difficult take home assignment followed by a techical phone screen. i was told they have several openings from the application team to the infrastructure team and if a team feel i was a fit the team will give me a phone screen. the infrastructure team finally do the phone screen with me, which is weird since i don’t have too much experience on that area. the phone screen includes tons of very low level jvm questions like how does jvm store the objects in memory, how is tree map implemented and how does two threads exchange data. i learned those concept from school, but my daily work is building web platform which never involved such low level knowledges so i never thought they’re going to asking that kind of questions. baiscally i interviewed a position which doesn’t match my background. not sure why that team decide to call me since they should know my background from my resume.