Submitted resume and was rejected a few days afterwards by email.

It seems like they do not accept students who would need visa sponsorship after graduation. There's nothing wrong (or illegal) about not being able to sponsor visas, though would've been good if they'd been up-front about this on their careers webpage and I wouldn't have bothered applying; overall, it just seems like a disrespectful way to treat candidates and leaves a bad taste in my mouth about the company (especially since they love to advertise their roles so heavily at my university).

So in summary, I would advise non-EU nationals to avoid - try first instead for other tech firms such as FB (where I had a great interview experience last year).

FYI, I also interviewed with Two Sigma (London office), for a SWE role where my recruiter was at least up-front about the fact that they wouldn't be able to sponsor visas; that is a much more respectful way to go about things.