TL;DR — Cloud Storage Service

Design a cloud object storage service like Amazon S3 that stores arbitrary objects (files, images, backups, data lake files) with extreme durability (99.999999999% — eleven 9s), high availability, and a simple HTTP API. Users create buckets (namespaces), upload objects with keys, and retrieve them by key. The system must scale to exabytes of data across millions of users. Key features: Create and manage buckets (namespaces). PUT/GET/DELETE objects up to 5TB in size.