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The process moves on fast. Four separate rounds with Zoom. * Coding LeetCode hard * Coding LeetCode hard * System design * Behavior question * What is your most challenging project? * Dive deep following * Reject

A transaction wallet system requires careful design to ensure atomicity and consistency across multiple databases. Here's how to approach it: Use a distributed transaction coordinator (DTC) or a saga pattern to maintain consistency between databases

OA, 2 easy questions. One is for binary tree diameter: calculate the maximum length of a path in a binary tree. It can be solved using DFS. The other is a scheduling problem: find the maximum number of available rooms without conflicting.