Revolut interview question

HackerRank LeetCode medium: Longest Consecutive Sequence LeetCode medium: another array/hashmap-style problem SQL query question HR Call Why do you want to join Revolut? General behavioural / motivation questions Technical Interview (1 hour) Coding (≈30 mins) Implement a set without using: hash tables trees built-in set data structure Write test cases for your implementation Software Engineering / Theory (≈30 mins) SOLID principles Decorators Generators Object-Oriented Programming concepts Database transactions Race conditions and concurrency handling Previous Interview Cycle Technical Round 1 Build a simplified URL shortener using a hashmap Write test cases Technical Round 2 Design a class to handle currency transfers between bank accounts Handle precision correctly (decimals vs integer cents) Database concepts Locking mechanisms Explain why your concurrency approach works