The interview process began with a phone screen, followed by a half-day onsite comprised of back-to-back, hourlong in-person interviews.
The onsite interviews seemed relevant to the internship I was applying for. I was asked to solve, and actually code up, actual problems that Stripe had faced, such as how to detect fraudulent merchants' websites.
See http://www.quora.com/What-is-the-engineering-interview-process-like-at-Stripe for a good description of the interview process.
The following metrics were computed from 2 interview experiences for the Stripe Engineering role in San Francisco, California.
Stripe's interview process for their Engineering roles in San Francisco, California is fairly selective, failing a large portion of engineers who go through it.
Candidates reported having very good feelings for Stripe's Engineering interview process in San Francisco, California.