Monzo Bank Software Engineer Interview Questions
& Process

The interview process at Monzo is quite structured and spans about a month. You get a lot of feedback throughout, and you meet many people, which is a plus. However, it doesn't allow you to meet the people you'd actually be working with, making it hard to judge team fit – it's basically a gamble on what team you might join. It starts with a recruiter screen, which is standard. Then there's a call to talk about a past project. After that, it's either a technical take-home assignment or a pairing session. The last stage is a two-hour system design and behavioral interview. It's an intense process overall. The system design part is unusual; they seem to be looking for a very specific solution using particular technologies (Kafka and Cassandra), rather than exploring different approaches. They gloss over core system design concepts like queueing, redundancy, and caching. The behavioral interview heavily emphasizes impact and products, asking for examples of your best projects, almost like an Engineering Director role. Apparently, everyone goes through this, which feels like overkill. The interviewers are nice, but the pressure is extremely high. I don't think the compensation justifies this level of intensity; they seem to want FAANG-level talent but offer lower salaries. They should probably add £50-75k to their senior bands. Given the pay and my experience, I wouldn't have accepted an offer.

It was a long process, but very thorough and the recruiters were quick to communicate. Started with the usual recruiter screen. Then I had a 1-hour session with a developer where I had to talk about a past project. After that, you could either do a take-home assignment or a pair coding session. I chose the take-home. Then, another 1-hour call with an engineer to go over my solution, discuss design choices, how I'd adapt to changing requirements, and fault tolerance. After that, a 1-on-1 with the lead recruiter who shared feedback from the first two sessions and hinted at questions for upcoming stages. For System Design, definitely listen to interviewer advice and brush up on DDIA, especially concurrency, consistency, and network faults, as they really dig into those. My SD task was similar to a common one but had a crucial twist that made typical solutions not work, so be ready to design from scratch, not just memorize. Behavioral Interview was pretty standard, just prep well and get comfortable with the STARR method, emphasizing the 'Reflection' part to show what you learned.

I applied online and quickly heard back for a recruiter call. The recruiter told me about the company and asked about my background. After that, I had a Depth of Expertise interview where I discussed a challenging project and answered technical questions about it. I was told I passed and then had to choose between a Live Coding session or a Take-Home task. Since the live coding was limited in language options, I chose the Take-Home. I submitted my code and set up a call with an engineer. My code wasn't the best, so I didn't pass this round. I got feedback a few days later. The process was fast, the recruiter was helpful and responsive, and the feedback was good. The next steps would've been System Design and then a Behaviour/Culture Fit interview. Overall, it was a positive experience, even though I didn't advance.