Andrey D.

I build and rescue React Native and iOS apps that have to keep working after launch. 13+ years in mobile, including a major European bank's new banking app and Shred, a fitness app with Apple Watch. 100% Job Success, $100K+ earned on Upwork. WHAT I'VE SHIPPED → A major European bank (via EPAM), Mobile Technical Lead. New React Native banking platform, from early delivery through production launch. I built the bridge that runs the bank's live Cordova plugin (auth, Keychain, security checks, push, analytics) inside React Native, so the new app takes every bank update without a rewrite. I owned mobile CI/CD and releases, and supported 5+ feature squads on build, signing and distribution. → Shred, Lead iOS Engineer. Fitness app with workouts, sensors, Apple Watch, HealthKit and AI coaching. Build time down 60%, ~99.9% crash-free sessions, 155 XCUITest scenarios built from scratch, 4.88 App Store rating. I reworked phone-to-watch communication, which had been the buggiest part of the app. → Screwfix (via EPAM), React Native Technical Lead. Led 5 engineers on a high-traffic UK retail app. → FarmCommand by Farmers Edge, Lead React Native Developer. Digital farm data app built for in-field use: field weather and forecasts, imagery-derived map layers, crop health change detection, scouting and harvest tools. Led 6 engineers and cut launch time by 92%. → On Upwork: 1,800+ hours with one client as a React Native mentor (5 stars), and 1,200+ hours of iOS and Android work with another. WHAT I CAN DO FOR YOU → Build a React Native or native iOS app, from first version to App Store and Google Play → Take over an unstable app, including one built with AI tools: find the crashes, fix the fragile core, ship updates → Apple Watch apps: HealthKit, workouts, phone and watch sync → Move a Cordova app to React Native, or write native modules in Swift, Objective-C and Kotlin → Set up CI/CD and releases: Fastlane, GitHub Actions, Jenkins, signing, TestFlight → Secure auth and banking-grade app security: SSL pinning, Keychain, Keystore → Fix slow builds, slow launches and crash rates HOW I WORK I start with a small first milestone that works end to end, so you see real progress early. Small PRs, tests with the code and regular builds you can try. I use AI coding tools under written rules and code review: you get the speed, and I stay accountable for what ships. If something isn't worth building yet, I'll tell you. WHAT CLIENTS SAY "I had an emergency to deal with and got desperate for help ASAP. Andrey was able to go above and beyond in helping me with not only the main problem I was having - but other fixes too!" Tell me what your app does and what's going wrong or what comes next. I'll come back with questions and a suggested first milestone.