[iscoelho]

The article is unfortunately not very specific and I can not find much information with a quick search, but:

It's very possible that they did this all on their own provided they rented cabinets/cages in an existing facility like Equinix, which is extremely common. Then they do not need to manage power/generators, fiber into the building, or any other data center necessities.

It does not take very many people to do the wiring inside a cage, especially considering Dropbox has been doing this over the span of a few years. If you've ever been physically in a data center (personally visited a few Equinix facilities myself), it's mostly one person from a company working in a cage that is wiring everything. I've rarely seen multiple people do wiring, and that same person will come back every day thereafter to continue working until the job is done.

What they are doing sounds entirely feasible. If money is no object in regards to equipment, with 3 data centers, I'd honestly say you only need 4 competent people to get the job done.

3 on-site. 1 remote/office.

From there, the more the merrier. A guy to lift the equipment up as well is nice sometimes - can be pretty heavy!