Ivan

Ivan Antonov
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | Lisbon, Portugal
Portfolio: https://ivanantonovportfolio.netlify.app/ | LinkedIn:[open contact info](look above in the "contact info" section)

Education
Master of Science in Computer Science
12/2023
Kyiv National University of Trade And Economics•Kyiv, Ukraine

Bachelor of Electrical, Mechatronics and Robotics Engineer 06/2022
National Technical University Polytechnic Institute • Kyiv, Ukraine

Skills
Swift, C++, Python, SwiftUI, UIKit, AppKit (macOS), Combine, Swift Concurrency (Async/Await, Actors),
GCD, NSLock & Thread Safety, MVVM, MVC, Clean Architecture, Coordinators, Modular Architecture,
TCA (The Composable Architecture), VoIP, SIP Protocol, PortSIP, WebRTC, CallKit,
AVFoundation (Audio/Video), StoreKit 2 (In-App Purchases), MapKit, CoreLocation, UserNotifications,
RESTful API, GraphQL, WebSockets, URLSession, Codable, JWT, Firebase (Firestore, Auth, Analytics),
Core Data, Realm, Keychain Security, Unit Testing (XCTest), Snapshot Testing, UI Testing, CI/CD,
Fastlane, GitHub Actions, Git, SPM, Xcode Instruments (Memory Graph, Time Profiler),
SOLID Principles, Design Patterns.
Languages: English, Ukrainian, Russian.

Experience
Founder & iOS Engineer
Dream Apps • Lisbon, Portugal 11/2025 - 11/2025
Led the end-to-end product delivery of a social party game, managing a cross-functional
team (Android, Design) and ensuring feature parity across platforms.
Engineered a high-performance video engine using AVFoundation and AVPlayerLooper
with aggressive preloading, achieving zero-latency seamless video loops.
Implemented robust monetization infrastructure using StoreKit 2 (Async/Await),
handling complex multi-tier subscriptions, trial eligibility, and secure receipt validation.
Optimized app launch time to under 3 seconds by implementing concurrent background
initialization and memory-aware caching strategies using GCD.

iOS Developer
URBSOFT • Lisbon, Portugal 06/2025 - 11/2025
Co-architected a mission-critical macOS VoIP client (SwiftUI, Combine, PortSIP)
handling 1000+ daily calls, achieving 99.9% uptime and zero crashes in production.
Designed a thread-safe concurrency model using NSLock and isolated serial queues to
manage complex SIP states, eliminating race conditions common in high-load telephony.
Built a resilient REST API layer (10+endpoints, JWT) with real-time CRM synchronization,
ensuring 100% call tracking accuracy and reducing manual data entry by 95%.
Developed advanced desktop features including floating windows (NSPanel) and BLF
monitoring for 50+ extensions, boosting operator call answer rates by 40%.

iOS Developer
Dogh owl Games • Lisbon, Portugal 11/2024 - 06/2025
Developed a scalable mobile application from scratch, taking full ownership of the
modular MVVM architecture, UI implementation, and backend integration.
Engineered a real-time chat module using Swift Concurrency (async/await) and
Firestore, ensuring low-latency messaging and smooth UI performance.
Implemented complex geospatial features using MapKit and CoreLocation with custom
clustering, optimizing rendering performance for large datasets.
Integrated the full Firebase ecosystem (Auth, Firestore, Storage) to secure user data and
enable instant synchronization across devices.
Electronic Engineer
MaxApplianceRepair • Toronto, ON 03/2024 - 09/2024
Diagnosing and troubleshooting appliances with a 90% success rate on first assessment.
Repaired over 30 devices monthly, restoring full functionality to circuits and controllers.
Maintained 100% traceability of repairs and parts for 60+ jobs. Prepared detailed
estimates, reports, and customer documentation.

iOS Developer
MAXDigital•Kyiv, Ukraine 10/2022 - 09/2023
Delivered pixel-perfect user interfaces for multiple commercial projects using UIKit and SwiftUI, strictly
adhering to complex Figma design systems.
Collaborated closely with backend teams to integrate RESTful APIs, ensuring robust error handling and
seamless data flow.
Maintained and optimized existing codebases, refactoring legacy components into modern Swift to
improve app stability.
Managed multiple project streams simultaneously, consistently meeting strict deadlines in a fast-paced
outsourcing environment.

System Administrator
Ascania•Kyiv,Ukraine 07/2021 - 08/2022
Diagnosed and resolved hardware/software issues.
Installed, configured, and administered a network of servers.
Created and managed user accounts, enforcing secure access permissions and enhancing data security.
Installed, configured, and administered a network of servers, computers, Wi-Fi.

Project Manager
Q&QGroup•Kyiv, Ukraine 09/2018 - 09/2019
Developed project plans, successfully delivering over 15 projects on time and within budget.
Organized and conducted data collection, enhancing accuracy through advanced statistical analysis.
Coordinated a team of 1O+ members.
Prepared clear reports and presentations, streamlining client reviews.