This site isn’t very well known, even to Rust people. Here’s an open Rust job right now: https://facebook.com/careers/jobs/a0I1H00000LCTYYUA5/
There’s even a Rust job open on the front page of HN right now: https://news.ycombinator.com/item?id=16767515 (specifically this one https://onesignal.com/careers#senior_backend)