Yuri Artyukh, mostly threejs, webgl stuff https://www.youtube.com/channel/UCDo7RTzizoOdPjY8A-xDR7g , although I'm not experienced enough to judge if its actually intermediate.

Jon Gjengset, Rust (internals, data structure, protocol impls) https://www.youtube.com/channel/UC_iD0xppBwwsrM9DegC5cQQ

aarthifical, not really live-coding but a game devlog with interesting ideas https://www.youtube.com/channel/UCtEwVJZABCd0tels2KIpKGQ