For anyone interested, these days there are multiple people working on impressive stuff, sometimes it's even open source:

https://www.youtube.com/@GabeRundlett (open source engine in C++ with e.g. Rust bindings via C)

https://www.youtube.com/@DouglasDwyer (proprietary, using Rust and WGPU but interesting videos)

https://www.youtube.com/@xima1 (afaik proprietary, using WebGPU and typescript)

Open source stuff:

https://github.com/ria8651/alex (Rust) https://github.com/davids91/shocovox (Rust)

There is a myriad more, many discords...