Open to opportunities

Oleg Voitin

@olegvoitin

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Senior iOS engineer focused on scalable architectures, performance optimization, and feature delivery across teams.

Germany

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What I'm looking for

I’m looking for a senior iOS role where I can lead architecture and performance work, drive scalable feature delivery with cross-functional teams, and keep improving engineering quality—using modern Swift tooling and smart automation.

I’m a Senior iOS Engineer with 8+ years specializing in system architecture, performance optimization, and scalable feature delivery. At CHECK24, I led end-to-end refactoring of a large multi-module application, modernized architecture, and migrated legacy UI from UIKit to SwiftUI while transitioning to MVVM—improving scalability, maintainability, and app performance.

I also lead technical roadmaps and architectural decisions across teams, partnering with product and stakeholders to align solutions with business goals. I’ve delivered high-impact features including AI-powered initiatives with LLM integration, and I’ve used CI/CD tools like GitLab CI, Bitbucket, and Jenkins to support efficient release processes; earlier roles included leading iOS teams, migrating from RxSwift to Combine, and shipping real-time WebRTC communication.

Experience

Work history, roles, and key accomplishments

Current

Senior iOS Engineer

Current

CHECK24 Vergleichsportal GmbH

Nov 2022 - Present (3 years 9 months)

Owned delivery and scaling of a high-traffic iOS app for SIM plan comparison, using A/B testing and analytics to improve feature performance. Led a full application refactoring, migrating UI from UIKit to SwiftUI and transitioning to MVVM to improve scalability and performance.

A B Testing Analytics iOS App Scaling Refactoring System Architecture UIKit SwiftUI MVVM Dependency Management Performance Optimization

Team Lead iOS

SberHealth

Dec 2021 - Nov 2022 (11 months)

Led an iOS team of 5+ engineers building a medical app, ensuring consistent, high-quality feature delivery. Defined system architecture and technical roadmaps, leveraging CareKit and HealthKit, and supported team growth through hiring, onboarding, and mentoring.

Team Leadership Architecture HealthKit Agile Scrum Hiring Onboarding Mentorship Code Review

Senior iOS Engineer

SberHealth

Jun 2020 - Dec 2021 (1 year 6 months)

Led migration from RxSwift to Combine across core modules to improve runtime performance and reduce memory usage. Optimized critical user flows to reduce screen load times and UI bottlenecks, and introduced retrospectives and continuous improvement practices to increase productivity (~30%).

RxSwift Combine Performance Optimization Memory Management Screen Load Time Optimization UI Bottleneck Elimination Continuous Improvement

Team Lead iOS

Blogman (now Compass)

Jun 2019 - Jun 2020 (1 year)

Led development of real-time in-app calling functionality using WebRTC, delivering low-latency communication under varying network conditions. Designed and implemented scalable architecture for real-time communication and scaled the iOS team and workflows to improve delivery efficiency.

WebRTC Real Time Communications Low Latency Systems System Architecture Scalability Scaling Teams Process Improvement

iOS Engineer

Blogman (now Compass)

Dec 2018 - Jun 2019 (6 months)

Developed and delivered core features for a messaging application, contributing to product stability and user engagement. Performed systematic refactoring across multiple modules and conducted thorough pull request reviews to enforce code quality standards.

Refactoring Code Quality Pull Requests Coding Standards