First Stage: A phone screen with a recruiter, basic screening questions about my background, experience etc. Positive outcome. Second Stage: A joint phone call with a team leader and the same recruiter. Positive outcome. 'We will contact you via email around XXXXX date about scheduling an on-site final interview! Looking forward to meeting in person!' etc. Didn't hear from them around the date, checked in a week afterward, no response. Waited even more, checked in a final time, no response. Conclusion: Extremely unprofessional end to an otherwise pleasant and satisfactory interviewing experience. There really is no reason to NOT send a note or otherwise indicate you intend to cancel / go back on an offer to a final interview for a role.

Phone screening, in person technical interview nothing intense mostly conversational with a bit of white boarding but nothing stressful. Then I received one more phone call extending offer and all negotiations took place over the phone with CFO.