Віктор

VIKTOR MANDRYK
HIGH-PERFORMANCE IOS ENGINEER / IOS TEAM LEAD

CONTACT PROFILE
@vityam05 Senior iOS Engineer / Team Lead with 5+ years of experience delivering high-performance,
scalable, and user-centric mobile apps. Specialized in Swift, SwiftUI, UIKit, and advanced
[відкрити контакти](див. вище в блоці «контактна інформація») architectures.
Strong track record of leading teams, improving app performance, integrating complex
Ukraine, Remote systems, and shipping features that directly impact business metrics. Experience across e-
commerce, healthcare, communication, and AR/AI products.
@vityam01 Focused on product quality, measurable results, and building maintainable architectures.

Vitya Mandryk
WORK EXPERIENCE

SKILLS Oobyte DEC 2024 -NOV 2025
Team Lead / Senior iOS Engineer
Highload E-commerce & Social Platform
Languages & Frameworks
Lead iOS engineer responsible for technical direction, team performance, and architecture
Swift Combine evolution.
SwiftUI GCD
Responsibilities and Key Accomplishments:
UIKit Concurrency Led and mentored a 20-member iOS team across multiple feature streams.
Architected scalable modules using Swift, SwiftUI, UIKit, Combine, Realm,
Architectures REST/GraphQL.
MVVM VIPER Integrated Stripe, Facebook SDK, AppsFlyer, Firebase, full ATT compliance.
Improved app performance: -45% crash rate, -60% home screen load time (2.8s → 1.1s).
MVP Modular Increased DAU by 32% through performance-focused UI refactoring and analytics-driven
MVC Architecture optimization.
Delivered 5 major monetization features without critical issues post-launch.
Databases / Persistence
Realm Core Data
CodeBridge JUN 2024 – OCT 2024
iOS Developer
Networking Highload E-commerce & Social Platform
Developed a health & coaching app connecting trainers with users.
REST GraphQL
Responsibilities and Key Accomplishments:
Integrations Implemented core modules using Swift & SwiftUI.
Stripe Firebase Integrated HealthKit + Apple Watch tracking with real-time activity updates.
Added Stripe payments, push notifications, progress dashboards.
AppsFlyer Push Notifications Improved user engagement by 25% via optimized reminders & UX flows.
Facebook SDK ATT

Advanced iOS NonameDigital NOV 2023 – JUN 2024
ARKit AVFAudio iOS Developer
Multiple Products
SceneKit HealthKit Delivered several independent apps with significantly faster release cycles.
CoreML Apple Watch Responsibilities and Key Accomplishments:
CoreAnimation AutoClicker: reduced repetitive task time by 15% (Swift, CoreAnimation, GCD).
Dog Translator: improved audio pipeline → +18% user satisfaction.
CI/CD & Tools Sign Language Translator: achieved 99% gesture detection accuracy (ARKit, CoreML,
Firebase).
Fastlane Unit/UI Testing Shortened delivery cycle by 20% through modularization and CI improvements.
GitHub Actions Git
NOTABLE D4Group JUN 2022 – DEC 2023
iOS Developer
ACHIEVEMENTS Communication Platform (Care2Talk)
Responsibilities and Key Accomplishments:
Implemented VoIP calling, subscription payments, offline mode, push notifications.
Led the largest iOS team in
Increased recurring revenue by 15% and boosted elderly user engagement by 20%.
company history (20 people) to a
Reduced bug reports by 30% through rigorous testing and crash analytics pipelines.
successful release.
Apps with 500K+ combined
downloads. ITStolytsa NOV 2022 – FEB 2023
Strong performance optimization Swift Teacher
background: crash reduction, cold-
Responsibilities and Key Accomplishments:
start improvements, rendering
optimizations. Taught Swift from beginner to intermediate level through hands-on projects.
Delivered AR/AI features Created custom course materials and real-world coding scenarios.
Helped students achieve career goals and transition into iOS developer roles.
recognized for high detection
accuracy & user adoption.
Consistently improve delivery WebAcademy SEP 2021 – NOV 2023
speed, code quality, and team iOS Mentor
productivity.
Responsibilities and Key Accomplishments:
Guided students through group and 1-on-1 mentoring sessions.
Provided code reviews, project support, and interview preparation.
SOFT SKILLS Ensured adherence to best coding practices and industry standards.

Leadership & Team Management Five System Development OCT 2021 – MAY 2022
Effective Communication iOS Developer
Problem-Solving & Critical Thinking Game Development (SceneKit)
Ownership & Accountability Responsibilities and Key Accomplishments:
Product-Oriented Mindset
Mentorship & Coaching Orcade (3D game): +20% retention after gameplay rework.
Cubes puzzle game: +15% engagement; implemented leaderboards & subscriptions.
Decision-Making
Used SceneKit, CoreAnimation, MVVM, StoreKit, Firebase.
Collaboration
High Attention to Detail
Time Management & Prioritization Lyst MAY 2020 – JUL 2020
iOS Developer (Volunteer)
Eco-Commerce
Responsibilities and Key Accomplishments:
LANGUAGES Redesigned UI which increased adoption by 20%.
Added donation tracking & eco-product highlighting.
English - Upper-Intermediate
Ukrainian - Native

EDUCATION

Master’s Degree in Computer Science 2023 - 2024
Vinnytsia National Technical University

Bachelor’s Degree in Computer Science 2019 - 2023
Vinnytsia National Technical University