Костянтин

KOSTIANTYN VOLKOV
IOS DEVELOPER

[open contact info](look above in the "contact info" section) Ukraine
[open contact info](look above in the "contact info" section) 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.

Freelance iOS Developer
Self-employed | Remote
Feb 2022 - Sep 2025
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.
Solved performance and memory issues (image caching pipelines, reduced re-renders, stable long
sessions).

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.
And more...

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