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Oleg Yakushin

@olegyakushin

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Senior iOS engineer building scalable Swift/SwiftUI apps with clean architecture and quality.

Spain

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What I'm looking for

I want to build reliable iOS products with clean architecture, strong test coverage, and measurable performance improvements. I enjoy mentoring, partnering cross-functionally, and shipping features end-to-end with confidence in security and data correctness.

I’m a Senior iOS Software Engineer with 7+ years of experience building scalable native iOS applications using Swift, SwiftUI, and UIKit. I focus on production-ready architecture, maintainable features, and reliable delivery through strong engineering fundamentals.

I design and implement customer-facing modules end-to-end—from product requirements and architecture through implementation, testing, and App Store delivery. My approach emphasizes clean architecture patterns (MVVM, Coordinator, Dependency Injection, SOLID), testability with XCTest/UI tests, and performance improvements using Instruments and memory/performance profiling.

I collaborate closely with backend, product, design, and QA to align API contracts, edge cases, and release priorities. I’m especially passionate about software quality, mentoring engineers, and building secure, privacy-sensitive experiences with resilient networking and dependable data flows.

Experience

Work history, roles, and key accomplishments

Current

Senior iOS Developer

Current

Independent iOS Development

Jan 2019 - Present (7 years 7 months)

Partnered with startups and product teams to design, develop, and maintain native iOS applications, including NDA-scoped features. Designed reusable iOS SDKs and modular frameworks with stable public APIs, built high-performance native components (including Objective-C/Objective-C++ interop), and supported performance optimization, testing, and CI/CD/release automation.

Swift SwiftUI UIKit Objective C C C++SPM Cocoapods XCTest GitHub Actions Gitlab CI Xcode Cloud

Senior iOS Developer

DetecFit

Jan 2025 - Jan 2026 (1 year)

Owned end-to-end development of customer-facing iOS features, from requirements and architecture through implementation, testing, and App Store delivery. Built SwiftUI/UIKit modules integrating REST APIs and concurrent data flows, and profiled/improved performance and responsiveness.

Swift SwiftUI UIKit MVVM Coordinator REST APIs Async Await Combine Multithreading XCTest CI CD

iOS Developer

Koinly

Jan 2024 - Jan 2025 (1 year)

Developed the iOS app from scratch, including architecture, navigation, and core portfolio/tax-reporting flows. Implemented data-heavy SwiftUI/UIKit screens with secure handling and local persistence, and added XCTest/UI test coverage where required.

Swift SwiftUI UIKit MVVM VIPER Style Separation Coordinator REST APIs Persistence XCTest UI Testing

iOS Developer

Holsom

Jan 2023 - Jan 2024 (1 year)

Built customer-facing features for a lifestyle/conversation app, focusing on engagement, intuitive UX, and maintainability. Implemented reusable modular components, app state handling, backend integrations, and reactive flows using RxSwift/Combine where appropriate.

Swift SwiftUI UIKit RxSwift Combine REST APIs

Supply Chain Analyst

Sherwin-Williams

Jan 2018 - Jan 2022 (4 years)

Performed supply chain analytics and operations-focused work in a large international company. Supported analytical execution and stakeholder communication to solve operations problems.

Supply Chain Analytics Operations Analysis Stakeholder Communication