Hannes Dermutz

Senior iOS Engineer

Thoughts on Swift, iOS architecture, product engineering, developer experience, and building polished software.

Common Pitfalls and Issues When Sharing and Collaborating with CloudKit and Core Data: Part 1

September 16, 2026 CloudKitCore DataiOSSwift

Hardening CloudKit and Core Data sharing in production: understanding the sharing lifecycle, avoiding un-sharing data loss, and handling cross-store relationships.

Why I Am Still Using MVVM in SwiftUI

June 12, 2026 SwiftUIMVVMArchitectureiOS

MVVM is not mandatory in SwiftUI, but it is still one of the most useful ways to keep real apps understandable, testable, and resilient.