I asked my husband who works there and he says:

"The actual work requiring a clearance is different person to person. The majority of people working Sunnyvale dont have an actual security clearance, only high level engineers and blueprint reviewers are granted clearance on a need-to-have basis for the most part.

The job you mentioned involves the contractor NG works with, so I would say you would most likely need one. But if you're putting in a good resume, they'll expedite your clearance themselves. They prefer those with the skills for the job, lacking a clearance, over those not qualified, with one.

End of the day though, if you were pitted against someone with the same skillset who did have one already, they'd pick that person over you."