Event-Driven Signup Flow with Redpanda and Python

This technical tutorial demonstrates how to build an event-driven user signup flow using Redpanda Cloud and Python. The guide shows how to publish user lifecycle events (SIGNUP, UPDATE, DELETE) to a Redpanda topic from a CLI-based producer (using kafka-python), how a consumer replays those events into a SQLite read-model, and how a separate query script reads state directly from SQLite without touching the broker. The tutorial highlights design choices such as keying messages by user_id to preserve per-user ordering, using acks='all' for durability, manual consumer offset commits for at-least-once delivery, and idempotent writes (INSERT OR REPLACE) to make redelivery safe. It emphasizes the separation of write (events) and read (materialized view) paths and the ease of adding independent downstream consumers.