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I have a few personal and professional Swift on server projects, in the wild and in the works. Code reuse is a big win – we can ~easily expose functionality of our client apps to other systems. Familiarity is another – there's an ocean of iOS (and, to a lesser extent, macOS) developers out there who are familiar with Swift. With a little bit of coaching, they can pretty quickly get up to speed with how services work.

It reminds me a lot of what it was like to ship Node.js software 15 years ago – the ecosystem is still young, but there are enough resources out there to solve 95% of the problems you'll face.