Nest Engineering Program Manager interview questions

My experience was a pretty long one... I got referred through a friend who knew a design / technical recruiter. After emailing my resume etc. my initial recruiter made contact straight away. I got put forward for a specific role, and had multiple phone interviews (1st screening, hiring manager, senior executive). My initial recruiter then left Nest, and I was assigned another one. It was then suggested I go for an EPM role, to which I had more phone interviews (1st screening, hiring manager). I got asked to come on-site for a full interview.... 5 hours was allocated and I spoke to 4 different people on the team back to back. It was a pretty intense experience - lots of questions! I haven't received a final decision after on-site interview - I'm assuming it's a 'no'.

The initial contact and interview were generally positive. The phone screen was a good discussion and the process was relatively quick to set up the on-site interview. However, I never heard anything at all after the interview, which leaves me with a negative impression of the recruiter, the process and company overall. I'm sure Nest has no shortage of candidates; at the same time, I have interviewed enough candidates at my current company to know that it's just a good practice to treat people with respect, even if the decision is ultimately that someone is not a fit. That same candidate may ultimately be a customer, and a negative impression of the company may impact someone's decision on whether to buy or recommend the company's products, or even whether to refer other qualified candidates for the role. The recruiter also reacted very strangely to several of my questions during our initial conversation. All in all, not sure what it's like to work there, but I'd be concerned based on my experience of the interview. With regard to the interview itself, I don't remember any questions that were particularly difficult. Several people asked questions indicating that the development process is really more waterfall than Agile.