Suggestions for first contribution?

Hi guys,

Can anyone suggest a project for my first PG contribution?

My first two ideas didn't pan out:  Yury doesn't seem to need help
with CMake, and the TODO list's "-Wcast-align" project (now deleted)
appeared impractical.

I can continue trying things from the TODO list, but if someone knows
of a project that's definitely worth doing, all the better.

I'd prefer doing back-end coding, but I'm flexible.  The only two
caveats are: (1) I can't work on speedup-focused changes without my
employer's permission, and (2) I only have access to Linux boxes.

Any advice would be greatly appreciated.

Kind regards,
Christian