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Senior Backend Engineer Interview Experience - London, England

December 2, 2025
Negative ExperienceNo Offer

Process

I applied through a staffing agency. The process took three weeks.

  • Initial screening: an easy call about past experiences to see if you're a good fit.
  • Pair coding: I passed easily.
  • System design: I thought I passed, though then I learned I had failed there with no explanation. By the way, I asked Gemini my design and the expected design (I can guess what they can expect), and yet Gemini also tells that my design is much better and satisfies the same thing, which can be done with a sliding window aggregator pattern (Flink-like design). So they have an answer key and expect the same design, which was a red flag for me anyway for a company who doesn't know what a system design interview is.

Questions

The process was pair coding a ledger system and designing a system to send notifications from a stream of events.

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Interview Statistics

The following metrics were computed from 4 interview experiences for the Monzo Senior Backend Engineer role in London, England.

Success Rate

50%
Pass Rate

Monzo's interview process for their Senior Backend Engineer roles in London, England is fairly selective, failing a large portion of engineers who go through it.

Experience Rating

Positive75%
Neutral0%
Negative25%

Candidates reported having very good feelings for Monzo's Senior Backend Engineer interview process in London, England.

Monzo Work Experiences