I got recommended by someone already working in the company. In the interview I admitted that I had not heard about the software I was supposed to work with, but was sure I could deal with it.
I dealt with it successfully, and will have my 30th anniversary working in that company in a few weeks.
Especially given how bad the US is with regards to keep backdoors and their keys secret. Just look at what state hackers did with American telco equipment recently.