I applied online. The process took 3 weeks.
As everyone else said. The process was a phone call, a take-home web crawler test, a video conference to explain what you have done for 45 minutes, and an on-site interview for 2 hours (1 hour of system design and 1 hour of general technical).
I did apply a year later again after I failed on the last round and got very positive feedback. For some reason, I didn't pass the take-home assignment, although again the feedback was good by the interviewer, proving how random and maybe a bit unjust their process can be. Give it a shot and interview. It seems a good place, but it's not much different from many other places where the interview is random, communication is bad, and treatment is poor. The colour of their card makes them stand out, but not their attitude.
Design a web crawler in any language.
The following metrics were computed from 14 interview experiences for the Monzo Backend Engineer role in London, England.
Monzo's interview process for their Backend Engineer roles in London, England is fairly selective, failing a large portion of engineers who go through it.
Candidates reported having good feelings for Monzo's Backend Engineer interview process in London, England.