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 In enterprise workflows, long-running business logic should not execute inside the workflow engine . Instead, Camunda uses the External Task Pattern — where workers fetch tasks and process them independently. This is the most scalable way to integrate microservices with BPM. In this guide you will learn: What External Tasks are Why they are important How to implement using Spring Boot Best practices for production 📌 What is the External Task Pattern? In Camunda Platform , a Service Task can be executed outside the engine. Instead of pushing work → the worker pulls the job . So the engine never blocks. 🖼️ External Task Architecture 4 🧠 Why External Tasks? Traditional Service Task: Engine calls service directly → Tight coupling → Failures block workflow External Task: Worker fetches job → Loose coupling → Retry possible → Highly scalable 🛠 Step 1: Create External Service Task in BPMN In Modeler: Service Task → Type = External Topic name example: payment-service Now Camunda wait...