Here is some unsolicited advise from an old timer. As a backup, do one of your internships in a dev shop. It can be Google, Amazon, Facebook, whatever. The key

Here is some unsolicited advise from an old timer. As a backup, do one of your internships in a dev shop. It can be Google, Amazon, Facebook, whatever. The key thing is ... it has to be non-research. It is far easier to do this kind of exploration as a student than later. Best of luck with your PhD and beyond!