Костянтин

KOSTIANTYN VOLKOV
IOS DEVELOPER

[открыть контакты](см. выше в блоке «контактная информация») Ukraine
[открыть контакты](см. выше в блоке «контактная информация») Telegram: @its_now_its

PROFESSIONAL SUMMARY
Product-focused iOS Developer with 3–4 years of Swift/SwiftUI experience and 1.5 years of
commercial development. Build scalable iOS applications with modular architecture, complex
navigation flows, and high-performance data-driven interfaces. Experienced in subscriptions, analytics,
app extensions, and system frameworks including WidgetKit, Screen Time API, and App Groups.

PROFESSIONAL EXPERIENCE
Ios Developer
Midnight.Works | Remote
Sep 2025 – Present
iOS Developer (NDA): shipped production SwiftUI features with focus on stability, performance,
and clean modular architecture.
Built complex navigation flows (deep stacks, sheet/fullScreenCover) with reliable gesture-back
behavior.
Integrated REST APIs and improved data-heavy screens using pagination/prefetch and offline
caching.
Implemented analytics (Firebase/Amplitude) to track key funnels and support product decisions.
Middle-Senior iOS Developer
Polorix | Remote
Jan 2024 - Sep 2025
Developed commercial iOS applications from scratch, taking products from idea and architecture
to production release on the App Store.
Owned the full app lifecycle: planning, implementation, testing, debugging, deployment, and post-
release support.
Built scalable and maintainable app architectures using Swift, UIKit, Core Data, REST APIs, and
modular design principles.
Delivered end-to-end iOS features for subscription-based and product-focused apps, including
StoreKit and RevenueCat integrations.
Worked across Apple platform technologies and system-level frameworks, including Darwin,
Objective-C, and C++ interoperability where needed.
Optimized app performance, stability, and resource usage, improving responsiveness and overall
user experience.
Integrated backend services and external APIs, ensuring reliable networking, data flow, and
smooth collaboration with cross-functional teams.
Solved complex production issues through troubleshooting, debugging, and continuous app
improvements across multiple commercial projects.
Managed App Store release process independently, including builds, signing, submission, release
preparation, and production delivery.
Freelance iOS Developer
Self-employed | Remote
Feb 2022 - Sep 2024
Delivered multiple iOS apps end-to-end: onboarding, authentication, subscriptions, push
notifications, offline caching, analytics, and App Store releases.
Built app extensions and cross-target data sharing via App Groups (widgets, keyboard, reports).
Implemented subscriptions (RevenueCat/StoreKit) and paywall flows with free-tier limits.

EDUCATION
Bachelor (in progress) - Computer Engineering
Kharkiv National University of Radio Electronics (NURE)
2024-2028

SELECTED PROJECTS
Klad: Save, Organize & Plan (SwiftUI)
https://kladapp.com | https://apps.apple.com/ua/app/klad-save-organize-plan/id6754760495
- SwiftUI app for saving and organizing content into collections (movies/books/places/etc.) with
offline cache.
- Built modular UniversalCardV2 UI and fixed complex navigation (deep stacks,
sheet/fullScreenCover, gesture back).
- Integrated REST APIs + RevenueCat + Firebase/Amplitude + APNS; improved stability on large
datasets, reduced memory usage by ~30% (pagination, image caching).

Nexyra Wi-Fi & LAN Diagnostics
- Production network utility: diagnostics, device discovery, port scan, reports, Quality Score.
- Implemented long-running tests and edge-case handling using system networking APIs; improved
reliability for extended sessions.
- Subscriptions via RevenueCat + analytics via Amplitude (incl. Session Replay) for funnel
optimization.

Aura Widgets (iOS 17+) - Photo Widgets & Trackers
- Widget builder with photo slots and interactive trackers for Home Screen.
- WidgetKit + AppIntents + App Groups storage; built safe image pipeline (resize/orientation) for
widget sizes.
- Fixed widget memory/performance issues and update edge-cases after releases.

Blockkr - Screen Time Control
- Usage monitoring and app blocking by time/steps.
- SwiftUI + Screen Time API + FamilyControls + DeviceActivityReportExtension + App Groups.
- Implemented stable cross-target data sync and daily/weekly reporting.

NureSchedule - Calendar & Timetable
- Custom SwiftUI calendar (week/month) with schedule sync from JSON API.
- MapKit routing + Look Around preview flows; improved UX for navigation scenarios.
- Optimized updates to avoid UI jumps on frequent schedule refreshes.

Superboard - Custom AI Keyboard
- Custom keyboard with voice input and quick replies.
- Swift/SwiftUI + KeyboardKit + REST AI integration + App Groups.
- Reduced input latency and ensured stable state sharing between keyboard extension and the main
app.
TECH SKILLS
Languages: Swift
UI: SwiftUI, UIKit
Architecture: MVVM, Modular Architecture
Networking: REST, JSON
Apple frameworks: WidgetKit, Darwin, Screen Time API, MapKit,KeyChain,URLSession, etc.
Subscriptions: RevenueCat, StoreKit
Analytics: Firebase, Amplitude
Notifications: APNS
Other: App Groups, Offline caching