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Vicktor Mandryk

@vicktormandryk

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Senior iOS engineer and team lead delivering high-performance, scalable mobile apps.

Ukraine

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What I'm looking for

I seek senior mobile engineering roles where I can lead teams, improve app performance, ship measurable product outcomes, and mentor engineers.

I am a Senior iOS Engineer and Team Lead with 5+ years building high-performance, scalable, and user-centric mobile applications across e-commerce, healthcare, communication, and AR/AI domains. I specialize in Swift, SwiftUI, UIKit, Combine, and modern architectures, and I have a strong record of leading teams, improving app performance, and shipping monetization features that move business metrics.

I have led teams up to 20 engineers, reduced crash rates and load times dramatically, increased DAU and recurring revenue, and delivered complex integrations (Stripe, AppsFlyer, Firebase, HealthKit, Apple Watch). I focus on measurable results, maintainable architectures, and mentoring engineers to improve delivery speed and code quality.

Experience

Work history, roles, and key accomplishments

Team Lead / Senior iOS Engineer

Oobyte

Dec 2024 - Nov 2025 (11 months)

Led a 20-member iOS team and architected scalable modules using Swift, SwiftUI, Combine and MVVM/VIPER, reducing crash rate by 45% and home screen load time by 60% while increasing DAU by 32% and delivering five major monetization features.

Swift SwiftUI Combine MVVM VIPER Realm Stripe Firebase

iOS Developer

CodeBridge

Jun 2024 - Oct 2024 (4 months)

Developed a health & coaching app with Swift and SwiftUI, integrated HealthKit and Apple Watch tracking, added Stripe payments and push notifications, and improved engagement by 25% through optimized reminders and UX flows.

Swift SwiftUI HealthKit Apple Watch Stripe Firebase REST GraphQL Push Notifications

iOS Developer

NonameDigital

Nov 2023 - Jun 2024 (7 months)

Delivered multiple apps with faster release cycles, implemented AR/AI features (ARKit, CoreML), and shortened delivery cycle by 20% via modularization and CI improvements; notable projects improved user satisfaction and detection accuracy.

ARKit Core ML SceneKit AVFAudio CI CD Fastlane Firebase

iOS Developer

D4Group

Jun 2022 - Dec 2023 (1 year 6 months)

Implemented VoIP calling, subscription payments and offline mode for a communication platform, led the largest iOS team in company history to release, increasing recurring revenue by 15% and elderly user engagement by 20%.

VoIP Subscriptions Push Notifications Testing Swift Firebase Payments

iOS Mentor

WebAcademy

Sep 2021 - Nov 2023 (2 years 2 months)

Guided students through group and 1:1 mentoring, provided code reviews, project support and interview preparation, improving delivery speed, code quality, and student job readiness.

Mentoring Code Review Interview Preparation Swift Teaching

iOS Developer / Instructor

ITStolytsa

Nov 2022 - Feb 2023 (3 months)

Taught Swift from beginner to intermediate, created custom course materials and hands-on projects, and improved student outcomes enabling career transitions into iOS developer roles while contributing AR/AI feature development.

Swift AR Curriculum Development Mentoring Unit Testing

iOS Developer

Orcade

Oct 2021 - May 2022 (7 months)

Worked on 3D game features using SceneKit, CoreAnimation and StoreKit, driving a 20% retention increase for Orcade and 15% engagement uplift for Cubes through gameplay and monetization improvements.

SceneKit Core Animation MVVM Firebase Game Development In App Purchases

iOS Developer (Volunteer)

Lyst

May 2020 - Jul 2020 (2 months)

Redesigned UI for an eco-commerce app, increasing adoption by 20% and added donation tracking and eco-product highlighting to improve user engagement.

UI UX iOS Development Firebase Product & Design