growth. Stop losing users to slow load times and broken features. Message me with your biggest current app bottleneck or your Figma design link, and I will give you a free, straightforward technical assessment on exactly what it will take to fix it or launch it. Keywords: Senior Mobile Developer, Flutter Architect, Dart FFI, iOS Swift, Windows Desktop, macOS Native, Clean Architecture, BLoC Pattern, Supabase, CI/CD, App Performance, Technical Debt Rescue.Mobile App Developer, Flutter Developer, iOS and Android App Development, Cross-Platform Developer, Mobile Apps, Mobile Architecture. Senior Mobile Developer, MVP Development, App Performance Optimization, Firebase Integration, Supabase Expert, CI/CD Pipelines, GitHub Actions, Legacy Code Refactoring,Flutter Architect, Clean Architecture, BLoC Pattern, State Management, Dart FFI, C++ Integration, Desktop App Development, Technical Debt Rescue.