How and when do you secure data (login credentials) for phone / internet App in a Multi-tier Application. LRU cache implementation in Java. How can you find median of million numbers using multiple nodes - basically Merge Sort algorithm - How HashMap works internally in Java. Design database table/tables to store family tree and relations. A service depends on 2 sets of data from 2 different databases, but 1 database is lagging few seconds. Solve the use case. Explain one challenging task in you last project and how did you solve it.
