CoreWeave·Software Engineer·Onsite - System Design / Architecture
- Design an object-oriented tree class that supports DFS and BFS traversal. Walk through the node model, the traversal APIs, and how you'd test it.
- How would you serialize and deserialize the tree?
- How would you find the lowest common ancestor in this tree?
- How would you handle deep recursion without hitting stack limits?
- How would you handle concurrent mutations to the tree during traversal?
“I started with a generic n-ary node and defined traversal methods that return values, but the interviewer kept poking at my API design.”