Naughty Dog is (big) one that comes to mind immediately. Check out their GDC talks. GDC in general is a good place to find in depth technical talks from devs.

FromSoftware (Dark Souls/Sekiro) Polyphony Digital (Gran Turismo) Santa Monica Studio (God of War) Kojima Productions (Death Stranding) Larian Studios (Divinity Original Sin) Playdead (Inside/Limbo)

Studios who choose/have the freedom to release a game "when it's ready", and/or have Sony/Microsoft backing.

One can hope Microsoft's acquisition of Bethesda will change their ways, but having set the release date of Starfield (11/11/22) so far ahead of time doesn't inspire confidence... hopefully they'll have the freedom to push this back if needed.

From the people I've talked to, Epic Games and Riot developers seem to have their shit together as far as being able to scale their backends to millions of players. Improbable too (although they're more of a game services studio), who are the creators of Thanos*

* https://www.improbable.io/blog/thanos-prometheus-at-scale)

id Software is the one that comes to mind. Even with the Zenimax acquisition and Carmack's departure, they don't seem to have lost their engineering chops. Doom 4 and Doom Eternal are known to run incredibly well.

id

Epic

Valve

Guerilla Games

(IMO)