Company announcements feed
Your task
Design the backend for a simple announcements feed inside a company app: an admin posts announcements, and all employees see them newest-first with infinite scroll. There are a few hundred announcements total and a few thousand employees who open the feed throughout the day. It is extremely read-heavy with rare writes. Cover the data model, how the feed is paged, and how you serve the heavy read traffic cheaply.
It covers
- Pagination
- Caching