I help businesses take ideas from concept to a scalable, production-ready product or improve existing apps that need a more solid foundation. Most of my work falls into: - Building new apps from scratch (greenfield projects) - Turning MVPs into scalable, maintainable products - Refactoring or stabilising existing apps I’ve worked across the full lifecycle and can take ownership of architecture, development and delivery. Tech: - iOS (Swift) - Android (Kotlin) - Flutter (when appropriate) If you’re looking for someone who can build your app properly from day one or take an existing app and move it forward, feel free to get in touch.

Senior iOS engineer at EltexSoft, a Top Rated Plus agency with 200+ five-star reviews. 8+ years shipping production iOS applications. $200K+ earned on Upwork with 100% Job Success across every contract. I build iOS apps that ship, scale, and stay maintainable. My work includes apps featured on the App Store, enterprise tools for Fortune 500 teams, health tech platforms, POS systems, and media creation tools used by millions. NOTABLE WORK — Unfold: media creation app (Apple featured, millions of users) — POS and payment system for a reservation platform ($100K+ contract) — iOS affirmation app: multi-year engagement, 2,400+ hours delivered — Free Stuff Finder: #2 US coupon app (1M+ downloads, iOS) — MOTTIV: endurance training app with Strava/Garmin integration WHAT I BRING — Production Swift/SwiftUI: MVVM, Combine, async/await, SPM — Full App Store lifecycle: TestFlight, CI/CD (Fastlane, GitHub Actions), ASO — Integrations: HealthKit, CoreBluetooth, ARKit, MapKit, StoreKit, CoreData — Payments: Stripe, in-app purchases (StoreKit 2) — Backend coordination: REST APIs, GraphQL, WebSocket, Firebase I work in a dedicated squad model through EltexSoft — you get me plus QA, backend support, and a delivery manager. Long-term engagements preferred.

I design and ship production macOS and iOS apps in Swift and SwiftUI, going deeper than most: virtual cameras, system audio capture, Accessibility-API automation, BLE device integrations, and the App Store release pipelines that get it all out the door. What I've shipped: Consumer iOS/macOS apps on the App Store — pet-safety monitoring with CloudKit two-device pairing, a SwiftUI menubar calculator, BLE health-device apps that reverse-engineer defunct hardware to keep it alive, and voice-transcription utilities monetized with StoreKit/RevenueCat System-level macOS — CoreMediaIO virtual cameras, ScreenCaptureKit capture, on-device AI overlays (WhisperKit + Foundation Models), and deep Accessibility-API automation to drive native apps that expose no API Production backend + clients — a Node.js/TypeScript WebSocket backend (Redis + PostgreSQL, horizontally scaled behind an ALB) bridging real-time messaging to CRMs, with native macOS and Windows clients Cross-platform desktop ecosystems — coordinated releases across macOS (Swift), Windows (.NET/WPF, Flutter), and Safari/Chrome/Firefox extensions Open source — I maintain forks of well-known macOS tools and a C++ routing engine, so I'm at home in large, unfamiliar codebases How I work: I take full ownership from concept to shipped product — architecture, implementation, signing/notarization, App Store submission, and release automation. I also step into technical-lead roles: setting architecture, aligning multi-repo systems, and bringing structure to projects that have outgrown their original design. My background spans CNC/CAD/CAM and manufacturing, which is why I'm especially effective on software-driven workflow optimization — turning manual, error-prone processes into reliable automated tools. Best fit for clients who need senior-level execution and decisive progress: someone who owns a hard problem end to end rather than waits for specs. If that's what you need, message me — happy to talk specifics.

Looking for an expert-vetted app developer who doesn't just burn hours and waste your money? You've found someone with: - 11 years of experience delivering high-quality, successful apps to clients - a specialty in monetization and UX design, because I have my own revenue generating apps, and these are the biggest "money levers" - and, a habit of never pressuring you to do anything you don't need. If you are looking to: - create a new app, - make your existing app into a best-in-class beast, - or grow revenue with a subscription model, ... you are in the right place. I take a test-and-iterate approach to all things. We start with the smallest bet that we can make and see if it produces the desired results. Then, we learn what works and what doesn't; and make progressively bigger bets until we get the big payoff. This philosophy has led to successful app launches for me, my past employers, and most important of all, my past clients. Go for someone that will actually deliver, with full transparency in communication. Feel free to send an invite - after all, what's the worst that could happen?

Mobile App Developer since 2014 working on mobile apps across both Android and iOS, working in both small startups as well as large enterprises. I have worked primarily in the health, medical devices, fitness and travel sectors.

🚀 Senior Software Engineer | Team Leader | iOS, macOS, visionOS, watchOS | Swift, Objective-C, C++ | AR, AI 🔹 11+ Years of Experience | Master's in AI & Bachelor's in CS | PhD Researcher in Applied Linguistics Passionate software engineer with 11+ years of professional experience in developing high-quality applications for iOS, macOS, visionOS, Windows, and Linux. I specialize in Swift, C, C++, Objective-C, Objective-C++, and Rust programming languages building efficient, scalable, and maintainable solutions. Holding a Master’s degree in Artificial Intelligence and currently pursuing a PhD in Applied Linguistics, where I research OCR for handwritten texts, I bring a unique combination of AI, NLP, and software engineering expertise to projects involving text recognition and automation. 🛠 Tech Stack & Expertise 🔹 Programming Languages 💻 Swift | Objective-C | Objective-C++ | C++ | C | Rust 🔹 Development Tools 🔧 Xcode | Instruments | Terminal | Qt Creator | MS Visual Studio | VS Code 🔹 Architectures & Design Patterns 📐 MVC | MVVM | MVVM+Coordinator | VIPER | TCA | UDF 🔹 iOS/macOS Frameworks & Technologies 📱 UIKit | SwiftUI | Combine | Observation | AVFoundation | CoreFoundation | CoreGraphics | CoreData | CoreBluetooth | CoreLocation | MapKit | PushKit | CallKit | WidgetKit | XCTest | SPM 🔗 Third-party: Realm | RxSwift | SQLite | Alamofire | WebRTC | Twilio | Vonage | Firebase | AWS | Stripe | Google Maps | MapBox | Cocoapods | CarPlay | SiriKit 🔹 Networking & Communication 🌐 TCP/IP | OSI | REST API | GraphQL | WebSockets | VOIP | WebRTC 🔹 Databases & Storage 🗄 MySQL | SQLite | CoreData | SwiftData | Realm 🔹 C++ Libraries ⚙ Qt | Boost | STL 🔹 Scripting & Automation 📜 Bash | Fastlane 🔹 Operating Systems 📂 iOS | macOS | visionOS | watchOS | Android | Windows | Linux (Ubuntu, CentOS) 🔹 CI/CD & Version Control 🔄 Git | GitFlow | SVN | Jenkins | TestFlight | Fastlane | CircleCI | Github actions 🔹 Project Management & Collaboration 📌 JIRA | Trello | Redmine 🔹 UML & Software Design 📊 UML diagrams for system architecture 🔹 Languages 🗣 Ukrainian (Native) | English (Fluent, C1 - CAE Certified) I’m excited to collaborate on challenging projects and build innovative software solutions. Let’s discuss how I can help bring your vision to life! 💬 Let’s Connect!

With 6+ years of experience in iOS development, I have worked in various companies, from startups to large-scale product companies like Kcell and AlfaBank in Kazakhstan. Over the years, I’ve taken on leadership roles, mentoring developers, conducting workshops, and running internship programs to help teams grow. My core philosophy is to create maintainable, well-structured, and efficient projects. I focus on writing clean, scalable code that ensures long-term stability and ease of iteration. Whether leading a team or working hands-on, I prioritize best practices, performance optimization, and architectural excellence. I am always open to new challenges, whether it's leading a team, improving an existing codebase, or building a high-quality iOS app from scratch. Let’s work together to bring your ideas to life with robust and elegant solutions.

I build production iOS apps for founders who need an engineer that thinks about the product, not just the ticket. Most of my clients are early-stage founders or small product teams who have either a half-built app they need to finish, or a clear idea they want turned into something shippable. I own the full execution: architecture, data layer, AI integration, App Store submission. What I bring to a project: — 12 published apps across iOS, macOS, and watchOS — Deep experience with SwiftUI, SwiftData, HealthKit, CloudKit, WatchConnectivity, and on-device AI — RevenueCat and StoreKit 2 for monetization — OpenAI and Apple Intelligence integration — Clean, maintainable code you can hand off to a team later I work best with founders who want a technical partner, not someone who just closes tickets. If you need someone to think through architecture decisions, push back on bad ideas, and ship fast — that's what I do. Currently studying AI Engineering at Stanford (2024–2027). If you have an iOS product to build or a stuck codebase to rescue, let's talk.

Experienced Software Engineer | Mobile, Mac Desktop, and Web Development Welcome to my page! With extensive experience in iOS, macOS, watchOS, Android, and web development, I specialize in designing and building high-quality applications that meet business goals and exceed user expectations. What You Can Expect When Working With Me: ✔ High-quality, scalable, and efficient applications – professionally built for long-term success. ✔ App Store and Play Store compliance – ensuring smooth approvals and avoiding rejections. ✔ Effective collaboration and project management – experienced in Jira, Trello, Git, and Agile workflows. ✔ Reliable communication and support – responsive at any time to provide timely solutions. ✔ Continuous learning and innovation – always exploring new technologies to enhance project outcomes. My passion is to create impactful apps and websites that gain recognition while helping clients achieve their goals. I am constantly refining my skills, exploring new trends, and optimizing my development process to deliver the best results. Let’s build something great together! Looking forward to collaborating. Best regards, Leo

I help founders and product teams ship and stabilize production systems across mobile + backend—especially when reliability, security, payments, and “edge cases in the real world” matter. I’m a former Capital One Staff Engineer (Payments) and have delivered work for organizations including the Library of Congress. I’m comfortable operating in production safely, debugging messy systems, and modernizing workflows without rewriting everything. Recent and notable work • CakeClub (iOS + Firebase): Turnaround to production-ready. Built a Firebase Cloud Functions v2 backend for budget calculations and transaction sync, secured Plaid token storage with encryption keys protected in Google Secret Manager, implemented Firebase App Check, integrated RevenueCat, added Crashlytics/Analytics, and created an admin panel with role-based access. Established QA + Production environments and CI (Xcode Cloud + GitHub Actions). • Genie AI: Contributed to shipping and stabilizing production workflows under real constraints, focusing on reliability and execution. What clients hire me for • Production stability: crashes, retries/double submits, inconsistent state, payments/webhooks • Shipping and launch closeout: TestFlight/internal testing → App Store / Play Store • Mobile + backend alignment: when client behavior and backend reliability interact under poor networks If you want a senior engineer who communicates clearly, works independently, and delivers production-safe improvements, I’m a good fit.