There is not a single door that Google or Facebook opens that other silicon valley brand name companies such as Amazon, Netflix, Uber, etc don't open. There is huge diminishing returns in company brand name value once you already at a household name.
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But obviously an ex google, ex fb tech lead is top tier prestige.
They hire phds from top schools
https://www.wsj.com/articles/the-quants-run-wall-street-now-1495389108
Another firm beat them out by offering someone with 0 YoE $700k. Crazy high.