I applied online.
There were four steps:
I got rejected after the fourth round, as admittedly I didn't perform well. Overall, the interviewers were very nice, and the interview process is fair, where they want to test real-world knowledge. However, the recruiter was very unprofessional. They joined the meetings late and took a long time to reply.
There were questions about projects, a take-home test, concurrency, and locks.
The following metrics were computed from 48 interview experiences for the Monzo Software Engineer role.
Monzo's interview process for their Software Engineer roles is extremely selective, failing the vast majority of engineers.
Candidates reported having mixed feelings for Monzo's Software Engineer interview process.