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Atlassian interviews emphasize pragmatic product engineering: API design, backend data structures, careful clarification, and values-driven collaboration. Senior loops add management-signal and leveling weight, while MLE loops still include substantial backend coding alongside recommendation, RAG, and ML systems design.

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Org Tree Lowest Common Department

Given a company organization tree where internal nodes are departments or groups and leaves are employees, return the lowest department that contains every requested employee. Variants expand from two employees to an arbitrary set, then to employees or orgs with multiple parents and dynamic membership changes.

SWE
MLE
tree
tree-traversal
medium
testing
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