The example sentence is:
The Views Framework is a core feature of Ambari and specific Views build on that Framework.
So why it is build, not are built? How meaning would changed if it had been are built instead?
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Sign up to join this community"Build(s) upon" tends to mean 'This thing uses that thing and extends and improves it's capabilities.'
On the other hand, "is/are built upon" just means that 'This thing uses that thing, but it doesn't necessarily improve it in any way'.