You only mentioned Foursquare as one of the companies you've applied to, so without more info from you I'm going to take a shot in the dark here: are you only applying for those types of companies that are very well known? It's pretty rare for your first job out of education (whether it's a degree, or a bootcamp) to be "SWE at <Company Your Friends Know>". There's a whole world of companies out there that aren't as sexy but can be amazing stepping stones to the job you want.

To add personal experience to this comment, I've worked at two places before landing such a "dream" job - a < 50 person startup, and a company with businesses around its satellites that employs ~5000 people but I guarantee your average citizen hasn't heard of it. Some former coworkers at that startup were there as their first job, and went on to work for Google/Palantir/themselves. These less sexy companies and startups are waiting for great applicants.