I've worked on all the levels of the Linux graphics stack, from the kernel to the X Server to OpenGL and Vulkan implementations, up to WebGL in Firefox.
In 2019-2024 I worked for Google on the graphics drivers for Chrome OS, including the reverse-engineered Qualcomm driver.
Prior to that I was at Broadcom working on Raspberry Pi's graphics driver. In the process I stumbled into becoming the Linux kernel maintainer for the platform and turned into an expert on ARM SOCs. This was not my plan, but it was a fun ride.