Event-Driven Architecture

Concepts covered: paEventDriven

What They Want to Hear 'In event-driven architecture, services communicate by publishing events instead of calling each other directly. When an order is placed, the order service publishes an event. The inventory service, the notification service, and the analytics pipeline each consume that event independently. No service needs to know about the others. This decouples teams and systems.' That is the answer. Publish, not call. Independent consumers. Decoupled teams.

About This Interactive Section

This section is part of the Streaming Systems: Beginner lesson on DataDriven, a free data engineering interview prep platform. Each section includes explanations, worked examples, and hands-on code challenges that execute in real time. SQL queries run against a live PostgreSQL database. Python runs in a sandboxed Docker container. Data modeling problems validate against interactive schema canvases. All content is framed around what data engineering interviewers actually test at companies like Meta, Google, Amazon, Netflix, Stripe, and Databricks.

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DataDriven combines four interview rounds (SQL, Python, Data Modeling, Pipeline Architecture) with adaptive difficulty and spaced repetition. Easy problems get harder as you improve. Weak concepts resurface until you master them. Your readiness score tracks progress across every topic interviewers test. Every lesson section ends with problems you solve by writing and running real code, not by picking multiple-choice answers.