Seraphim K.

Senior iOS engineer with 7+ years of experience building and shipping apps in Swift and SwiftUI. $300K+ earned on Upwork with 100% Job Success. I take apps from idea to App Store, or join an existing project and keep it moving. I've built products on my own and worked inside teams of up to 12 engineers. I use AI tools like Claude Code every day to move faster, while architecture, code review and quality stay my responsibility. Selected work: • Thea: smart ring app for iOS and iPad, launched at CES 2025 and delivered in 12 weeks. • Citizen CZ Smart YouQ: smartwatch app, launched at CES 2023. Built the first version, then led a team of three iOS engineers. • Qaly: ECG app from a Stanford startup. 200K+ sign-ups, 4.7★. • Corecircle: social fitness app. Took over mid-project. 4.8★ from 2,700+ ratings. • Mobile carrier app with 575K+ App Store ratings, on a 12-person iOS team. Stack: Swift, SwiftUI, UIKit, Swift Concurrency, Combine, MVVM, TCA, Core Data, SwiftData, StoreKit, Firebase, XCTest, Fastlane, Xcode Cloud. "He took over for a prior developer and immediately picked up where the project left off, without a hitch." – Client Send me a short description of your project, and I'll reply with questions and an estimate.