I applied to Datometry after seeing their job announcement on the DBWorld mailing list. I liked the fact that their product solves a difficult problem - migrating the backend database without changing user code. There was an initial phone interview, followed by one hour take-home coding exercise. We moved quickly to the onsite round. The questions asked at Datometry gradually increased in difficulty as they added cases like memory limits, string encoding schemes, etc. A short presentation is expected from PhD candidates. Overall, every one I met was genuinely nice and smart.