Hi, I'm Karolina,
Lead iOS Engineer at Lake.
I write about building iOS apps, the iPhone Duo and working with AI coding agents. I also made duoctl, an open source tool for testing apps on the iPhone Duo simulator.
More about me on the Experience page. Featured in SwiftLee Weekly and iOS Dev Weekly.
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The simulator is crackling again: what changed with Device Hub and how to fix it
04 Nov 2026
Routing simulator audio to BlackHole used to stop the crackling for good. With Device Hub the setting is per simulator, so every new one plays through your speakers again. Here is where the setting went and how to make it stick. -
Where did my disk go? Xcode, worktrees and AI agents
12 Oct 2026
Running AI agents on an iOS project in parallel worktrees quietly eats disk space, and when the disk fills up, Xcode reports everything except a full disk. Here's where the space goes, how to measure it honestly and how to keep it under control.