About

I’m Juraj Macák, a senior iOS engineer in Nové Zámky, Slovakia. First Swift I shipped went out in 2017, from an office in Žilina. Nine years later there are apps with my code in them that people complain about publicly when they break, which is a fast and unsentimental way to learn.

What I actually do

Native iOS: Swift 6, SwiftUI, UIKit where it still earns its keep, structured concurrency. Kotlin Multiplatform when the business logic actually is shared. Often it isn’t, and somebody upstream only wishes it were.

Architecture is the part I care about. Clean Architecture, dependency injection, modularisation, none of it as a badge on a CV. I’ve inherited codebases where nobody drew a line early, and two years later a “small” change touched forty files. I’ve run the MVC to MVVM migration on production apps twice. Nobody claps for that work.

The odd one out on my list is an identity library: reading a national ID card over BLE, against ISO 18013. Months of a standards document open on one screen and a Bluetooth trace on the other. I’d take that job again.

I mentor too. Juniors and mid-levels, code review, onboarding standards for teams that had none. Of everything on this page, that’s the part with the longest half-life.

AI, without the pitch

Agents are in my day now. Code generation, UI prototyping, spec-first work. I like the tools and I believe almost nothing that gets written about them, which is why Receipts exists: hours, money, and the parts I had to redo by hand.

The rest

Slovak natively. English professionally. German badly, but improving.

Master’s in Management, Science and Informatics from the University of Žilina. Agile & Scrum Fundamentals from ScrumDesk, May 2025 — a good course, and it mostly confirmed that the process was never the hard part.