2 calls + On-site. Calls were basic, centered around key components of your resume. Stick to 1-2 key innovative/ disruptive things u'v turned around in terms of product or decision etc. On-site is a 7 hour session. Its pretty conversational, so try connecting with each of the interviewers (likewise with the calls). Use the STAR approach, as the interviewers are busy on their computers taking down notes on what u'v said etc, so make it easy for them to jot stuff down. They will follow up with cross questions, so be prepared, but be brief.