We use (and we love!) Rust at https://snips.ai, you can take a look at a recent optimized neural network library we have open-sourced which uses Rust!

https://medium.com/snips-ai/snips-open-sources-tract-cdc50f4...

We use it for Turtl (https://github.com/turtl/core-rs). I converted a huge portion of the business logic from js -> rust to make it embeddable in a lot of different platforms (by exposing a C api). Very successful, much more stable and fast than its JS ancestor.