A company is trying to recruit you, what do you do in order to find if that's a good option without getting into the interview process that may cost you time?
1 - Search the web and make questions. Does the company have a good reputation? How long? How much? If it is a startup, what is the past of the founders?
LinkedIn, Facebook and Twitter.
2 - Talk with friends, what do they know about it?
3 - Do not make too many questions about the startup (if thats the case) until the interview.
What other things do you do?