We are working on a product written in Scheme. It's mostly just me currently. Not (currently) using Racket, but a set of libraries[1] on Gambit-C, as well as an interpreter written in C++[2]. We might take someone on board a few months from now (London/UK).
[1] https://github.com/pflanze/chj-schemelib [2] https://news.ycombinator.com/item?id=18045890