First you need to be born autistic, then you can "unmask", which is done by acting more autistic on pupose until certain behavioral patterns stick. Some people have luck with suppressing more harmful stims while replacing them with those that are not, but it's not universal.
To be fair, there are jobs where it is informally a requirement. They just don't come right out and say it. In fact, they may not even know themselves that they are effectively screening positively for Autism.
Apparently, NSA and NRO like people with anxiety disorders because they are more risk-averse, suspicious, pessimistic and paranoid, and these things are useful when you're trying to identify chemical weapons sites and missile silos from satellite imagery or rapidly evaluate the purpose of unexpected network traffic.