Kostiantyn Bezzemelnyi
Senior iOS Developer
Skills
iOS
Swift
UIKit
SwiftUI
Combine
Async/Await
MVVM
MVC
MVP
SPM
CocoaPods
StoreKit
Push Notifications
AVFoundation
PDFKit
CoreData
Realm
API
GraphQL
REST API
Alamofire
Sockets
DevOps
CI/CD
Fastlane
Xcode Cloud
Git
Gitlab
Bitrise
A/B Testing and Feature Flags
Firebase
LaunchDarkly
Analytics
A/B tests
Testing
XCTest
Unit Testing
Snapshot Testing
UI Testing
Integration Testing
Architecture and Principles
Clean Architecture
SOLID
Design Patterns
TDD
OOP
Other Tools
SwiftLint
SwiftFormat
Kingfisher
Slack API Integration
Certifications
English B2 First Certificate (FCE)
Cambridge Assessment English
Issued: Jun 2021
iOS Lead Essentials Course
Essential Developer Academy
Issued: Jun 2022
Android Development Course
Online Academy
Issued: May 2021
Experience
iOS Developer
Launch Labs
Dec 2023 - Present
Remote
Developing a remote coaching app used by over 10,000 athletes with complex backend-driven UI and custom components.
Key Achievements
- Released a coaching app with 150+ backend-driven UI screens
- Implemented custom video player with HLS streaming support
- Integrated AWS S3 for storing user media files
- Automated app delivery with Fastlane and Slack changelogs
- Enhanced performance via media caching and user data prefetching
- Collaborated with cross-functional team (QA, designers, BAs)
Swift
UIKit
MVVM
REST API
GraphQL
Sockets
AWS S3
Fastlane
PDFKit
AVFoundation
Snapshot Testing
XCTest
iOS Developer
Launch Labs
Mar 2022 - Dec 2023
Remote
Worked on a relationship and wellness app with modular architecture and responsive SwiftUI UI for 5 Apple devices.
Key Achievements
- Implemented theme-aware SwiftUI UI, reducing UI bug reports by 30%
- Built modular codebase using Swift Package Manager, cutting build times by 25%
- Refactored calendar module with smooth transitions and data caching
- Developed a custom AI-based chat module
- Integrated snapshot tests for 11 onboarding and key app screens
Swift
SwiftUI
Combine
MVVM
REST API
Alamofire
SPM
Firebase
StoreKit
Snapshot Testing
Xcode Cloud
iOS Developer
EPAM Systems
Sep 2021 - Mar 2022
Remote
Developed and tested an iOS native app in a 4-person iOS team. Participated in code reviews and internal learning.
Key Achievements
- Contributed to stable native iOS app development
- Maintained high code quality through extensive unit and UI testing
- Participated in internal trainings and peer code reviews
Swift
UIKit
REST API
MVVM
Gitlab
Unit Testing
UI Testing
Integration Testing
Fastlane
SwiftLint
AVFoundation
SPM
Android Developer
NDA (Banking Startup)
Jan 2021 - Aug 2021
Remote
Developed Android screens and reusable UI components for a banking startup using Kotlin and modern architecture.
Key Achievements
- Built and maintained Android screens and navigation logic
- Integrated REST API and Firebase backend
- Worked with Jetpack and Clean Architecture
Kotlin
Android
Jetpack
Retrofit
Firebase
Koin
Clean Architecture
Gradle
Bitrise