Real-world orchestration patterns with Camunda + Spring Boot + Kafka, modeled on telecom number portability: sagas, compensation, human tasks, SLA timeouts.

Spring Boot auto-configuration for Keycloak-secured resource servers: realm/resource role mapping + RFC 7807 error responses

Custom Keycloak SPIs done properly: real providers, each with tests, no toy examples.

Java/Spring engineering notes from 10+ years in telecom BSS production: architecture decisions, failure write-ups, debugging recipes, and a telecom domain guide you won't find in another repo.

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