You mean for work? Because on my spare time this month I've been working on a RISC-V emulator, an hand-rolled green thread implementation and now a microkernel,

You mean for work? Because on my spare time this month I've been working on a RISC-V emulator, an hand-rolled green thread implementation and now a microkernel, and I'm having the time of my life. I'd take a 50% pay cut to work so close to the hardware in my day job, if there was any demand whatsoever.