Monzo Bank Sr. Software Engineer interview questions

Full interview process for a Senior SWE role. The experience included a technical project review, pair programming, and a final stage for System Design and Behavioral assessment. Early in the process, the role was re-leveled. This decision was communicated after limited technical interaction and before a comprehensive evaluation of my leadership background or career trajectory. The System Design session utilized a pre-structured Figma template. This format directed the discussion toward a specific, pre-determined solution, which limited the opportunity to demonstrate broader architectural reasoning or trade-offs. During the Behavioral interview, the atmosphere felt transactional. There was a notable lack of conversational engagement, and my responses were frequently abbreviated by the interviewers to meet strict time constraints. The session concluded prematurely, leaving minimal time for candidate inquiries. While preparation materials are provided, the actual execution felt rigid and focused on internal checklists. I would advise future candidates to be prepared for a highly structured environment (or avoid it) where leveling decisions may occur early in the cycle.

It started with a recruiter call where we discussed my background, the role, and expectations. The second round was a technical discussion around my current project — the interviewer asked in-depth questions about my architecture choices, challenges faced, and the trade-offs I made, which felt more like a real engineering conversation than a typical Q&A. Next came a take-home assignment to implement a web crawler, which was a good test of practical coding, design thinking, and handling edge cases like concurrency and duplicate URLs. After that, I had a behavioural round heavily centered around Amazon's Leadership Principles — answers were expected in the STARR format (Situation, Task, Action, Result, Reflection), so preparing structured stories in advance is essential. The final stage was a system design interview, where I had to architect a scalable solution and discuss trade-offs. Overall, the process was challenging but fair, and communication from the recruiter was timely throughout.