I got an email from a potential employer on Saturday asking me to coming for an interview the following week. It was sent to me around 13:00 in the afternoon. Seems like something that could have waited til Monday.
The company from what I can research is pretty small, only started in 2012. they have 9 employees on Linkedin kind of small (more red flags) . In fact, it was the President that emailed me for an interview (also a red flag). I'm pretty averse to start-ups or companies that a too small.