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DriveCheckUA

Own products · App Store release · Android v1.0.0 on GitHub

DriveCheckUA shows regional air raid alerts to drivers in Ukraine on iPhone, CarPlay, and Android, with an on-device AI summary on iPhone. Built with AI agents on both platforms, from planning to release. Directed the coding agents and reviewed their changes. On iOS, verified behavior with deterministic tests and device checks before release. On Android, every pull request passed an independent AI code review before his approval. Architected the iOS client, on-device AI integration, and CarPlay UI. Swift code classifies the alert status, and the model writes the summary text from the facts it is given. The AI integration checks model availability, limits generation time, handles cancellation, validates output, and falls back deterministically. Also built home-screen and secondary-region widgets, a Control Center control, App Shortcuts, a Live Activity, and StoreKit 2 subscriptions with purchase verification and unit tests. All targets build in Swift 6 language mode with complete data-race checking. An earlier bounded agent/tool runtime, tested by a 38-case scripted evaluation corpus covering tool selection, execution budgets, malformed results, injection-like inputs, cancellation, and deadlines, was later removed from the app. AI agents built the Android app and a backend through the same loop: spec first, and CI fails when a requirement has no test. Released on the App Store, and Android v1.0.0 as a signed APK on GitHub. A Google Play release is in preparation.

  • Integrated an on-device Foundation Models summary with validation and fallback
  • Added widgets, a Live Activity, and StoreKit 2 subscriptions in Swift 6 language mode

SwiftUI · Swift Concurrency · CarPlay · Core Location · MapKit · URLSession · Apple Foundation Models · LLM Integration · Structured Outputs · Tool Calling · Guardrails · Prompt Injection Testing · AI Evaluation · Swift Testing · StoreKit 2 · In-App Subscriptions · AI-Assisted Development · Agentic SDLC · Dependency Injection · Claude Code · Codex · Coding Agents · Context Engineering · Deterministic Verification · Human-in-the-Loop Engineering · WidgetKit · Live Activities · App Intents · Actors · Sendable · Swift 6

App Store · GitHub · Android on GitHub

Privacy

DriveCheckUA - Onboarding with Get Started DriveCheckUA - No Alert status for Lviv Oblast with the alert map of Ukraine DriveCheckUA - Air Raid Alert status for Kharkiv Oblast with nearby regions and the alert map

OneCart Family

Own products · App Store release

OneCart Family is a shopping list that a family shares through iCloud. Built and maintained with AI agents. Led the coding agents that built it, reviewed their changes, and investigated defects. Led architecture, data synchronization, and release verification. Core Data uses private and shared CloudKit stores with CKShare invitations. Edits are saved locally first, then synced to iCloud. The app handles membership changes, duplicate records, and recovery when cloud account deletion fails. WidgetKit snapshots and App Intents support widget actions. XCTest regression suites cover cart state, sharing, persistence, synchronization errors, and deletion recovery. Released on the App Store and still being developed.

  • Implemented Core Data and CloudKit persistence, CKShare invitations, and offline edits
  • Added widget actions and account-lifecycle flows with regression tests

Swift · SwiftUI · Swift Concurrency · Core Data · CloudKit · CKShare · WidgetKit · App Intents · XCTest · Offline Persistence · Synchronization Recovery · AI-Assisted Development · Agentic SDLC · Dependency Injection · Claude Code · Codex · Coding Agents · Agentic Workflows · Deterministic Verification · UserNotifications · Actors · Sendable

App Store · GitHub

OneCart Family - Welcome and Sign in with Apple OneCart Family - Shared cart grouped by category with completed items OneCart Family - Settings with cart sharing, an invite link, and app icon choice

Apple Watch Voice AI: R&D demo

GlobalLogic

An R&D demo for the customer's executives explored a hands-free voice assistant on Apple Watch for field workers. Owned the Apple Watch client and its iPhone relay end to end in a team of seven. Designed and implemented watchOS interaction flows, an iPhone relay for live audio and WebSocket traffic, and structured-response mapping within the output format agreed with the AI team. Each structured reply mapped to a known screen or action. After delivering the demo, evaluated an AI-assisted iOS development workflow, checking agent-generated code against Jira requirements and visual references. Delivered the final TestFlight build with its codebase and project documentation.

  • Implemented a custom emergency flow on watchOS
  • Built the voice conversation interface and an iPhone relay for WebSocket communication and live audio
  • Translated structured AI commands into UI actions on the device
  • Implemented work-site maps, hazards, and navigation across the watch and iPhone

SwiftUI · WatchKit · Swift Concurrency · WatchConnectivity · URLSessionWebSocketTask · AVFoundation · Audio Streaming · watchOS · AI-Assisted Development · VelocityAI · Xcode · TestFlight · Structured Outputs

Birmarket: marketplace and loyalty

PASHA Holding

Birmarket, called Umico until July 2025, is a PASHA-ecosystem marketplace with over 2 million customers. Its operator, Competo, has been a PASHA Holding subsidiary since March 2020. Worked on the Loyalty team alongside mobile, backend, QA, and product specialists while the iOS team grew from about five to twenty developers. Developed shopping and loyalty features, extracted shared modules, and later owned the multi-host Premium Subscription SDK on iOS. Company context · About Birmarket. Birmarket, the Birbank banking app, and the M10 payment wallet integrated the same remote Swift package. Each host handled authentication, session lifecycle, and token refresh, then passed a scoped access token through a small public API. The SDK managed its own networking. Proposed PostHog and designed the subscription SDK's own analytics layer, separate from the hosts' Firebase analytics. Built the slide-based subscription onboarding that replaced a long scrolling page. A/B tests cut it from five screens to three, which raised new-subscriber conversion to about 7-8%. Created remote-configuration flags and handled them in code, such as the flag that switched between payment-gateway versions. Redesigned screens shipped behind kill switches that could return a single screen to its old design. Wrote unit and integration tests covering how subscription and loyalty benefits change prices, cart state, and final totals. Configured Bitrise build, test, and code-signing steps in the development, testing, and release workflows. Handed the SDK over while it was live in production in all three host apps.

  • Reimplemented Premium Subscription as a configurable multi-host SDK distributed as a Swift package
  • Defined host/SDK API boundaries with backend and other teams
  • Carried about seven of the app's 30+ feature modules through extraction, and broke cyclic dependencies by moving shared business logic, such as discount recalculation, into small modules behind protocols
  • Traced an abrupt crash to a retain cycle between a timer and a player delegate with the Memory Graph Debugger and the Leaks instrument, and removed scroll freezes by moving network calls off the main thread

UIKit · Auto Layout · SwiftUI · Swift Concurrency · Swift Package Manager (SPM) · Modular Architecture · Clean Architecture · MVVM · SDK Development · Unit Testing · Integration Testing · CI/CD · Bitrise · Xcode Instruments · A/B Testing · Agile · Feature Flags · Remote Configuration · APNs · LocalAuthentication · Face ID · Product Analytics · Firebase · PostHog · Dependency Injection · Crash Analysis · AI-Assisted Development · Xcode · XCTest · Memory Management · Performance Optimization · Background Tasks · UserNotifications · Combine

App Store

Birmarket - premium marketplace home Birmarket - loyalty state Birmarket - contrasting product state

Drinkit: coffee ordering app

Drinkit

Drinkit is an app-first coffee brand within Dodo Brands. Worked in a product team of about twenty people across mobile, backend, design, QA, product, and hardware. Brought an existing mobile team of three iOS and two Android engineers into Drinkit and built the iOS app with them. Shaped features with product management and chose the initial architecture together with the other iOS engineers. The app used MVP with coordinators, repository and service layers, and Swift Package Manager modules. Owned the dynamic menu, the app's signature feature: the backend held a deliberately rich catalog, and a client-side constructor composed each customer's menu from it by time of day and by preferences collected at first launch and after orders. Implemented its looping drink videos, offline caching of menu data and videos, and background downloads through a background URLSession. Drink customization relied on ingredient dependencies, option availability, and backend pricing parameters. Implemented much of that functionality, integrated backend-selected offers, and displayed order status through polling. Integrated a payment SDK built by another engineer. The app connected customer orders to backend preparation state and in-shop pickup displays. Worked with A/B tests, feature flags, and remote configuration, and took part in the business decisions made from A/B test results. Launched the app with the first coffee shop, and the chain grew to eight locations during two years of development.

  • Built and released the iOS app with two other iOS engineers for the first coffee-shop launch
  • Developed and refined drink customization as the product grew
  • Integrated contextual offers using shared client and backend data
  • Displayed order-preparation status through backend polling

Swift · UIKit · Auto Layout · Combine · Swift Package Manager (SPM) · GCD · OperationQueue · MVP · Coordinator · AVFoundation · AVPlayer · File-system Caching · Payment SDK Integration · Unit Testing · Integration Testing · URLSession · REST APIs · APNs · LocalAuthentication · Face ID · A/B Testing · Feature Flags · Remote Configuration · Alamofire · Dependency Injection · Swinject · GitLab CI · CI/CD · App Store Delivery · Xcode · XCTest · Background Tasks · UserNotifications

App Store

Drinkit smart pickup counter with order displays Drinkit - order screen Drinkit - drink customization

PLAYHERA: esports tournaments

SOLVVE

PLAYHERA was an established international esports platform for managing tournaments, teams, players, and results. Worked in the SOLVVE iOS team on the existing app. Developed tournament standings, profiles, and news features in Swift and UIKit with RxSwift. Reviewed teammates' code. Shipped the features in App Store updates.

  • Developed tournament-management features within the established feature architecture

Swift · UIKit · Auto Layout · RxSwift · Reactive UI · Code Review · Alamofire · VIPER · Dependency Injection · Swinject

App Store

PLAYHERA - primary tournament screen PLAYHERA - detail state PLAYHERA - secondary state

Fintech

Alchemy: physical gold trading

Alchemy (contract)

Alchemy was an app for trading physical gold, redeemable at the company's branches. As the only iOS developer, built the first version with the backend team, then handed it over to a new iOS developer. Owned the client app across KYC onboarding, portfolio tracking, and buy and sell flows. Integrated a third-party KYC SDK, Stripe, and Apple Pay into the purchase flow. Handed over an app ready for production.

  • Built authorization, KYC onboarding, gold balances, price charts, and buy and sell flows in UIKit
  • Configured push notifications and Face ID authentication

Swift · UIKit · Auto Layout · Combine · MVVM · KYC SDK Integration · Stripe · Apple Pay · APNs · LocalAuthentication · Face ID · REST APIs · Alamofire · Dependency Injection · Swinject

Electus: mobile wallet

Startup project, 2018

Electus was an early-stage startup building a mobile wallet app. Built the iOS app from scratch within the startup team. Implemented wallet creation, import, and balances behind Touch ID and Face ID, and tracked transaction status against network data. Exchange features and a broader portal stayed product plans outside the delivered MVP. Delivered an internal TestFlight MVP with wallet functionality, charts, and a news feed.

  • Mentored a junior developer
  • Displayed assets, balances, and charts

Swift · UIKit · Auto Layout · Touch ID · LocalAuthentication · Face ID · APNs · Transaction Tracking · Alamofire

Earlier client work

ALERT: law-enforcement resilience training

Amconsoft

ALERT provided resilience training for law-enforcement users through guided exercises, audio practice, and reminders. Developed the iOS app independently from the supplied flow, design, and audio assets. Implemented the guided exercises and their audio in UIKit. The audio content was stored on the device. Released the app on the App Store.

  • Built audio playback with seeking on AVFoundation
  • Scheduled local reminders with UserNotifications

UIKit · Auto Layout · AVFoundation · Audio Playback · UserNotifications · Local Reminders · App Store Delivery

ALERT splash - Advanced Law Enforcement Resilience Training ALERT category selection - design mockup ALERT One Way Observe exercise with audio - design mockup

Eastern Union: commercial real-estate app

GBKSoft

Eastern Union was an established commercial real-estate app. Worked in the GBKSoft development team. Made scoped feature changes and fixes in its Swift/UIKit codebase. Worked from the client's real-estate documentation and requirements. Delivered client-requested changes to the live app.

  • Translated domain documentation and client requirements into screen behavior

Swift · UIKit · Auto Layout

App Store

easternunion.com

Eastern Union eCALC calculators - screenshot Eastern Union Blended Mortgages - screenshot Eastern Union IRR calculator - screenshot

Tap4Parking

Tap4Parking

Tap4Parking was a municipal parking app for Kyiv that helped drivers find facilities and check available spaces. Developed the iOS app independently. Implemented the map interface, location handling, availability display, and directions to facilities. Showed parking locations and free-space counts on the map and as the driver approached a facility. Chose Google Maps SDK after comparing MapKit, Google Maps, and Yandex Maps for map detail and coverage. Explored indoor positioning with proposed floor-mounted transmitters in a separate prototype. Released the parking-search app on the App Store.

  • Displayed parking availability and directions to a facility
  • Compared map providers and explored indoor positioning in a prototype

Objective-C · UIKit · Auto Layout · Google Maps SDK · Core Location

Facebook · tap4parking.com (archive)

Tap4Parking - map search in a car (product photo) Tap4Parking iOS map - parking clusters and pins in Kyiv Tap4Parking - find parking on map (product photo)

Green Riding Hood: interactive book

App Store release

Green Riding Hood is an interactive read-aloud children's book for iOS. Contributed to the iOS app. Built the book's iMessage app. The iMessage app extended the book to Messages. The app was released on the App Store.

  • Built the book's iMessage app

iOS

App Store

Green Riding Hood - interactive story scene Green Riding Hood - illustrated story scene Green Riding Hood - read-aloud story scene