Citi Analyst interview questions

I did an online test and passed, they then followed up and told me they would contact me to arrange an interview. Three weeks later I received a rejection email with no explanation. No further interview was ever offered.

Some what extensive. interviewer used to go in-depth of concept. how to used the concept. where to used. what would be approach to tackle the problems. Also they have asked on debugging approach. In framework they used to asked concept and process design as well. Design pattern questions. Build tool like ant, maven.