Complete mess. Poor communication between early stage interviews. After second round interview, received a phone call indicating they'd be passing and moving on other candidates, after which I was offered the position. After offer letter signed, 2 days before start date, I was contacted by SiteRX and informed they were rescinding the offer. Apparently they failed to obtain Series B funding and were chopping heads / rescinding other offers as well. Total waste of time. In retrospect, a bullet dodged. Unstable start-up company. Avoid at all costs.