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Q: How would you design a system to integrate payroll and benefits information from multiple vendors? What did you answer? I described how I would design the data model, entities, and APIs, and considered scalability. However, the interviewer expected detailed payroll domain knowledge, which was not provided in the problem statement and is not something most candidates would know without prior experience.
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Senior Backend Engineer

Interviewed at Deel

4.4★
Aug 18, 2025

Q: How would you design a system to integrate payroll and benefits information from multiple vendors? What did you answer? I described how I would design the data model, entities, and APIs, and considered scalability. However, the interviewer expected detailed payroll domain knowledge, which was not provided in the problem statement and is not something most candidates would know without prior experience.

The first pair programming interview asked me to develop a currency conversion service, which gets rates from a third-party provider (which was stubbed out for the exercise), and progressively added problems of availability, scalability, reliability, etc. The systems design interview asked me to first design on a white board a system that takes a file listing bank transfers as an input, enriches each entry using an external service, and store them in a database. The second part of the interview was a high level implementation of the system using Java interfaces.
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Senior Backend Engineer

Interviewed at Wise

3.6★
Feb 17, 2023

The first pair programming interview asked me to develop a currency conversion service, which gets rates from a third-party provider (which was stubbed out for the exercise), and progressively added problems of availability, scalability, reliability, etc. The systems design interview asked me to first design on a white board a system that takes a file listing bank transfers as an input, enriches each entry using an external service, and store them in a database. The second part of the interview was a high level implementation of the system using Java interfaces.

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