I build production mobile apps and the backends that power them – from architecture to App Store. When a project needs system design before code, I deliver that too. Over 20 years I've shipped iOS and Flutter apps across industries that demand reliability: medtech (RYAH — BLE-connected medical inhalers with real-time device logging), fintech (mobile payment platform, leading a team of 4), POS systems (Clover — dual-pricing app with Flutter web + Kotlin Android + Firebase backend), automotive HMI (Ferrari F152 at Luxoft), and enterprise banking (Deutsche Bank). I work as a sole developer or lead small teams, and I own the full delivery lifecycle: architecture, development, CI/CD pipelines (automated builds to Slack and TestFlight on git push), and release management. My experience in project coordination and requirements analysis allows me to step into PM and BA roles when the project calls for it. What I bring that most mobile devs don't: → Server-side Swift with Vapor — I maintain Passage, an authentication framework in the vapor-community GitHub org. JWT, OAuth, passwordless login, email/phone verification, and account linking as composable modules. → Full-stack Firebase — Cloud Functions, Firestore, Realtime Database, Hosting, Messaging. Not just "I've used Firebase" — I architect complete backends with it. → Deep native integration — CoreBluetooth/BLE, HealthKit, PassKit, NFC. At RYAH I redesigned the command throttling layer and cut Bluetooth packet loss by 95%. The kind of work that breaks most mobile developers. → Cross-platform development — I build and ship Flutter apps to both App Store and Google Play (B2B Merchants PR, Sapphire Blessings). At anyIP I designed and maintain client SDKs across Swift, Android, Flutter, Unity, and React Native, all bridging to a Rust core via FFI/JNI and distributed through SPM, Maven, pub.dev, and npm. → SwiftUI architecture — I prefer to lean on what the platform provides: native dependency injection via Environment, @Observable for state management, and AsyncSequence/AsyncStream for reactive data flow. No heavy third-party frameworks where Apple already solved the problem. → Solution architecture — when the build can't start until the design is right, I deliver: system architecture documents, component diagrams, API specifications, data flow diagrams, integration strategies, tech stack recommendations, and implementation roadmaps. ERD, DFD, UML, BPMN when the team needs them. I'm an active open-source contributor with 65 public repositories on GitHub. 📱 Mobile: Swift, SwiftUI, UIKit, Objective-C, Flutter/Dart, Android (Kotlin, Java), React Native, Unity 🖥 Backend / Web: Node.js, TypeScript, Vapor (Swift), Express.js 🗄 Databases: Firestore, Realtime Database, MongoDB, PostgreSQL, MySQL, Redis, Realm, Couchbase ☁️ Infrastructure: AWS, Google Cloud (CloudRun), Docker ⚙️ DevOps & Tools: Git, GitHub Actions, Bitrise, Codemagic, Fastlane, Xcode, Firebase 🧠 Practices: Clean Architecture · FRP State Management · Reactive & Functional Programming · TDD/BDD · CI/CD · DDD · SOLID (single-responsibility, open-closed, dependency inversion and friends) · GRASP (assigning responsibility to the right objects — information expert, creator, low coupling, high cohesion)

o 17+ years of experience building iOS apps – one of the original App Store developers (July 2008) o 22+ years successfully working with dozens of clients from my REMOTE office, as a telecommuter o 30+ Apps published in the Apple App Store and Enterprise o 25+ years of professional software development experience o 20+ years of experience with networking protocols & methodologies: REST, JSON, HTTP, TCP, UDP o 20+ years of experience with source control systems: Git, SVN, CVS, RCS, VSS, Perforce o Keen ability to distill complex concepts and systems into easily understandable terms o Outstanding analytical and problem-solving skills o Ability to work independently and as part of a team o Exceptional attention to detail, remarkably fast learner, excellent communication skills. o Personable, enthusiastic, conscientious. o Languages: Objective-C, C++, Swift, Java, Kotlin, JavaScript, PHP, Python, Perl, C, C#. o Operating Systems: iOS, watchOS, macOS, Windows, Linux, Unix. o IDEs: Xcode, Android Studio, Visual Studio, Eclipse. o Experience with API architecture design. o Strong understanding of multi-threaded and concurrent applications. o Expert understanding of all aspects of the iOS provisioning workflow. o Experience developing in an agile and test-driven environment. o Experience creating dynamic libraries with CocoaPods. o Experience with third-party libraries, APIs, and SDKs. o Hands-on experience with UIKit, CoreData, CoreGraphics, CoreAnimation, Cocoa design patterns. o Experience with a wide variety of analytics platforms, including Firebase (Google), Flurry (Yahoo), AWS, comScore, Nielsen, Adobe, MOAT (Oracle). o Ability to bring designer’s creations to life, with pixel-perfect implementations. o Experience in video and media-based development projects. o Working knowledge of Android development (Android Studio, Java, Kotlin, XML, Gradle, CircleCI).

More than 15 years experience in software technology. While in recent years I have shifted my focus to software development, the majority of my career has been leading business teams in customer facing roles. This gives me a unique perspective on development and greater understanding of business requirements when working on a development project. My most recent software development projects include: - a social voting application - an adventure focused deal finder application with geo-mapping - a storybook activity app for pediatric patients & their families in hospital - a peer to peer rental marketplace complete with a reservation & peer review systems My preference is to build mobile apps in Google's Mobile App SDK (Flutter) which allows me to build native iOS and Android apps from a single codebase. Benefits of using Flutter include: - exceptionally fast turnaround times - significant cost savings for my clients - a single and clean codebase making future development easier and cheaper for clients - native integrations with Google's serverless applications, cloud hosted databases & storage I can also develop native apps in Swift/Objective-C or Kotlin/Java if required. In addition to mobile app development, I also have experience working with: - Django applications - developing & implementing machine learning models in Python with scikit-learn - utilizing TensorFlow transfer learning techniques on Computer Vision models for image recognition engines - junior web developer working primarily with the React framework If you have any specific questions, please reach out. Cheers, Jeremiah

⭐ Top Rated | 100% Job Success | Senior Mobile Engineer with 15+ years of experience Are you looking for a reliable developer to turn your app idea into a finished, working product? I build high-quality, scalable mobile apps for Android and iOS, backed by secure backend systems — and I deliver the whole stack myself. With 15+ years of software engineering, I specialize in full-cycle mobile development. My expertise covers: ✅ Native Android — Kotlin & Java, Jetpack Compose, MVVM, clean architecture ✅ Cross-platform apps — Flutter (Android + iOS from one codebase) ✅ Backend — Spring Boot, REST APIs, JWT auth, PostgreSQL, Docker ✅ Secure & encrypted apps — end-to-end encryption, SQLCipher, privacy-first ✅ Augmented reality — ARCore image recognition & tracking (5★ rated on Upwork) ✅ On-device AI / ML — TensorFlow Lite, image classification, real-time camera ✅ Real-time audio — low-latency DSP, recording, waveform, music apps ✅ Delivery & marketplace platforms — customer + driver + admin + backend What you get working with me: • Clean, documented, maintainable code — and full ownership • Clear communication and fast responses • Production-ready quality: proper error handling, security, no shortcuts • One developer for both frontend and backend — no coordination overhead From a single feature to a complete platform with its own backend, I deliver projects end to end. Whether you have an idea, a prototype, or an existing app that needs to scale — I can help. 📩 Message me with your project and I'll reply with a clear plan, timeline and honest advice. Let's build something great.

I lead mobile product delivery end to end, building iOS apps with SwiftUI as well as cross-platform apps using Flutter. If you need ownership (not just someone to write code), I can take your mobile product from early MVP to a stable App Store release. For SwiftUI-focused needs, I also take selective individual engagements where strong iOS expertise is critical. What I work on: • Native iOS apps built with SwiftUI (clean architecture, performance, polished UX) • Cross-platform apps with Flutter (iOS & Android) • Backend/API integrations, authentication, payments, push notifications How I work: • Clear scope and milestone-based delivery • Weekly progress updates or demos • Strong focus on maintainable code and predictable releases Team model (important): I am your main point of contact and personally handle architecture and critical parts of the app. When projects require more speed or parallel work, I scale delivery with my small in-house team (design and development support), while remaining fully accountable for the outcome. Typical engagements: • MVP builds with fixed-price milestones • Monthly product support or feature development ($12k–$20k / month, depending on scope) • SwiftUI feature work, refactors, and improvements (solo) If this sounds aligned, share your project goal and current state, and I’ll respond with a clear plan and realistic next steps.

I help startups and businesses build and launch mobile and web applications — from idea to production. My expertise includes: • Flutter (iOS, Android, Web) • React & Next.js applications • Firebase & Supabase backends • SaaS MVP development • API integrations and payment systems • UI/UX implementation and performance optimization I focus on delivering clean, maintainable code, clear communication, and reliable long-term support. US-based software developer operating through Smerdoff Technologies LLC, a California-registered company. Fully insured business: • General Liability: $1,000,000 per occurrence / $2,000,000 aggregate • Professional Liability (E&O): $1,000,000 per claim / $1,000,000 aggregate • Certificate of Insurance (COI) available upon request If you need a reliable developer who can build and launch your app — let's talk.

Funded startups hire me to take a mobile app from plan to a revenue-generating launch on the App Store and Google Play. The last app I led as mobile developer now does $10.8M ARR with 80,000+ paying subscribers and a 5.0 rating on both stores. In 7+ years on iOS and Android, apps I've built have generated $15M+ in revenue for my clients, serve 110,000+ paying users, and hold 5.0 ratings across 10,000+ App Store and Google Play reviews. You might be shipping your MVP, rebuilding a V2 your first version outgrew, or holding an AI-built prototype that's stuck before launch. Anyway, I take it the rest of the way: architecture, build, store approval, and the payment, compliance, and edge-case work that decides whether an app survives real users. 𝗣𝗿𝗼𝗼𝗳 (𝗮𝗹𝗹 𝘃𝗲𝗿𝗶𝗳𝗶𝗮𝗯𝗹𝗲 𝗼𝗻𝗹𝗶𝗻𝗲) - PawSquad: pet care subscription app. Lead mobile developer. 80,000+ paying users, 3,300+ reviews, 5.0 on both App Store and Google Play. $10.8M ARR. - Jasomi: fintech app, built end to end. 10,000+ active users. - ConnectingKnox: local business discovery app. 193 paying businesses onboarded in month one. 𝗛𝗼𝘄 𝗜 𝘄𝗼𝗿𝗸 1. Blueprint. Every feature, cost, risk, and timeline on paper before any code. You know exactly what you're paying for. 2. Weekly builds. You see and test a working app every week. No black box, no "it's almost done." 3. Launch. I handle App Store review, Google Play, servers, and monitoring, so the tech side runs without you. Along the way I catch the things first builds usually miss: bad UX, subscription edge cases (failed renewals, refunds, family sharing), and compliance gaps, before they become expensive. 𝗦𝘁𝗮𝗰𝗸 * React Native, Expo, and Flutter for one codebase on both platforms; * Swift and Kotlin when native is the right call. * Node.js, Supabase, and Firebase backends. * In-app purchases and subscriptions with RevenueCat and Stripe. * Push notifications, live chat, maps and geofencing, and AI features with the Claude and OpenAI APIs. 𝗠𝗲𝘀𝘀𝗮𝗴𝗲 𝗺𝗲 𝘄𝗶𝘁𝗵 where you are now: idea, designs, AI prototype, or a live app. You'll get an honest answer on whether I'm the right fit and what to build first.

I ❤️ solving iOS problems - big and small. You can hire me to fix a bug, implement a complex feature, integrate ChatGPT or other services or frameworks, implement a design, or write a whole new mobile app from scratch. WHAT I OFFER • I prefer setting clear milestones from the beginning of the project and delivering on time. • Communication is a top priority for me, I post regular updates on my progress. • I write top-quality, maintainable, and robust code. • I freelance full-time, and you have my full attention on your project. EXPERIENCE I’m a seasoned iOS developer with 12 years of experience making 5-star-rated apps for the iPhone, iPad, and Apple Watch. In my previous role as a full-time senior developer, I was responsible for the development of business and productivity apps - document processing, cloud storage, and online collaboration. Before I fell in love with iOS I had 10 more years of experience developing mobile applications for Symbian, Palm, and Windows Mobile. I am familiar with most standard iOS APIs such as UIKit, Foundation, SwiftUI, Combine, animations, in-apps, push notifications, MapKit, StoreKit, StoreKit 2, Sign In with Apple, etc. I can help with App Store Review guidelines and issues. I’ve used many third-party frameworks like Firebase, AdMob, Facebook SDK, Flurry, AppsFlyer, etc. Dev tools: Xcode, Git, Figma, Jira, Trello, TestFlight, Jenkins. Don’t hesitate to drop me a message. I’d love to discuss your project.

Senior independent iOS / Apple-platform engineer with 10+ years shipping for product teams across operations platforms, healthcare, fintech, media, and B2B SaaS. I partner with founders of B2B operations platforms — equestrian, fitness, healthcare, last-mile logistics, automotive — on multi-month engagements. Not single-feature gigs. Currently in 2-year partnership with a B2B operations platform in the equestrian industry: shipped v1 → seed round closed, architected v2 multi-app ecosystem (barn operations, pro tools, end-user app, payments, orders, billing) → next round in progress. ═══════════════════════════════════════════ FOCUS INDUSTRIES ═══════════════════════════════════════════ ▸ Equestrian operations ▸ Fitness facility operations ▸ Healthcare operations ▸ Last-mile logistics ▸ Automotive services Adjacent operations-tech (case-by-case): agtech, field service, construction tech, hospitality ops, mobile professionals. The common thread: software where digital meets physical, and mobile is mission-critical for operators in the field — drivers, technicians, trainers, practitioners, field workers. ═══════════════════════════════════════════ WHAT I DO ═══════════════════════════════════════════ → Lead end-to-end iOS / Apple-platform delivery for B2B operations platforms (typically post-Series A, $1-15M raised) → Architect multi-app ecosystems (operator + admin + end-user apps) that survive 3+ years of iteration — not just MVP-grade → Embed as fractional CTO when founders need senior Apple judgement without hiring full-time → Audit existing iOS codebases before fundraising rounds or major hires ═══════════════════════════════════════════ WHAT I DON'T DO ═══════════════════════════════════════════ → Single-feature gigs under $3k or 2-week sprints → MVP-from-scratch for non-funded ideas → Cross-platform (React Native, Flutter) — I work native iOS → White-label "rent my GitHub stats" arrangements ═══════════════════════════════════════════ ENGAGEMENT MODES ═══════════════════════════════════════════ ▸ PROJECT PARTNERSHIP (3-9 months) Lead engineer for full delivery cycle. When scope demands more hands, I assemble small senior teams from a network of senior contractors I've worked with for years. ▸ FRACTIONAL CTO RETAINER (6-18 months) 1-3 days/week embedded with founder. Architecture, hiring, code reviews, technical strategy, investor-readiness on the technical side. ▸ ADVISORY DIAGNOSTIC (1-2 weeks) Codebase audit, architecture review, build-vs-buy assessment. Often the start of something longer. ═══════════════════════════════════════════ TECHNICAL STACK ═══════════════════════════════════════════ Apple platforms: iOS, iPadOS, macOS, watchOS, tvOS, CarPlay, Vision Pro Languages: Swift, Objective-C UI: SwiftUI, UIKit Concurrency: async/await, Combine, GCD Architecture: MVVM, Clean Architecture, Coordinators Backend: Supabase, REST/GraphQL APIs Operations-tech: Offline-first sync, GPS/routing, payments, scheduling, multi-app ecosystems Tooling: Xcode, Git, CI/CD (GitHub Actions, Xcode Could, Fastlane, Bitrise), TestFlight, App Store Connect ═══════════════════════════════════════════ Available for 3+ month engagements. If you're a founder of a B2B operations platform thinking about scaling your iOS / Apple-platform side — let's talk.

I build Flutter and React apps that ship to the App Store, Google Play, and the web - on time, on budget, and built to scale past 100K users. In 6 years I've delivered 50+ production apps for startups and enterprises across the USA, UK, and Europe - in wellness, healthcare, fintech, gaming, and IoT. Not side projects or MVPs that fall apart. Full products with clean architecture, weekly builds, and post-launch support. ━━━━━━━━━━━━━━━━━━━━━━ WHAT I BUILD ━━━━━━━━━━━━━━━━━━━━━━ ✅ Flutter apps (iOS + Android) — clean architecture, fast UI, App Store ready ✅ AI-integrated apps — OpenAI, Gemini, Claude API; real features, not demos ✅ React & Next.js web apps — component-driven, SEO-optimised, scalable dashboards ✅ BLE & IoT apps — Bluetooth device pairing, real-time sensor data, hardware control ✅ AR experiences — ARKit / ARCore inside Flutter ✅ Full MVPs — discovery → design → development → deployment, end-to-end ━━━━━━━━━━━━━━━━━━━━━━ WHO I WORK BEST WITH ━━━━━━━━━━━━━━━━━━━━━━ → Funded startups who need a demo-ready MVP in 6–10 weeks → Product teams replacing a vendor who missed deadlines or shipped poor code → Businesses automating manual workflows with smart mobile & web apps → Founders who want one senior engineer across Flutter + React, not five vendors ━━━━━━━━━━━━━━━━━━━━━━ WHY CLIENTS CHOOSE ME ━━━━━━━━━━━━━━━━━━━━━━ Most developers write code. I solve business problems with code. Before writing a single line, I validate your idea, challenge assumptions, and map the fastest path to launch - saving you weeks of rework and thousands in wasted development. I've managed teams of 15+ developers and understand project scope, budget control, and deadline delivery, not just Dart syntax. 100% Job Success Score across 12 completed contracts. 1,600+ hours billed. Every project delivered. ━━━━━━━━━━━━━━━━━━━━━━ TECH STACK ━━━━━━━━━━━━━━━━━━━━━━ Mobile: Flutter · Dart · React Native · Swift Frontend: React · Next.js · TypeScript · Tailwind CSS Backend: Node.js · Firebase · AWS · MongoDB AI: OpenAI API · Gemini · Claude API Payments: Stripe · Twilio Hardware: BLE / Bluetooth · ARKit · ARCore APIs: REST · WebSockets · GraphQL ━━━━━━━━━━━━━━━━━━━━━━ WHAT YOU GET ━━━━━━━━━━━━━━━━━━━━━━ 📦 Clean, maintainable codebase — no spaghetti you'll pay to fix later 📦 Weekly builds + progress updates — no black-box development 📦 8 weeks free post-launch support — I don't disappear after delivery 📦 No advance payment required — pay as we build 📦 Open to long-term contracts and contract-to-hire arrangements ━━━━━━━━━━━━━━━━━━━━━━ READY TO BUILD? ━━━━━━━━━━━━━━━━━━━━━━ Message me or send an invite. Tell me what you're building - mobile, web, or both - and I'll respond within hours with a clear scope, timeline, and cost estimate. No vague quotes.