Part 1
3 chapters
The demo application
A small e-commerce domain, the shared infrastructure it runs on, and a bare service skeleton in Spring Boot, Quarkus, and Python before any signal is added.
Chapter 5
The e-commerce domain
The order, inventory, payment, shipping, notification, and review services this tutorial instruments, and how a single order request moves through them.
Chapter 6
The shared infrastructure
The one compose.yaml all three language tracks build on: service-name DNS, healthchecks, the x-service-env anchor, and per-language profiles.
Chapter 7
Service skeletons
The order, inventory, payment, review, shipping, and notification services running with telemetry off — REST, gRPC, GraphQL, and Kafka in their plainest form, before Part 3 turns the signals on.