Quantum Cloud Service is a homegrown private cloud platform based on open source, including Openstack, Kubernetes, and Ceph.

QCS adopts a multi-cloud strategy to ensure continuous and uninterrupted service.
This means running development, QA, and production systems on separate clouds, with Kubernetes as the underlying platform to ensure consistency in development and production.
In addition, the development/QA system is built on a private cloud to reduce costs, and the production system is built on a public cloud for reliability and scalability.
It's worth noting that development and QA systems can be separated by namespace in one cloud if needed.

Other benefits of QCS include a sophisticated CI/CD system to quickly create a runtime environment that matches the source branch, and the ability to connect to any public cloud that provides Kubernetes services.
For virtual resources, virtual instances are controlled by Openstack, containers by Kubernetes, and virtual disks by Ceph.

Examples of adoption to date include the LG AI Lab CI/ CD platform, Digital Companion Service (government projects), AI Speaker Service (Company I), and Jonathan AI Service Cloud (Company A - https://www.iacryl.com).