Getting Started with Apache Kafka: What I Learned Building Event-Driven Microservices at Ericsson

When I first heard the word "Kafka" in a technical meeting at Ericsson, I nodded confidently while quietly Googling it under the table. A few months later, I was designing Avro schemas, building consumer groups, and debugging lag metrics in production. This is everything I wish someone had told me when I started. 🎯 What Is Apache Kafka — In Plain English Imagine a post office. Instead of letters, services send events — things that happened, like "user logged in" or "notification dispatched" . Instead of delivering directly to recipients, every event goes into a central post box (Kafka) . Any service that cares about that event can pick it up whenever it's ready. This is event-driven architecture. And Kafka is the most battle-tested way to build it. The technical version: Apache Kafka is a distributed event streaming platform that lets you: Publish events from producer services Store events reliably and durably Subscribe to events from consumer services Process streams of events in real