This is not the way to divulge important information so I'm going to have to assume you're a fraud. shrug
First, there's a WSJ article out now with some more details that appears to back him up[0]:
> Investigators believe that the SolarWinds hackers gained access to a TeamCity server used by SolarWinds to build its software products, but it is unclear how this system was accessed, according to people familiar with the matter.
Further, some rudimentary OSINT reserach indicates he is, in fact, a JetBrains employee. People can do their own sleuthing if they're inclined to verify this; I have no desire to dox the guy publicly.
[0]: https://www.wsj.com/articles/solarwinds-hack-breached-justic...