What are the hard and software requirements?

We normally run our platform on Linux servers and use Postgresql for the data. We have also been working with Oracle for many years so that is also an option - but it's not out of the box!

But utilisation of Docker and other DevOps tricks both simplifies the deployment and loosens the requirements.

If we host the server(s) for you all you need is a modern browser. If you host the servers on your premises or in your cloud then you just need a modern server with Docker installed. Then the deployment is basically copying the docker containers over.