Nim. Fantastic choice for modern headless software. Simple obvious type system, preference for immutability and referential transparency. Dynamic collections are by default managed by hidden unique pointers on the stack. So the default RC isn't necessary unless explicitly invoked for a ref type.

Currently solo managing a 30k line data analysis application I built for my company. Easily fits in my head given the obvious pyramidal functional-like structure. Maybe two lines of memory semantics anywhere in the entire thing, and only one module that's OO with a constrained scope. Lots of static data files (style sheets, fonts) slurped up as const strings at compile time. Incredible performance. Invoked by our PHP server backend, so instead of doing parallel or async in the analysis, the server gets that through batch invocation.

Working stupid well for our product, plus I can easily compile binaries that run on ARM and RISC-V chips for our embedded team just by invoking the proper gcc backend.

Replaced an ailing and deliberately obfuscated 20 year old jumble of C and PHP designed to extort an IP settlement from my company. Did it in a year.