What was the first thing you built in rust at your workplace?

I read TRPL earlier this year and have been a bit slow in implementing this new knowledge and toolchain at work. I've rewritten a lot of my personal Python and Node scripts in Rust, but I'm still unsure of when I'll be ready to use it for projects at my job.

I'm probably not going to start rewriting my backend web stuff just for the heck of it, but I want to start somewhere so I can someday claim X years of professional Rust programming experience.

Where did you start?