Most of this has to do with variable factors. Age being a huge one. If you're young the border patrols fear you coming and staying (this is true for most countries). If you're older (25+) you get asked reason for visit, duration and where you're going. After that I haven't had much more at an airport. At a ground grossing I've had much worse.

Return ticket and access to money would probably the next questions if they want to go further.

I wouldn't get too worked up about it. Having a business card should do for proving employment. Let them waste their time (and yours) calling your employer if they decide you're suspicious.