Nim is the original language we use. Zahary is a prolific contributor to Nim, and we have a good relationship with the Nim community, they've helped a lot!
Nim and some Python are used for our closed source rr backend currently, and the frontend is written in Nim (compiling to JavaScript).
The backend for blockchain and scripting language which is open sourced, is newer and we used Rust there for several reasons. One of them is related to the fact that many blockchain languages are implemented in Rust and this makes it easier to interoperate/contribute. There are other aspects as well: both languages have pros and cons.
Some pros of Nim are e.g. it's metaprogramming support; the ability to share easily code/types between backend and frontend(it's an alternative to both e.g. C++/Go and TypeScript for us).
Nim and some Python are used for our closed source rr backend currently, and the frontend is written in Nim (compiling to JavaScript).
The backend for blockchain and scripting language which is open sourced, is newer and we used Rust there for several reasons. One of them is related to the fact that many blockchain languages are implemented in Rust and this makes it easier to interoperate/contribute. There are other aspects as well: both languages have pros and cons.
Some pros of Nim are e.g. it's metaprogramming support; the ability to share easily code/types between backend and frontend(it's an alternative to both e.g. C++/Go and TypeScript for us).
We're thankful to both language communities!