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Architecting multi-touch attribution

Source: interviewintermediate

WHAT IT TESTS: Identity stitching and credit assignment. OUTLINE: Ingest touchpoints, resolve to one identity, order into paths, apply a model; last-touch is trivial, time-decay needs the full path. RED FLAG: Ignoring cross-device identity.

WHAT IT TESTS: Whether you can build the plumbing and modeling for attribution. ANSWER OUTLINE: Pipeline: collect touchpoints per channel, resolve them to one user via identity stitching, order them into a path with timestamps, then apply a model. Last-touch needs only the final pre-conversion touch, so it is simple but discards assists. Time-decay must keep the whole ordered path and weight by recency, which is heavier to compute and tune. RED FLAG: Treating channels as independent or skipping cross-device identity resolution.

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Architecting multi-touch attribution · Tezvyn