Backend Developer Interview Questions

9,173 backend developer interview questions shared by candidates

- Explain polymorphism - Explain inheritance - What’s the difference between pass by value and pass by reference? - Where does Python store data on the stack or the heap? - How does a dictionary work under the hood in Python? - Name some design patterns and when you’ve used them - What's one thing/project in your career that you're most proud of and why?
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Backend Software Engineer

Interviewed at Wayflyer

3.8
Jul 16, 2025

- Explain polymorphism - Explain inheritance - What’s the difference between pass by value and pass by reference? - Where does Python store data on the stack or the heap? - How does a dictionary work under the hood in Python? - Name some design patterns and when you’ve used them - What's one thing/project in your career that you're most proud of and why?

The screening interview didn't have any difficult worth mentioning question. The kotlin project was simple but they wanted form you to make a lot of additional work that shows how you will work in a similar project in a production environment.
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Software Engineer, Backend

Interviewed at Pleo

3.2
Oct 24, 2019

The screening interview didn't have any difficult worth mentioning question. The kotlin project was simple but they wanted form you to make a lot of additional work that shows how you will work in a similar project in a production environment.

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