There was three rounds of interviews, one phone interview, with generic technical questions, fairly basic. The second 1:1 interview was with two Jr staff go the team, who then proceed to perform a more thorough and in-depth technical interview. The last interview was 1:1 as well, but with 2 Sr members of the staff, which was also a technical interview, but this time around, going through my CV and questioning about systems I've worked on before and drilling me on the design and implementation decisions I've made, according to what I could disclose about my previous work without harming intellectual property. Most questions were around how to increase message throughput, enhance performance of the system and some JVM tuning.