I was interviewing for a role in London. The interview had four rounds.

• The first round was a code review where we went through different code sections and I had to point out the bugs. There were some tricky bugs around multithreading.
• The second round was data structures, which was simple.
• The third round was system design, which was also simple.
• The behavioral round consisted of situation-related questions.

Design an ATM-related service.

Data structure was a hash map-related question.