Сергій

Yavorsky Sergey
Location: Ukraine, Cherkasy
E-mail: [відкрити контакти](див. вище в блоці «контактна інформація»)
Telegram: @Sergey_Hot_UA
Phone: [відкрити контакти](див. вище в блоці «контактна інформація»)
Github: https://github.com/SergeyHotUA
Linkedin: [відкрити контакти](див. вище в блоці «контактна інформація»)
My own apps: https://apps.apple.com/us/developer/sergej-javorskij/id1582608193

Summary
Senior iOS engineer. 8 years shipping consumer apps, the last six as the senior on client
products: architecture, App Store release, and subscriptions (StoreKit, Apphud,
RevenueCat). Led a pod of 5–6, including hiring and code review. Independently operate
Declutter Photos - Robo Clean and Network Analyzer: Speed Test on the App Store, from
paywall and analytics through App Review. Use Cursor and written specs to draft code;
design, review, and the release decision stay mine.

App Store: Hands-on experience owning the full App Store release lifecycle — versioning,
phased rollouts, App Review communication, and resolving rejections — across multiple
production apps for enterprise clients.

Skills
• AI instruments: Cursor, Codex, Claude Code
• Languages: Swift, Objective-C, Lua
• UI: UIKit, SwiftUI, AutoLayout, SnapKit
• Reactive Programming: Combine, RxSwift
• Networking: GraphQL, URLSession, Alamofire, Moya
• Data: Realm, CoreData, Keychain
• Concurrency: GCD, OperationQueue, Combine, async/await
• Architecture: MVVM, VIPER+Coordinator, MVP, MVC
• App engagement: Deep links, push/local notifications, silent notification
• Analytics & Attribution: Firebase, AppsFlyer, Amplitude
• In-App Purchase: StoreKit, Apphud, RevenueCat, Adapty
• Tests: Unit Tests, A/B testing
• CodeGen: SwiftGen
• Dependencies: SPM, CocoaPods, Fastlane and Carthage
• Tools: Xcode Instruments, Git (GitHub, GitLab, Bitbucket), Postman, Charles, Figma
• Principles: SOLID, KISS, DRY, YAGNI

Experience
Umbrella IT (UK, London, remote)
Senior iOS Software Developer
June 2020 — Present 2026 (6+ years)
• Replaced VIPER with MVVM+Combine across the modules. A new feature stayed in one
folder instead of being split into View, Interactor, Presenter, and Router
• Owned App Store releases for Metro, Mary Kay, and betPawa: versioning, phased rollout,
and replies to App Review. Cleared a rejection by updating the build and resubmitting
- Led team of 5–6 iOS developers — planning, task delegation, performance review
- Designed app architecture and made key technical decisions across multiple projects
- Integrated analytics and subscription flows
- Participated in hiring: screening, technical interviews, onboarding - Conducted regular code
reviews and introduced coding standards
- Built MVP apps for pre-sale and business validation
- Integrated complex networking, analytics, notifications flows

ScaleTools UA (Kharkiv, Ukraine)
iOS Software Engineer
November 2017 — June 2020 (2 years 8 months)
• Delivered multiple commercial applications across various domains
• Worked on networking, animations, UI/UX, and data layers

MyOwnConference (Kharkiv, Ukraine)
iOS Developer
December 2014 — November 2017 (3 years)
• Developed apps with complex UI animations and custom logic
• Participated in improving data modules

Education
Kharkiv National University of Radioelectronics
MSc, Software Engineering

Professional Objective
• Team-oriented work environment;
• Interested in working on diverse projects from different business domains;
• I strive to write scalable, reusable, and well-structured code.

Work Conditions
Stable working infrastructure (energy-independent setup, backup Internet).