The jepsen.io server is literally something I hacked together in a few weekends. I wouldn't really point to it as an exemplar of high quality production-facing engineering. :)

That said, it does push 50,000 reqs/sec on my local box, did just fine on an AWS m3.medium, then fell over today at 5 reqs/sec on a heroku "pro" dyno, so... this is something I'll have to address.