AI & Technical question

Replit wants optimization based on trustworthy conversion signals, not noisy platform defaults. Define the event taxonomy, identity and attribution approach, and client-side/server-side instrumentation you’d require from signup through retained activation. How would you handle latency, deduplication, audience exclusions, and warehouse reconciliation so bidding systems can optimize in near real time?

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What this question tests

Tests technical instrumentation design for trustworthy conversion signal that ad platforms can optimize against in near real time.

Define an event taxonomy anchored on true conversion milestones, signup, first project run, and retained activation at a set day threshold, not vanity events.
Design identity resolution that stitches anonymous ad click through to authenticated user, using a durable identifier that survives across sessions and devices where possible.
Combine client side events for fast signal with server side events for accuracy and resilience to ad blockers, sending both to the ad platforms.
Handle latency by sending early proxy events, like signup, quickly while backfilling the platform with the stronger retained activation signal once available.
Deduplicate events between client and server pipelines using a shared event ID, and apply audience exclusions to suppress users who already converted from further spend.
Reconcile warehouse truth against what was sent to ad platforms on a regular cadence, catching drift before it silently corrupts bidding decisions.

Separates fast proxy signals from the true retained activation signal explicitly, and describes backfilling the platform once the stronger signal is available.
Combines client and server side tracking deliberately for resilience, rather than relying on one method alone which is vulnerable to blockers or SDK issues.
Includes a concrete reconciliation step against the warehouse, which is what actually catches instrumentation drift before it corrupts bidding decisions.

Optimizing bidding systems against a single early funnel event without ever correcting toward the true retained activation signal.
Skipping deduplication between client and server events, which would inflate conversion counts and mislead the bidding algorithm.

How would you handle a user who converts on one device but was acquired on another?
What would you do if server side event volume and warehouse counts start diverging?