I applied through a recruiter. The process took 5 weeks.

TL;DR: Never mind the interviews, all they care about is if you have some sort of European finance background. It was a relatively extensive process of five interviews total:

• The first one was with another Mobile developer, who asked about past experience and challenging projects.
• A take-home assignment with a four-hour time box, which was nothing too fancy.
• A debrief for the exercise with another developer.
• A behavioral interview, mostly about how you push forward or back from stakeholders.
• A system design interview, which was the classic design of a view holding a list of items.
• A final interview with a senior staff engineer, who was more interested in how my current job is going.

Overall, it was an easy process, although several of the interviewers seemed quite arrogant. Finally, I was asked to provide details about why I had left previous positions. In the end, they wound up offering me a position of lower seniority than the one I have now. Their main argument was that I hadn't spent enough time at the "right-sized companies" (their words, not mine), and they framed joining Monzo as a great opportunity for me, as they were better than my current employer. They had my CV from the beginning, and I wish they had been more forthcoming from the start.

Tell us about a time when you had to convince other developers to do something...