Stop in for a cup of coffee

And how does that make it legit? Either you are 'God's gift', they are desperate, or its a scam. Just seems WAY too fast of a reply. Normal hiring scenario is more like collect apps for a week, reply to top candidates, interviews phone then in person...
Because I have something that's tough to get and less than 1 percent of the population have. Combined with the CAD stuff they need and that number drops even more. Think DoD contractor. I lean towards them being desperate to be honest.