I'm employed on the Compilers team at Igalia. Igalia is a consultancy well known in a number of open source software communities, including Gnome, WebKit, Chromium (and v8), Rust, Servo, LLVM, the Linux kernel, and many others.
I first became interested in work on compilers during my teens, reading textbooks relating to deterministic finite state machines as they pertain to parsers and regular expressions, and about the building blocks of a compiler. I would read GCC source code, and try to figure out how it all worked, putting together some toy compilers. Eventually, I applied this knowledge to creating some simple domain-specific scripting tools to assist with work at an earlier employer.
Some notable things I've worked on (not an exhaustive list, and links to upstream patches are only small portions of the work that I've put into those features!):