It tested highly on system design, understanding of infrastructure, distributed systems, and data structures and algorithms. Make sure to study LeetCode and make sure you know your system design. Thanks so much.

Behavioral questions, asked to tell about how team disagree with me and we handled that. After that coding question: Balanced brackets. Given stream of chars, tell whether it is balanced or not (each opened bracket should be closed). As follow up, asked how to extend code to support other symbols.