TLDR Tech / Data
Re-architecting Affirm's Upfunnel Platform: How We Cut Experiment Cycle Time from Months to Days
Affirm rebuilt its pre-checkout messaging service from a Python monolith into a Kotlin microservice with a rule engine, cutting P99 latency by 50% and reducing experiment setup time from 2 months to 4 days since adding a new experiment means writing a rule against existing attributes instead of engineering a new code path and waiting for deployment.
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