Earlier quoted context omitted.
If you can't setup an IRC or XMPP server, then I don't think you should call yourself a software engineer. If you're a scrappy startup, you sure as hell better be able to setup an IRC server. And no... it doesn't take more than an hour to spin up an EC2 instance and setup inspircd as a private server.
If you're a scrappy startup, you better not have engineers wasting time setting up servers when there are great hosted products out there.
apt-get install ejabberd
5 minutes of conf file tweaking and you're done. Seriously that's it! I did this about 8 years ago and haven't touched my setup since. There's pretty much zero maintenance to do with an XMPP server.