Standard Pattern

All of the Mobile Apps follow a broadly similar pattern. It is described below but each app will have slight differences which are documented on their individual pages.

Application Load Balancer (ALB)

The only public component. Routes requests to the CMS or NHS login backend based on the Host header.

Content Management System (CMS)

Django-powered API for in-app content. Content is managed via the Django admin site.

S3 and Cloudfront

Media is uploaded to S3 via the CMS admin and served through CloudFront.

FastAPI service that authenticates via NHS login and provides a user data sync API.

Redis

Caches token state to enforce single active sessions (i.e. single devices) and prevent sync conflicts.