To piggyback on this solid comment, a lot of times it’s us engineers who can fix this. I sat on L5 hiring committee at Google for a while and I really believe what diverse-background candidates need is more support at HC. I could sell these candidates to the committee often, with minimal effort all they needed was a champion at committee. That can be you, dear reader, at many of the big tech companies.

Mostly HC is a ton of work (eg read 8 full interview packets a week) so if you express an interest and are a decent interviewer you’re likely to get shot at it and you can make a real difference.