I wonder what Dropbox is using. Of course they mention 'custom' software and possibly hardware, but I'm pretty sure it'll be some sort of Intel-based setup, may

I wonder what Dropbox is using. Of course they mention 'custom' software and possibly hardware, but I'm pretty sure it'll be some sort of Intel-based setup, maybe OCP, and Linux. The might be some hypervisory things going on, possibly Xen, maybe KVM. Then there will be some sort of firmware/OOB management as well, and perhaps some non-standard connectivity. Those are mostly given. What runs on top of it, that's what interests me. Some orchestration/ private cloud software, some container platform, and perhaps a storage platform, which/what are those for Dropbox? Would it be standard OpenStack, Kubernetes and the true in-hous stuff: dropbox object storage?