Another of my Sons just took a job with a large tech company.
...Get your resume to the decision makers that you either know as friends/relatives/co-workers, or can help get your resume in front of the decision maker not HR.
He got that done and the decision maker had HR draw up a new job search that only he could fill.
Nothing against your son, because I know he went to a good school and probably is qualified. But this type of hiring practice is why tech companies are overwhelmingly White and Asian.