Oleksandr

Oleksandr Sisov
Senior iOS Developer
Kyiv, Ukraine (Remote) | [открыть контакты](см. выше в блоке «контактная информация») | [открыть контакты](см. выше в блоке «контактная информация»)
LinkedIn: [открыть контакты](см. выше в блоке «контактная информация»)

SUMMARY
Senior iOS Developer with 14+ years of experience building high-performance, real-time
mobile applications using Swift, SwiftUI, and modern iOS architectures. Proven track record in
designing scalable modular systems and leading architectural decisions in fintech, health, and
streaming domains.
Experienced in developing performance-critical and hardware-integrated applications,
including BLE-based biometric tracking and low-latency real-time communication. Strong
focus on Clean Architecture (MVVM, VIPER), concurrency, and maintainability.

CORE SKILLS
●​ Languages: Swift, Objective-C
●​ Frameworks: SwiftUI, UIKit, Combine, CoreData, Firebase, WebRTC
●​ Architecture: MVVM, VIPER, Clean Architecture, Modular Architecture
●​ Concurrency: Swift Concurrency (async/await, actors)
●​ Performance: Memory optimization, profiling (Instruments), background processing
●​ CI/CD & Testing: Fastlane, Jenkins, Bitrise, XCTest, Unit/UI/Snapshot Testing
●​ Networking: REST APIs, real-time data handling

PROFESSIONAL EXPERIENCE
Senior iOS Developer — Rakuten Viber | Feb 2025 – Feb 2026
●​ Develop fintech features for Viber Pay and wallet systems.
●​ Implemented secure KYC/KYB flows.
●​ Contributed to modular Swift architecture in distributed teams.
Senior iOS Developer — Devlight (Health Module) | Aug 2025 – Dec 2025
●​ Designed modular Swift Package for biometric tracking.
●​ Integrated BLE devices for real-time data and feedback.
●​ Built scalable components using Clean Architecture.
iOS Developer — Software MacKiev | Apr 2025 – Aug 2025
●​ Refactored legacy codebase and improved stability.
●​ Fixed critical bugs and improved performance.
Senior iOS Developer — Mapletton Hill | Nov 2023 – Feb 2025
●​ Designed offline-first architecture with background sync.
●​ Optimized large datasets using CoreData and async processing.
●​ Built map-based UI for data visualization.
iOS Developer — Andersen Lab | Sep 2021 – Mar 2025
●​ Led modular architecture design using VIPER and mentored 2–3 developers.
●​ Integrated auto-generated REST API layer (+40% dev speed) and reduced merge
conflicts via XcodeGen.
●​ Reduced module creation time by 80% with internal CLI tool.
Senior iOS / Tech Lead — ZeusElectronics | Jan 2016 – Sep 2021
●​ Led real-time streaming apps using WebRTC (latency <150ms).
●​ Processed 1M+ BLE events monthly (+70% sync performance).

PORTFOLIO
●​ Podorozhnyk Pharmacy: App Store Link
●​ Simplot Advisor 3.0: App Store Link
●​ Kulu Individual: App Store Link

EDUCATION & ADDITIONAL INFO
●​ Education: Bachelor’s Degree in Computer Science, National Technical University of
Ukraine (KPI).
●​ English: Intermediate.
●​ Availability: Open to remote B2B/contract opportunities.