Hire the Best MacOS App Developers
in Portugal

🔸 Swift, JavaScript, Objective-C 🔸 SwiftUI, UIKit, AppKit, Catalyst 🔸 Combine, MVVM, MVC 🔸 CoreData, Firebase, Amazon S3 🔸 Multithreading, Memory Management 🔸 UX 🔸 Server-side Swift, Vapor, Swift-NIO, Backend development

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.

I’m a senior software developer from Portugal with more than 20 years of experience building commercial desktop and mobile applications. I help teams build, stabilize, refactor, and extend products that involve real technical complexity. My work is focused on desktop and mobile software where senior technical judgment matters: Qt/C++ applications, native iOS and Android apps, performance-sensitive features, media and audio/video pipelines, computer vision, hardware integration, OS-level behavior, and long-term maintainability. I have worked on commercial products used by real customers, including projects such as Rocketbook - Document Scanning, Triller - Music Video Social Network, ROVR Radio - Audio Production & Dashboard, Toby - AI Real-Time Audio Translation, iContact - Camera Widget, VideoShop - Video Composition, iGreet - Augmented Reality Greeting Cards, LeanStreamer - Multiple Audio Encoding Streaming Tool, BigRoom - Automated AI Editor, and other desktop and mobile applications that required reliable implementation and careful technical decision-making. Clients usually hire me when they need help with: • building a desktop or mobile product properly from the ground up • refactoring an existing codebase without unnecessary rewrite risk • solving platform-specific issues that are blocking progress or release • implementing complex native features involving camera, audio, video, files, hardware, or OS APIs • improving architecture, maintainability, performance, and stability • adding senior technical depth to an existing team or codebase My core expertise includes Qt/C++, desktop software, native iOS and Android development, software architecture, refactoring, performance optimization, media processing, computer vision, and hardware or platform-level integration. I’m especially well suited for products that already exist and now need to be improved carefully. That may mean stabilizing a codebase, modernizing architecture, solving difficult technical issues, or extending the product in a way that remains clean and maintainable. I care about building the right foundation early, keeping the codebase understandable, and making technical decisions that still make sense in the long run. If your product already exists and needs senior technical help to move forward safely, I’d be glad to discuss it.

🎖️ 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.

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