We gained significant experience with all cloud service models, including Infrastructure as a Service (IaaS), type of online services that hide the low-level details of underlying network infrastructure and physical resources via virtualization. This allows businesses to purchase resources on demand and as needed, instead of having to buy hardware outright, but still requires significant skills to maintain the infrastructure.

Platform as a Service (PaaS) provides developers with a framework they can use to build custom applications upon, without having to deal with data serving, storage, management, and similar tasks.

Software as a Service (Saas) refers to cloud-based software solutions that are hosted online and are available for purchase on a subscription basis.

Backend as a Service (BaaS) provides application developers with a mechanism to connect their applications to cloud storage and other computing services with APIs and SDKs exposed to their applications.

Going further, we started using serverless computing - a code execution model in which the cloud provider fully manages starting and stopping virtual machines as necessary to serve requests. In terms of architecture the solutions are composed of small, independent and scalable customer-focused services that communicate over standard protocols and with well-defined interfaces.