I build complete iOS apps and take on projects that arrive with a hard deadline or a problem that has been open for a while. 15 years in Swift, SwiftUI, UIKit and Objective-C, 70 contracts and 7,600 hours delivered here. Two situations cover most of my work. In one, a client needs a single engineer to own iOS entirely: architecture, UI, integrations, App Store release, and everything after it. In the other, there is an existing codebase, something in it is wrong, and someone has to get productive in it quickly. I do both. After 70 projects I have seen most of the ways an iOS app can be assembled. Performance is where I spend the most attention. Fast launch, content on screen immediately, smooth scrolling, flat memory, and a device that stays cool through a long session. Crash-free rate is a number I watch release over release and treat as part of what I deliver. TECHNICAL Swift, SwiftUI, UIKit, Objective-C, Combine, async/await, MVVM and modular architecture Networking and real time: REST, GraphQL, WebSockets, Firebase, push and VoIP notifications Payments: Stripe, Apple Pay, StoreKit in-app purchases and subscriptions with server-side validation AI and ML: OpenAI and LLM integrations, Core ML, Vision, on-device inference Media: AVFoundation, camera and video pipelines, background audio, streaming SDKs Data and graphics: Core Data, SwiftData, Metal, MapKit and location services Delivery: XCTest, Instruments, Xcode Cloud, GitHub Actions, TestFlight, App Store review Backend: Node.js, TypeScript, PostgreSQL, Redis, AWS. I design and ship the server side of my own products, so on a small team you get one engineer accountable for the full stack. INDUSTRIES Social and dating platforms. Fintech and payments. AI-powered products. Live commerce and marketplaces. Media and streaming. Location-based services. An SDK running inside an app with over 10 million downloads. HOW I WORK I ask the awkward questions in the first conversation, while changing the answer is still cheap. You get a written scope and a number before any code exists. Builds go to TestFlight regularly, so the app stays in your hands for the whole project. I write code for the person who opens the file a year from now. My hours overlap the US working day and I reply within a few hours. If you have an iOS project, especially one that is technically demanding or already in trouble, send me the details. I will tell you honestly whether I am the right fit, what it will take, and how long.

Founder, full-stack & AI engineer with 12 apps live on the App Store, 4,000+ users, and a Top Rated profile with 100% Job Success. I'm not just a developer for hire. I build, ship, and operate my own AI-powered products end to end, and I bring that same founder-level ownership to every client project. From fintech platforms with real bank connections to AI-powered wellness, health, and productivity apps, I design the user experience, engineer the backend, integrate the AI, implement monetization, and take products all the way to launch, App Store or web. What I bring to your project: ⌁ AI Engineering Production AI, not demos: multi-model systems across OpenAI, Claude, and Gemini with cost-tiered model routing, agent pipelines, and vision, voice, and reasoning features grounded in real user data, engineered for reliability, latency, and cost. ⌁ Full-Stack Development I build the entire system, includth FastAPI and PostgreSQL, as well as Firebase and Supabase for authreal-time synchronization, and server-side logic, plus Next.js hboards. ⌁ iOS & Apple Ecosystem Modern, modular Swift & SwiftUI (rk, Swift Concurrency) withpixel-perfect, first-party-qualiteMotion and AirPods sensor data,FamilyControls and Screen Time APs, Apple Watch, and macOS. ⌁ Fintech & Monetization Experience with Plaid integration2 subscriptions, and RevenueCat paywalls, with secure token manag ⌁ Security-First Engineering Hardened authentication flows, sege, and a clean App Store submission history with zero secuing I've shipped. Clients consistently highlight th • Translate complex product ideasiences. • Deliver quickly without sacrifi • Communicate clearly, set realis ownership of delivery. I approach every engagement as a task executor because I thinkabout your users, conversions, anof care I bring to my ownproducts.

I build native iOS apps that put machine learning on the device - not in the cloud. Before iOS, I spent a decade as a quantitative risk analyst for banks including Barclays and Absa, building credit-risk and Basel II models in SAS and C++. I hold a PhD in Computer Science (AI), specialising in heuristic search. That background is why clients bring me the AI/ML problems other iOS developers can't touch I don't just implement a model; I know whether it's the right model to begin with. - Clients have been impressed by my professional approach, ability to complete tasks ahead of schedule, and deep knowledge of iOS development. - Exceptional problem-solving skills, innovation, self-management and excellent communication abilities. - An active contributor to GitHub. Some of my key success areas are: - Converting Python/PyTorch machine learning models into Core ML and getting them running efficiently on-device - no live connection or ongoing API costs. - Integrating AI and machine-learning models into iOS apps more broadly. - Updating or fixing older, defunct apps written in Objective-C or Swift. - Using and integrating with backend services such as REST APIs. Core skills (not an exhaustive list) - Worked with HealthKit, CoreBluetooth, CoreGraphics, UIKit, SwiftUI, CoreLocation, In-App Purchases, CoreData, and many other iOS frameworks. - Built geospatial apps, maps, R-Tree algorithms, and large-scale geo-data solutions on iOS.
 - Skilled with UI/UX animation tools such as PaintCode, and with embedding assets in CoreGraphics efficiently. - Experienced with AI technologies such as MyScript (handwriting recognition) and staying familiar with newer platforms such as OpenAI, Anthropic, etc. - Proficient in using architectural patterns such as Model-View-ViewModel + Coordinator (MVVM-C), applying them in UIKit and MapKit for geospatial apps, and binding data and presentation with RxSwift and Combine. - Skilled in creating Swift Packages and incorporating code from C/C++, Objective-C, and Swift — giving other developers a clean way to use mathematical or statistical libraries without deprecated-code or linkage issues, while preserving unit tests for macOS builds. - Proficient in Python 3 for preparing, analysing, or transforming data for AI/ML models before migrating a pre-existing model to the macOS/iOS AI/ML toolchain (Core ML, Vision, Speech, etc.) via .mlmodel, .mlpackage, etc, files. The AI Co-worker's policy - Always adhere to the client's AI policies when using agentic-AI workflows within my development process. - Prioritize local LLMs as the first choice to preserve data privacy and keep intellectual property inside the development environment. - Cloud AI (ChatGPT, Claude) is used only as a last resort and only with the client's permission. - Running local LLM models provides flexibility in selecting the most appropriate model (e.g., Qwen-3 Coder, Llama, IBM Granite) for tasks such as debugging code, generating boilerplate, or performing code reviews. You, the client(s) - High client-retention rate (80%+); clients keep coming back! - Experience on $50k-plus projects, though I also enjoy smaller, intellectually stimulating assignments. - More than just "fingers and hands that punch code." - I plan my schedule in alignment with your needs. Courses and licences by IBM - Deep Learning and Reinforcement Learning — Certificate S7Z8ZA6VPDJD - Unsupervised Machine Learning — Certificate W0JPSC2N0S36 - Supervised Machine Learning: Classification — Certificate BCYGSJNSWTWY - Supervised Machine Learning: Regression — Certificate H8WXTNBHTAVZ - Exploratory Data Analysis for Machine Learning — Certificate 2RH34AOEWB14 All verifiable in the Licenses section. Selected client feedback - "…works well independently, brings new insights and polished solutions, responsive and clear with top-quality work. Have already hired again!" - "We knew we would need a highly organized and innovative developer who could self-manage the development process, and Theo delivered." - "Excellent work – understood the task well, provided good feedback, completed work within schedule." - "Provided a very straightforward and well-thought-out plan." - "Theo would be the best choice." Recent work: - An on-device ML classifier built on Apple Health data, a cross-platform iMessage sticker app, and performance work on a high-traffic chat app. - If your model was trained in PyTorch or TensorFlow and you're not sure it'll convert cleanly to Core ML — that's exactly the kind of problem I catch early, before it turns into a rebuild. I've delivered $50k+ projects but genuinely enjoy smaller, interesting ones too. Want to talk it through first? Book a 30-minute consultation for $50. If you're interested or need more information, let me know.
 Theo

Senior full‑stack iOS engineer (Swift/SwiftUI/UIKit) who can ship the mobile app + the backend end‑to‑end (Node.js + TypeScript). If you have an existing app that needs to scale, stabilize, or move faster, I can step in, quickly get context, and start delivering. What I do best • iOS/iPadOS/macOS development in Swift (SwiftUI + UIKit) • API design + implementation (Node.js/TypeScript), Firebase, REST/GraphQL integrations • Architecture & codebase health: MVVM, DI, modularization, testing • Performance & reliability: profiling, crash fixes, memory leaks, smooth UI • Legacy modernization: UIKit → SwiftUI, Objective‑C → Swift Typical engagements 1) Audit (3–5 days, fixed price): quick assessment + prioritized plan + first fixes 2) Stabilization/feature sprint (1–2 weeks, fixed): ship milestones, unblock releases 3) Ongoing retainer (monthly): predictable delivery cadence + support Recent outcomes ✓ Built apps with 100k+ monthly active users ✓ Helped startups gain early adopters via MVP + TestFlight ✓ Modernized legacy codebases and improved performance/stability If you share your repo/API constraints and your top 1–2 goals for the next 2 weeks, I’ll propose a tight plan with milestones.

🫡 Extremely Reliable, Communicative and Fast 🥇 The Top 1% of Talent (Expert Vetted) 💰 60+ apps shipped, generating over 8 figures in revenue. ⚡ AI speed combined with 8 years of production experience to deliver code that ships fast, feels premium, and scales without cracking. (Available for 2 projects in April 2026) 🛠️ Specializing in Mobile App Development | Flutter, Swift, or React | iOS and Android 🇺🇸 Honored as a Top Mobile App Developer for hire in the United States from 2020-2025. 🏆 Award Winning Mobile App Developer: previous app featured on Apple's List of Best Language Learning Apps. 📰 Featured on Business Insider for my innovative contributions to mobile app development on Upwork. I've had the privilege of propelling clients to significant milestones, including achieving $2M in Annual Recurring Revenue (ARR). Some notable successes include: - A restaurant subscription app reaching $100K+ Monthly Recurring Revenue (MRR) - A fitness community app achieving $1.5M+ ARR. ⭐️ Client Testimonials: "Michael is a gem in the world of mobile app development..." "Among the top 3 developers I've worked with over the past three years..." "A quality developer and a quality human being..." Upwork Stats: 🏅 Top 1% of Mobile Developers 🏅 Top 1% of iOS Developers 🏅 Top 5% of Firebase Developers 🏅 Top 5% of Swift Developers 🎓 Proud Michigan State University Graduate with a Bachelor's Degree in Computer Science. With a solid eight-year trajectory as a Mobile App Developer, I've honed my skills across a plethora of projects that span iOS and Android platforms, utilizing Flutter and Swift to create high-impact applications. My forte lies in converting ideas into digital realities that propel businesses forward. From crafting engaging user interfaces to optimizing backend processes, my holistic approach ensures a robust and scalable app solution. I thrive in various development scenarios, whether its working with a team to deliver a project on a tight deadline or building an application from scratch all on my own. My experience extends to working with startups that have secured significant venture capital funding, as well as established enterprises aiming to expand their digital footprint. 🌟 Why Choose Me: Client Satisfaction: My reviews reflect the genuine value I provide. Effective Communication: I prioritize prompt and sincere interactions to ensure project fluidity. Mastery: I strive for flawless, visually appealing apps worthy of portfolio inclusion. 😁 Excited to collaborate! Whether you're a startup aiming to elevate your product or an established enterprise looking to scale, I'm here to help. Let’s kickstart our partnership with a complimentary 30 minute discussion to blueprint your pathway to success. Specialities: Full Stack Development, AI Systems Architect, AI SaaS Developer, SaaS MVP Development, Mobile MVP Development, Cross-Platform Mobile Apps, Mobile App Development, iOS Development, Scalable SaaS Architecture, AI-Powered SaaS, Flutter App Development, React Native App Development, Backend Development, Frontend Development, Mobile App Architecture, Cross Platform App Development, AI Powered Applications, API Integration, API-Driven Mobile Apps, Cloud Architecture, Production-Ready MVP, Secure APIs, OpenAI Integration, AI Workflow Automation, LLM Integration

Hello! I will transform your complex business challenges into high-performance mobile experiences that users love. 🏆 Expert-Vetted on Upwork (Top 1% of talent) 📱 Mobile Development Specialist (iOS, Android, Cross-Platform) 🧑‍💻 Full-Stack Capability (Backend + APIs + System Integration) 💯 100% Job Success Score 👍 90% of clients recommend working with me 🔁 90% long-term and repeat clients ⏳ 11+ years of professional experience ✨ Delivered 50+ high-performance, scalable, production-ready applications 💰 Reduced development costs by up to 30% through efficient architecture 🗣️ Fluent English communication 🤝 Reliable collaboration with optional team support when needed 🏥 Healthcare & Wellness In the healthcare and wellness sector, I developed mobile applications that integrate AI-driven diagnostics, telemedicine consultations, wearable data tracking, and personalized health insights, increasing patient engagement by 40%, reducing consultation time by 25%, and improving treatment efficiency by 35%. 🎓 Education & E-Learning In the education sector, I built mobile platforms that combine adaptive learning systems, real-time assessments, live classes, and gamified experiences, boosting student engagement by 50%, improving knowledge retention by 30%, and scaling user capacity by 3x. 💳 Finance, Banking & Payments In the finance sector, I engineered mobile applications that support secure transactions, digital wallets, budgeting tools, fraud detection, and real-time analytics, reducing transaction failures by 20%, increasing processing speed by 35%, and enhancing security compliance by 40%. 🛒 E-commerce & Marketplaces In the e-commerce sector, I developed mobile applications that integrate product discovery, personalized recommendations, secure checkout systems, order management, and performance optimization, increasing conversion rates by 25%, boosting user retention by 30%, and reducing cart abandonment by 20%. 🚚 Logistics, Mobility & On-Demand Services In the logistics and mobility sector, I built mobile solutions that enable real-time tracking, GPS-based route optimization, ride-booking, delivery management, and live communication, improving delivery efficiency by 35%, reducing route time by 20%, and increasing operational productivity by 30%. 💬 Social, Dating & Community Platforms In the social networking sector, I developed scalable mobile platforms that include real-time messaging, content sharing, AI-based matching and recommendations, and community engagement features, increasing daily active users by 45% and boosting engagement time by 40%. 🎬 Media, Entertainment & Gaming In the entertainment sector, I created mobile applications that deliver streaming, content discovery, multiplayer gaming, and personalized recommendations, improving user session time by 50%, reducing buffering time by 35%, and increasing retention by 25%. 📊 SaaS, Productivity & Enterprise Solutions In the SaaS sector, I developed mobile applications that streamline workflows through task automation, collaboration tools, analytics dashboards, and cloud synchronization, increasing team productivity by 40%, reducing manual work by 30%, and improving system performance by 35%. 🔐 Security, Identity & Compliance In the security sector, I engineered mobile solutions that incorporate biometric authentication, end-to-end encryption, secure APIs, and real-time threat detection, reducing security incidents by 45% and improving authentication speed by 30%. 📡 IoT, Smart Systems & Automation In the IoT sector, I built mobile applications that connect and control smart devices, process real-time sensor data, and enable automation and remote monitoring, improving system efficiency by 35% and reducing downtime by 25%. ⛓️ Blockchain, Web3 & Digital Assets In the blockchain sector, I developed mobile applications that support decentralized transactions, digital wallets, smart contract interactions, and asset management, reducing transaction latency by 30% and increasing system transparency and security by 40%. 🏡 Real Estate, Travel & Lifestyle Services In the lifestyle sector, I created mobile platforms that combine property search, booking systems, location-based services, and personalized recommendations, increasing booking conversions by 30% and improving user engagement by 35%. 🌾 Industry-Specific Solutions (AgTech, Legal, Insurance, HR) In specialized sectors, I developed mobile applications that address domain-specific needs such as crop monitoring, case management, claims processing, and recruitment automation, improving process efficiency by 40% and reducing operational costs by 25%. ------------------------------------------------------------------------------------------------------------------------ Ready to take your product to the next level? 🚀 Let's schedule a brief discovery call to see if we are the right fit for each other. 🤝✨

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 👑 🚀 100% Job Success 💯 🌟🌟🌟🌟🌟 All 5 Star ratings ✨ 🥇 Top 1% of talent on Upwork 🏆 💪 8+ Years of Mastery Skills in Mobile, Web, AI Apps 👌 ⏰ 3,000+ hours on Upwork 🕒 🎯 50+ Successful Projects 🎖️ 👨‍💻 I am a highly skilled mobile and web app developer with a passion for conquering complex challenges.
🥇I possess extensive experience in in-demand technologies, including:
 • iOS Development (Swift, SwiftUI, Objective-C) • Android Development (Java, Kotlin) • Cross-platform Development (Flutter, BloC, GetX, Dart) • Front-End Development (React, WordPress) • Back-End & APIs Development (PHP, Laravel, CodeIgniter, NodeJS, Firebase, Amplify) • UI / UX / Logo / Icons (Adobe AI, Photoshop) • Mockups & Wireframes (Figma, Sketch) • Artificial Intelligence (AI, GPT) 🏆 I have an insatiable hunger for new projects and thrive in collaborative environments, bringing your ideas to life. 💯
 🕵️‍♂️ Are you seeking a professional full stack developer? 😎 Look no further! 👀 MY PRIORITIES: ✅ Quality assurance ✅ Bug free product ✅ Pixel perfect product ✅ No stress ✅ Attention to detail ✅ Committed to deadlines ✅ Hard working ✅ Honest ✅ Responsible Available full time, more than 40 hours per week

✅ Upwork Top Rated & Verified Mobile Developer Apple App Store Rankings: #74 Overall | #5 Sports | #25 “What’s Hot” | #11 Productivity ✔︎ 5-star rated | 100% Job Success | 15+ years experience ✔︎ 75+ projects completed | 50+ apps published to Apple App Store / Google Play ✔︎ Extensive iOS and Android experience (Swift, Objective-C, Kotlin, Java) Creating a modern app is a challenging task, so having someone to help you navigate through the many complexities of not only creating the app, but also getting it live on the store is necessary. I realize how important this project is to you, and with my experience and track record I will be your advocate throughout the entire process. Communication is key to the way that I develop software. With proper communication you can feel confident that all aspects of the app development are moving in the right direction. I will keep you aware of the apps’ progress both with frequent communication by phone/email/Zoom and with consistent updates that can be downloaded and installed on your devices. You are the expert on what the app needs and only you know what is going to work for you and your users. As a former teacher, helping people reach their goals comes naturally to me. I’m looking forward to helping you create the next great app! ------------------------------------------------------------------------------------------------------ Apps developed in these app store categories: Productivity, Medical, Health & Fitness, Sports, Utilities, Education, Games, Music, Books, Business, Lifestyle, Reference, Shopping, News, Navigation, Photo & Video, Food & Drink, Social Networking, Entertainment Large clients include: Stanford University, Monster Digital, UC Davis, Allegheny Health Network, Schroeder Publishing Co, Washington Suburban Sanitary Commission, Cambridge Health Alliance, VICIS Sporting Goods **Additional information available at my company’s website twosuntraders.com.

📱💻🖥️⚒️ Seasoned software engineer with years of experience in materialising ideas & concepts into reality. I love what I do, and do what I love. I strive to be bigger than myself by helping enrich the lives of others. 🧬 MODUS OPERANDI: ✅ Robust & carefully thought out solutions, instead of quick & dirty ones, to achieve the highest standards in the long term ✅ Adherence to Apple's Human Interface Guidelines & industry-leading standards such as DRY, SOLID & AGILE to deliver the best and most responsive products in the least amount of time possible. ✅ Extend beyond development in Xcode to include Unit & UI Testing, Performance Analysis via Instruments, and deployment to TestFlight, FastLane, AppCenter and AppStore 🧑🏻‍💻 SKILLS: ✔️ Languages: Swift | Objective C | C | C++ ✔️ UI Technologies: SwiftUI | UIKit | AppKit ✔️ Networking: Vapor [Server Side Swift] | Alamofire ✔️ Data Flow: Combine | Swift Concurrency ✔️ Software Architectures: MVC | MVVM | Redux | VIPER ✔️ Apple Frameworks: CoreData | ARKit | RealityKit | Network Extension | AVFoundation | Photos | Contacts | UserNotifications | MapKit | CoreLocation | StoreKit | IOKit | ObjCRuntime ✔️ 3rd Party Frameworks: Firebase | Twilio | Google ✔️ Project Management: Asana | GitHub Projects | JIRA ✔️ Comms: Slack | Google Chat 🏆 ACCOMPLISHMENTS: ⭐️ Connected Over: Development of full-fledged VPN apps for iOS & macOS using OpenVPN, IPSec & IKEv2 protocols ⭐️ AlbumSaver: A Photo deduplication macOS & iOS app to scan all photos and videos and save them onto a proprietary flash drive ⭐️ Editable: A macOS application to annotate videos, animate the annotations, and export the videos. ⭐️ Buddyng: A social media application that provides a forum for travellers to connect, and inspire the community. I have worked extensively with the team in Brighton and it's been stellar working with them ⭐️ CoachBot: An EdTech app for students to assess their progress in learning, and gamify the experience ⭐️ espressoFlowHelper: The underlying driver that enables touch and stylus inputs to a Mac from a proprietary display. I have had the pleasure of meeting and working with team espresso in person for a brief duration in Sydney and it was simply amazing. ⭐️ Snap Display: A Display Management app to control Orientation, Arrangement & Zoom for macOS and Windows ⭐️ SideLine Scout: An iPadOS App for recording streams of videos for sports athletes. ⭐️ PowerKeys: An app to add Shortcuts for functionality in Lightroom Classic For full stack development & Software Development, I have collaborated with a team to handle other relevant skills required, including UI/UX conception, Android app and backend development. Now enough about me! Let's connect to discuss your requirements & ideas, and bring them to life! 🔥