Siddhant D.

Getting your app ready for iPhone Duo? I rebuild SwiftUI apps on the iOS 27.1 SDK so they fill the inner display instead of showing black borders, fix layouts around the fold and in Split View, and design the inner-display App Store screenshots. I'm doing the same for my own app, Duefolio (featured by MacStories), right now. 9 iOS apps shipped to the App Store under my own studio. I build native iPhone apps with AI features, and take them from idea to App Store approval in weeks, not months. I'm a solo iOS engineer and the founder of CYNQ Ventures, a mobile studio where I've designed, built, and shipped 9 apps end to end. Every part of the process you're hiring for is something I've already done on my own money and my own deadlines: architecture, UI, submission, rejection appeals, and the launch after. WHAT I BUILD • iPhone Duo (foldable iPhone) adaptation - iOS 27.1 SDK rebuild, fold-safe SwiftUI layouts, Split View support, app state kept across fold and unfold, and inner-display App Store screenshots • AI-powered features - OpenAI, Claude, and Gemini APIs wired into SwiftUI interfaces that feel native, not bolted on, plus fully on-device AI that keeps user data on the phone • Screen Time API and app blocking - one of the least documented frameworks on iOS. I've shipped it in 4 of my own apps and published an open-source Screen Time agent skill on GitHub (screen-time-api-agent-skill) • Health and motion - HealthKit, CoreMotion, AirPods head tracking, CoreBluetooth • Monetization - RevenueCat, StoreKit 2, paywalls, and rescuing subscriptions when in-app purchases break • iPhone + Apple Watch - real-time phone-to-watch sync and hardware button integrations • Launch assets - App Store screenshots, icons, and ASO copy for my own apps and for client apps HOW I WORK Bug fixes in 24–48 hours. Working prototype in 3–7 days. MVP in 1–2 weeks. You get a build you can hold in your hand every week, not a status update at the end of the month. I reply within 4 hours, flag problems before they turn into surprises, and tell you when something in your scope is a bad idea before you pay to build it. SELECTED WORK • Duefolio (featured by MacStories) - subscription tracker with on-device AI and a lifetime unlock, no bank linking • DevScroll - Screen Time app that locks distractions until you push a GitHub commit • UpRight - posture coach using AirPods motion data • StrideGate - HealthKit walk-to-unlock • NetCal - AI calorie tracking from food photos • Client project - iPhone + Apple Watch live scoring with Flic button integration Whether you need a new app built, a stuck build rescued from App Review, or a listing that actually converts - send me the details and I'll tell you honestly whether I'm the right person for it.