Day 171: Conversion Funnel Analysis from Application Logs
Agenda
Today’s lesson covers one complete build, from raw log lines to a live funnel dashboard:
Why funnel analytics lives inside your log pipeline — not in a separate SDK
How distributed log events get sequenced into per-session funnel steps
The state machine that tracks session progression and computes drop-off
Component architecture: parser → state store → aggregator → API → dashboard
Building and running the full system with 18 automated tests
Verifying the funnel output and exploring the live React dashboard
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Why Conversion Funnels Live in Your Log Pipeline
Every product team at Stripe, Shopify, or Airbnb has a conversion funnel dashboard. What most engineers don’t realize: that dashboard isn’t fed by a separate analytics SDK — it’s computed directly from the same application logs your distributed system already emits.
When a user lands, views a product, adds to cart, and checks out, each action writes a log line. Your job as a systems engineer is to stitch those scattered lines — arriving from multiple servers, out of order, over minutes — into a coherent per-user journey, then aggregate millions of journeys into a single funnel shape.
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Are you preparing for Cracking FAANG interviews ? Here is full Preparation kit: 52 FAANG System Design Interview Questions
