I applied online.
Do yourself a favor and use Python for their interviews... Java had me waste 15 mins on just setting up input. Plus, with the time limit, you're going to have a much easier time in Python. (The question itself is not difficult, but VERY long and detailed.)
The interviewer was really nice and helpful, though, which I appreciated, and I wish him all the best.
The following metrics were computed from 368 interview experiences for the Stripe Software Engineer role.
Stripe's interview process for their Software Engineer roles is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Stripe's Software Engineer interview process.