Blog — Rajmani Kushwaha

ios swift concurrency actor-isolation swift6

Actor Isolation in Swift 6 — @preconcurrency Is Not a Migration Strategy

Most Swift 6 migration guides focus on fixing compiler errors. This one is about the bugs that compile cleanly, pass CI, and still break your app in production.

May 1, 2026 · 17 min read Read →

ios swift concurrency sendable swift6

Sendable Migration in a Large Codebase: Mental Models That Actually Help

Sendable migration in a real production iOS codebase isn't a checklist — it's a cascade. Here are the mental models that helped me move faster and make fewer mistakes.

April 26, 2026 · 20 min read Read →

ios swiftui performance rendering equatable

From State to Screen: A Practical Mental Model of SwiftUI's Rendering Pipeline

Most SwiftUI developers know that 'state drives UI.' What they don't know is everything that happens between those two things. I didn't either — until I started asking the right questions.

April 21, 2026 · 24 min read Read →