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Typically, candidates receive a case/problem statement about a week in advance. Candidates are expected to prepare a response, often in the form of a presentation or document. The actual jam session usually involves 2-3 interviewers from the team.
The focus is less about arriving at the “perfect” answer and more about:
The framework and structure used to approach the problem
Depth of thinking
Consideration of edge cases and operational realities
Product judgment and prioritization
Ability to incorporate feedback live during discussion
Collaboration style and communication
Whether the person seems easy to work with