Once while applying for jobs I had an interview for a dev job with a firm like this. They refused to tell me exactly what they did, or even the company's name.

Once while applying for jobs I had an interview for a dev job with a firm like this. They refused to tell me exactly what they did, or even the company's name. I had to sign an extensive NDA before I could even interview (it was weird having to sign an NDA when it wasn't clear who I was signing it for)! I was fresh out of school and flubbed the interview, but will never forget the experience. All they told me was, I would work around the clock, but if I came and did my job I would likely make a mint.