Some engineering decisions are easy to change. Others become part of our app’s future.

This talk explores the one-way doors of iOS development. The decisions that are easy to make early on but can be surprisingly difficult to undo later. From architecture and data persistence to API contracts, platform decisions, and app state, these choices can shape how an app evolves for years.

We’ll look at what makes a decision difficult to reverse, why these decisions are often underestimated, and what can happen when they meet a growing codebase, team, and user base.