We used Figma for all the UI design and also for sharing details (colors, spacing etc.). I really like the desktop feel of the web UI -- I believe this really makes it stand out vs. other web-based design tools. Still like Sketch better for marketing stuff (social media posts, cheat sheets,...), but Figma is clearly on top if we are talking about UI work.
Already worked with a lot of programming languages (C, C++, ObjectiveC, Java, JavaScript), but Swift is definitely one of the best (if not THE best). The only small downside is that generics are really extremely "typed", but even this improved a lot over the last few years. The best things about Swift: safe optionals, good error handling and Swift concurrency.
We built Firetask 5 from the ground up using SwiftUI. A few things are still a little bit unnecessary complex (especially advanced window handling on macOS), but overall SwiftUI is a great UI framework and we really like its flexibility and how fast you can prototype new views with it.
Firetask 5
