I've met two of their devs randomly in different Discord servers. Both were great people (Noah, Olaf) and are very active in OSS communities. Perhaps not coincidentally, both worked on Language Server related stuff.
Ólafur is responsible for a lot of Scala tooling and some pretty neat original ideas.
Sourcegraph also came up with LSIF, which is useful format for building tooling for language servers:
Sourcegraph CEO here. I'm really sorry about that. We work really hard on making our interviews good for everyone, including documenting it publicly at https://handbook.sourcegraph.com/talent/interview_process. Could you please email me at sqs@sourcegraph.com so I could find out what happened?
I interviewed for Sourcegraph and it was one of the best. Super transparent process, open source handbook, fun coding tasks -- really nothing to complaint about. Would be curious to know what made you have such a different experience.
Ólafur is responsible for a lot of Scala tooling and some pretty neat original ideas.
Sourcegraph also came up with LSIF, which is useful format for building tooling for language servers:
https://lsif.dev
If you want to build this sort of stuff, the work Sourcegraph has done with LSIF + SemanticDB is probably your easiest bet.
N=2 isn't great, but there's my experiences if we're tossing them out there.