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Duffel Lead Engineer interview questions

based on 1 rating - Updated 25 July 2025

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Lead Engineer Interview

25 July 2025

Anonymous interview candidate

No offer

Negative experience

Easy interview

Application

I applied through a recruiter. I interviewed at Duffel (London, England) in July 2025

Interview

- 4 interviews, scheduled over 2 steps - First, remote 60-min coding exercise - Second, in-person: - 90-min live coding - Break - HR interview (behaviour) - Break - Interview with Steve

Interview questions [1]

Question 1

Given an API response as JSON (or equivalent in your choice of language), sort the response by price. Assume the code you write will be running in FE (client-side). The API response wasn't homogenous, it included records from different sources with different schemas. The currencies were also different.

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Senior Customer Success Manager

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Duffel

Duffel Lead Engineer interview questions

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