Yevhenii Petrenko
From: Ukraine
Location: Odesa, UA
On Useme since 7 August 2026
About me
Senior iOS/macOS developer, 5+ years of commercial experience building native apps in Swift — from architecture to App Store release and ongoing support.
I have four of my own apps live on the App Store, designed, built and published entirely by myself. So I understand not only the code, but what actually drives an app's revenue: onboarding, paywalls, subscription conversion and Apple review.
What I can help with:
- iOS apps built from scratch, or an MVP on a tight timeline - Extending, refactoring or taking over an existing codebase - Bugs, crashes and performance issues - In-app purchases and subscriptions (StoreKit 2, Adapty) - App Store submission and handling Apple rejections - AI integrations (ChatGPT, Gemini) in mobile apps
Stack: Swift, SwiftUI, UIKit, Combine, Swift Concurrency, MVVM-C, Core Data, CloudKit, REST API, Firebase, Fastlane.
I agree scope, timeline and cost before we start, work in stages with working demos, and flag risks early.
Categories
Portfolio
AI wallpaper generator I designed, built and shipped myself. Swift/UIKit with a generation queue, error handling and result caching. Monetised with StoreKit 2 subscriptions: free-tier limits, trial and paywall. Live on the App Store.
Scans paper receipts with the camera and extracts line items, totals and dates using Vision. Purchase history and spending summaries stored in Core Data. My own product, taken from idea to App Store release.
Voice note app with automatic transcription and full-text search over history. Built in Swift/UIKit on AVFoundation: background recording, audio session handling, local storage. Designed, developed and published solo.