Startups get to pick their answer for this question, or die.
One option is to develop sources of talent which Google's hiring process doesn't reach. They are helped in this by the fact that Google's hiring process is, as has been widely reported, a disaster.
Another option is telling folks that working at a startup with not be like working at BigCo. This is sometimes explained using some or all of: you'll be part of the family, work on things that directly impact users, learn quickly about a wide variety of topics rather than getting to be the world's leading expert in configuring BigCo's proprietary form generator and then repeating that every two weeks for the rest of your career, get to live an extended adolescence during your tenure there (foosballs and drinking and laundry taken care of for you!), etc.
One option is to develop sources of talent which Google's hiring process doesn't reach. They are helped in this by the fact that Google's hiring process is, as has been widely reported, a disaster.
Another option is telling folks that working at a startup with not be like working at BigCo. This is sometimes explained using some or all of: you'll be part of the family, work on things that directly impact users, learn quickly about a wide variety of topics rather than getting to be the world's leading expert in configuring BigCo's proprietary form generator and then repeating that every two weeks for the rest of your career, get to live an extended adolescence during your tenure there (foosballs and drinking and laundry taken care of for you!), etc.