Actually, Kotlin does. I know this because I did a startup and chose Kotlin for it a few months before the language hit 1.0 (bold move!). The Kotlin ecosystem

Actually, Kotlin does. I know this because I did a startup and chose Kotlin for it a few months before the language hit 1.0 (bold move!). The Kotlin ecosystem is the Java ecosystem. It runs as fast as Java, partly because Kotlin is basically (90%) a better syntax for Java. It scaled well as the project got bigger. And of course in the beginning nobody knew Kotlin but it didn't hold back hiring at all - you just take Java devs, tell them to read the language guide and they're 90% of the way to being Kotlin devs. Some code review to show them useful little tidbits in the stdlib and you're done. It wasn't a problem. 10/10 would use for a startup again (and will)