Portrait of Yaroslav Tkachenko, Swift Developer

Yaroslav Tkachenko

I build comprehensive mobile applications on Swift, focusing on clean code and user experience. Fully developed and released "SubSage"—a subscription manager using SwiftUI, Core Data, and WidgetKit.

// you can also see it on my Github page
const githubLink = "https://github.com/yaroslavtkachenko-dev";
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Experience & Skills

> Development Experience

iOS Developer on Upwork

August 2025 - Present | Remote Work

  • Developed commercial app with computer vision and text recognition
  • Integrated ML Kit for OCR with support for 20+ languages
  • Optimized performance through caching and batch processing
  • Created automatic language detection system with NaturalLanguage
  • Implemented image preprocessing to improve recognition accuracy
Author of Project "DoneDay"

Personal Project | 2024 - 2025

  • Designed full-featured task management application
  • Implemented MVVM + Repository Pattern architecture with clean separation of concerns
  • Integrated Core Data with NSFetchedResultsController for handling 1,000+ tasks
  • Created reactive UI with Combine framework for real-time updates
  • Achieved 70%+ test coverage with XCTest
Author of Project "SubSage"

Personal Project | 2024 - 2025

  • Fully designed the application architecture using SwiftUI
  • Implemented local data persistence with Core Data
  • Integrated expense analytics visualization using Charts framework
  • Set up local notification system for upcoming payments (UserNotifications)
  • Developed multi-currency support with automatic conversion

> Technical Skills

SwiftUI Core Data NSFetchedResultsController Charts UserNotifications CIImage Filters Git REST API Figma HTML CSS Bootstrap ML Kit Vision Framework NaturalLanguage MVVM Repository Pattern XCTest Combine async/await CoreGraphics AVFoundation Performance Optimization

Portfolio

SubSage iOS App
SubSage: Smart Subscription Manager

An elegant and intuitive iOS application designed to let you easily manage all of your monthly and annual subscriptions.

SwiftUI Core Data WidgetKit Charts UserNotifications
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Text Purifier Tool
Text Purifier

A tool for cleaning and formatting text that helps remove unnecessary characters and structure content.

JavaScript HTML CSS Text Processing
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DoneDay iOS App
DoneDay: Task Manager

Full-featured iOS application for task management with MVVM architecture and support for 1,000+ tasks.

SwiftUI Core Data MVVM Combine XCTest
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PageSieve Tool
PageSieve: Smart Contact Finder

A tool for searching contacts on web pages.

HTML CSS JavaScript
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