I applied online through an employee referral. The process was long and strenuous. The first steps involve taking a mechanical aptitude test, then a pre-recorded interview, a personality test, and finally they fly you out to their HQ in Chicago for a career day. Everything before the career day is not too difficult, but the career day itself can be a bit more intimidating. It consisted of a case study, product demo, sales role play, and final interview. They do their due diligence to make sure you are a match for their company but you have to stick with it. When I did my product demo (which is doing a demo for one of their products) I did it with the COO of the company, which was a bit intimidating. What is important is you try your best and that is the best way to know whether or not you are a fit.