02 — Experience
Work history
iOS Engineer
- Maintain and support the iOS app for one of Ukraine's largest media providers
- Build features with MVVM, Combine and RxSwift for reactive data flow, and UIKit for the interface
- Collaborate closely with managers, analysts, and QA engineers to deliver the best possible user experience
iOS Engineer
- Led a cross-functional iOS team (backend, Android, design, QA), driving product decisions and technical direction across multiple products
- Shipped and maintained production apps with a 99.9% crash-free rate, serving thousands of active users in the US market
- Built UIs with SwiftUI and Swift Concurrency (async/await), keeping the main thread fully unblocked
- Owned the full data layer: REST/GraphQL networking, local persistence (CoreData, SwiftData + CloudKit), caching strategies, and offline-first architecture
- Implemented security best practices including Keychain storage, biometric authentication (Face ID / Touch ID), and AES-256 encryption
- Integrated AVFoundation (custom video player with PiP), OAuth 2.0, CoreLocation, WeatherKit, and cloud storage (Dropbox, OneDrive)
- Built AI-driven features using OpenAI APIs, reducing inference costs by ~30% while maintaining accuracy
- Developed across the Apple ecosystem: iOS, macOS, tvOS, watchOS
- Reduced image loading time by ~50% and cut memory usage by ~25% through custom caching and lazy-loading strategies
Junior iOS Developer
- Developed iOS apps using UIKit, adhering to modular architecture and presentation patterns such as MVVM and MVP
- Participated in release cycles, ensuring stability and consistency across app updates
- Collaborated with the team on debugging, performance improvements, and maintaining a clean, scalable codebase
Intern iOS Developer
- Supported existing gaming projects and implemented new screens using UIKit and VIPER architecture
- Worked with the backend via REST API
- Collaborated with the product team to discuss future features and improve user experience
