As mentioned by others, the standard interview process was used.
The pair programming was a complete failure, as the interviewers had no idea what pair programming entailed.
The question itself was standard, but the interviewers didn't mention what they were looking for, and I doubt they evaluated it in any standard way.
They certainly require you to remember all the functions you might need, including a reverse string function with full parameters (what the heck!?), or have an IDE that helps with this, not just a text editor.
The following metrics were computed from 15 interview experiences for the Stripe Software Engineer role in New York, New York.
Stripe's interview process for their Software Engineer roles in New York, New York is extremely selective, failing the vast majority of engineers.
Candidates reported having mixed feelings for Stripe's Software Engineer interview process in New York, New York.