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Vitalii Maksymliuk

@vitaliimaksymliuk

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iOS Engineer at Copotential (Digiguys Apps) who built AI-powered productivity apps and professional camera experiences.

Poland

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At Copotential (Digiguys Apps), I built Focus on Five, an AI-powered productivity app where users turn goals into weekly priorities through conversation with Dexter. I also designed and built No Don't Do It, a behavioral intervention app for iOS and watchOS with real-time synchronization and haptic nudges.

I developed DIGIX AMR1 with manual camera controls and RAW image processing, and completed interactive widgets for Collage Frame Widget. Across my iOS work, I’ve also built StoreKit monetization features, integrated Apple Music with MusicKit, and used AI-assisted development tools while supervising and validating generated code.

Experience

Work history, roles, and key accomplishments

iOS Engineer

Copotential (Digiguys Apps)

Oct 2020 - Jan 2026 (5 years 3 months)

Collaborated with product management and designers in Agile/Scrum environments, independently managing full development lifecycle for multiple production apps simultaneously. Delivered projects from concept through complex migrations and mid-development takeovers.

Swift SwiftUI UIKit AVFoundation Core ML OpenAI API

WidgetKit

AppIntents

CloudKit

MusicKit

Core Data Swift Data Realm UserDefaults Keychain REST APIs JSON Async Await Push Notifications OAuth XCode IOS SDK Git GitHub Gitlab

SF Symbols

TestFlight App Store Connect Cocoapods Swift Package Manager Code Review Agile Jira Data Encryption

Apple Human Interface Guidelines

Responsive Design Animation

iOS Developer (Contract)

Upwork

Jun 2022 - Sep 2022 (3 months)

Architected full-featured music player with Apple Music integration using MusicKit framework. Designed MVVM architecture with Combine for reactive state management and implemented custom audio visualization.

MusicKit

MVVM Combine AVFoundation Core Animation SwiftUI Swift

Trainee iOS Developer

Devlight

Oct 2018 - Sep 2019 (11 months)

Developed loyalty card and bonus tracking application from concept through App Store launch. Contributed to international logistics company application, implementing features and collaborating with senior developers on code quality and architectural patterns.

iOS Swift

App Store Launch Support

Code Review Collaboration