Experience and integrity are what we build on.
Here's why:
* Subject-Verb Agreement: The subject of the sentence is "experience and integrity" (plural), so the verb needs to be plural as well. "Are" is the correct plural form of the verb "to be."
* Word Order: The sentence structure should be "Subject - Verb - Object." In this case, "experience and integrity" are the subject, "are" is the verb, and "what we build on" is the object.
Here are some other ways to express the same idea:
* We build on experience and integrity.
* Our foundation is built upon experience and integrity.
* Experience and integrity are the cornerstones of our work.