Sessionize a support-event stream: a gap over 30 minutes starts a new session; dedupe events
Sessionization is the analytics primitive behind every 'how do users actually behave' question, and a favorite practical screen. The algorithm is easy; out-of-order events and duplicates are where the round is actually scored.
Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.
Sessionization is the analytics primitive behind every 'how do users actually behave' question, and a favorite practical screen. The algorithm is easy; out-of-order events and duplicates are where the round is actually scored.
Lead with where the obvious approach breaks, because that is the judgment they are screening for — most candidates jump straight to the happy path and lose the room.
Then walk the failure back through the pipeline in order, naming the one metric the customer's exec sponsor actually cares about before you propose the fix.