[kyrra]

Google uses it internally for incident management.

https://landing.google.com/sre/sre-book/chapters/managing-in...

It's a lightweight server and client that can stay up even when most of Googles core tech is down. You can easily log data from channels, and it just works.

[goosehonk]

Googlers also use it for the daily chat, not just incident response.

[chaosite]

Very specific Googlers, mostly SREs, use IRC.

[goosehonk]

After I switched from SRE-SWE to just SWE, my team (of six SWEs) used IRC and it wasn't because of my influence, either.

[nv-vn]

In my experience most SWE teams just use the hangouts chat nowadays