Remote worker with 7+ years of experience - Last seen 14 days ago

Senior iOS Developer with 6+ years of experience building scalable and maintainable applications using Swift, SwiftUI, and UIKit. I specialize in Clean Architecture, modular codebases, and robust CI/CD pipelines. I’ve led development of complex features, contributed to open-source libraries, and recently launched a full-scale fitness app (VirtusFit) from scratch — handling everything from architecture to WatchOS support and AI integrations. Passionate about performance, testing, and shipping high-quality code that lasts.

Open to remote opportunities where I can contribute with strong technical ownership, clear communication, and a product-oriented mindset.

🛂 Nationality	🇺🇦 Ukraine
🏡 Residency	🇺🇦 Ukraine
📍 Location	🇱🇹 Lithuania
Remote OK	rok.co/@kostiantyn_k
Telegram	@Kostiantyn_dev
GitHub	rayllienstery
LinkedIn	https://www.linkedin.com/in/kostiantyn-kolosov/
Skilled in	ios swift swiftui uikit combine coredata grdb watchos xcode mvvm clean architecture modular architecture reactive programming mobile dev mobile architecture dependency injection fastlane firebase git github ci cd unit testing integration testing appstoreconnect userdefaults keychain local notifications push notifications background tasks json rest api analytics performance optimization structured concurrency
Fluent in	englishukrainian
Preferred timezone	+2
Preferred annual pay (min)	$50,000/year
Preferred hourly pay (min)	$27/hour
Last seen	14 days ago
Signed up	15 days ago
Badges	👨‍💻 Remote worker 🎨 Maker 🎖 Early adopter