Phone interview. The people there did not seem very knowledgeable about overall security best practices but were well versed in specific points of security. Beware of sounding too intelligent or overly knowledgeable of the subject. You may cause people to feel threatened. I believe that HR chooses candidates based on the values expounded by the founder Ray Dalio to try and find the best and the brightest but in the Ultra Transparency environment this could cause some hiring managers to feel threatened by potential candidates.