Reference Architecture
The Structure of a Successful Internal Developer Platform
In a platform reference architecture there are five main planes that make up an IDP:
- Developer Control Plane – this is the primary configuration layer and interaction point for the platform users. Components include Workload specifications such as Score and a portal for developers to interact with.
- Integration and Delivery Plane – this plane is about building and storing the image, creating app and infra configs, and deploying the final state. It usually contains a CI pipeline, an image registry, a Platform Orchestrator, and the CD system.
- Resource Plane – this is where the actual infrastructure exists including clusters, databases, storage or DNS services. 4, Monitoring and Logging Plane – provides real-time metrics and logs for apps and infrastructure.
- Security Plane – manages secrets and identity to protect sensitive information, e.g., storing, managing, and security retrieving API keys and credentials/secrets.

(source: https://humanitec.com/blog/wtf-internal-developer-platform-vs-internal-developer-portal-vs-paas)
Humanitec
https://github.com/humanitec-architecture
https://humanitec.com/reference-architectures