I interviewed there. It was extremely challenging, but somehow I passed it. I had a very positive impression of the company and its culture. Recruiters and interviewers were super-responsive.
It was in the early days, so it was a very startup-y attitude, "we're so smart" sort of thing. The engineers were smart, from Stanford and CMU, so it was partially justified. I ended up not taking the offer. Not for a particularly good reason, it just didn't fit with life circumstances.
Looking back, it would have been a bad idea. I didn't understand the product, which is pretty essential when joining a company. The stock was granted as options, so without an IPO it is illiquid. The salaries were all low, but at the time someone could have lived in Palo Alto on them.
It turns out they thought they could tackle this problem of disparate data silos and change the world while respecting privacy. They weren't able to automate away the expensive process of having Forward Deployed Engineers do data integration work.