Open to opportunities

Oleksandr Slobodianiuk

@oleksandrslobodianiu

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Senior iOS engineer delivering resilient, high-scale SDKs that improve performance, stability, and time-to-market.

Portugal

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What I'm looking for

I’m looking for B2B/contract opportunities where I can lead resilient iOS architecture and SDK development, improve performance and stability, ship at global scale, and mentor teams to measurable time-to-market and quality outcomes.

I’m a Senior iOS Engineer with 10+ years of experience specializing in high-scale systems (200M+ active users) and resilient SDK architectures. I’m known for autonomous delivery and for aligning technical decisions with core business metrics like time-to-market and performance optimization. I also have a strong people track record, growing 100+ engineers from zero to production-ready.

At Grid Dynamics, I led core mobile engineering and architecture design for global enterprise clients, prioritizing system stability and scalable delivery. I redesigned data synchronization for Lufthansa’s in-flight connectivity, cutting average content load time by 3x on high-latency networks while maintaining uninterrupted UX; for Mars, I optimized an SDK used across 2000+ applications, improving loading speed by 20x and reducing memory consumption by 10x. I also directed international team onboarding at Wolters Kluwer and helped achieve and maintain a 4.9 average App Store rating.

Previously, at GlobalLogic I delivered high-performance mobile solutions and microservices for media and entertainment clients, including engineering iOS/tvOS streaming features at AMC with a 100% crash-free rate within the core Search microservice. I’ve also led end-to-end iOS platform development for a real estate service and built modular MVP architecture for private aviation, including mentoring to improve engineering velocity. Beyond engineering, I’ve served as a Lead iOS Instructor and Engineering Lead/Technical Instructor—designed curricula, guided teams, and graduated 100+ and 128 students through Web Academy and SkyLab, respectively.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer (iOS)

Current

Grid Dynamics

Dec 2021 - Present (4 years 7 months)

Led core iOS mobile engineering and architecture design for global enterprise clients, focusing on stability, performance optimization, and scalable delivery. Delivered results including a 3x reduction in in-flight connectivity load times and large-scale SDK performance improvements across 200M+ users.

Clean Swift SwiftUI UITests Firebase RxSwift Repositories SDK GRDB IOS Architectures Performance Optimization

Lead iOS Instructor

Web Academy

Jun 2021 - Jan 2024 (2 years 7 months)

Designed and delivered a comprehensive iOS software engineering curriculum, mentoring and graduating 100+ engineers. Provided ongoing technical instruction through the program for Ukraine’s IT tutoring center.

Instructional Leadership Mentoring Technical Education

Engineering Lead & Technical Instructor

SkyLab (EdTech Platform)

Jun 2022 - Sep 2023 (1 year 3 months)

Led engineering and technical direction for a community-driven iOS educational platform with a team of 20+ volunteer developers. Architected the learning platform and served as lead technical instructor, graduating 128 students.

Engineering Leadership Technical Instruction IOS Education Platform Architecture

Senior Software Engineer

GlobalLogic

Dec 2019 - Dec 2021 (2 years)

Delivered high-performance mobile solutions and microservices with a focus on architectural scalability and user experience. Worked on iOS/tvOS video streaming and implemented a network-bound resource approach that reduced boilerplate by 50% and decreased user-reported issues by 70%.

Swift UIKit GraphQL REST Firebase Fastlane Keychain Realm SQLite Microservices

Software Engineer

LUN

May 2018 - Feb 2019 (9 months)

Designed and drove end-to-end development of the iOS platform, scaling it across multiple markets within 9 months. Improved user engagement by boosting average session duration by 2.5x through feature implementation and architectural optimizations.

UIKit Google Maps Mapbox Analytics Realm CI CD

Software Engineer, Product Owner

Awery Aviation Software

May 2017 - Apr 2018 (11 months)

Designed a modular iOS architecture for a private aviation service and delivered a stable MVP in 2 months. Reduced new feature development time by 50% through scalable codebase patterns and mentoring junior engineers.

Objective C VIPER Predicates OAuth Mentorship CI CD IOS Architectures

Software Engineer, Scrum Master

8WIZARDS

Jun 2016 - May 2017 (11 months)

Maintained and enhanced legacy Objective-C applications while establishing CI pipelines and applying test-driven development practices to streamline delivery. Supported continuous delivery workflows and quality practices for iPad/iOS applications.