Malmö, Sweden

Vitalii Sydorskyi

Software Engineer in QA at Apple. About ten years of building iOS apps, often where software meets hardware: Bluetooth positioning, point‑of‑sale payments, receipt printers. Here I write about Swift as I learn it.

Work and contact

Writing

Series Swift concurrency for GCD hands A short course for iOS developers who learned concurrency on Grand Central Dispatch. Each chapter starts from the way you would do it with GCD and then shows what Swift concurrency actually does. I’m making the same move myself and write the chapters as I go. 2 of 2 chapters · 28 min Contents

Actors for GCD hands: isolation, reentrancy and the main actor Swift Ch. 2 27 Oct 2026 What replaces the serial queue, why an actor lets other calls in while it waits, and what @MainActor gives you that main.async never did.
async/await for GCD hands: suspension, tasks and the pool you must not block Swift Ch. 1 27 Oct 2026 What happens at an await, who runs an async function, and why a semaphore that was harmless under GCD can hang a Swift concurrency app.
Wrapping iOS apps with the Intune App Wrapping Tool: a practical guide iOS 13 Nov 2025 How to wrap an iOS app for Intune without touching its code: prerequisites, signing, MSAL settings, which app protection policies a wrapped app supports, and the three failures that cost me the most time.

All posts