We have a few clients that have some backend processes that require a bit more horsepower than Node/JavaScript can provide. We've settled on Rust for those situations due to the active community, the performance, and that so many on the team found the language easy to get used to. To be clear, we do NOT use this for general web development. We use it for long-running, resource-intense processes where we would like it to finish in minutes as opposed to hours.