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2,356 firmware interview questions shared by candidates

Here is a series of execrcise. We will judge you on the results of the exercise even though they do not reflect in any way you potential for this Job. we have many people in the pipeline and you are mostly just a filler to make the process look busy: please respond.
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Automation Dev and QA Engineer - Linux - Firmware - Python

Interviewed at HCLTech

3.5★
Jul 22, 2017

Here is a series of execrcise. We will judge you on the results of the exercise even though they do not reflect in any way you potential for this Job. we have many people in the pipeline and you are mostly just a filler to make the process look busy: please respond.

Technical interview asked coding questions like: Give a code snippet, what does this function do and what are some issues? Given a code solution that works but sometimes crashes, point out flaws and issues and how you would fix them or why they're a problem
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Senior Firmware Engineer

Interviewed at Sphero

3.7★
Mar 11, 2022

Technical interview asked coding questions like: Give a code snippet, what does this function do and what are some issues? Given a code solution that works but sometimes crashes, point out flaws and issues and how you would fix them or why they're a problem

Implement in C some kind of routine that works such that you can, via a function, provide it with a time T and a void* callback, such that in T time from now, the callback will be automatically called. Specifically, optimize the solution to the first 256 units of time since most schedueling will be done for them. To somewhat rephrase things, the system simulates several timers at once using its single internal clock, optimized around a specific time (i.e. the worst case can still be O(log(n)) but the most common/average case of times between 0 and 256 need to be O(1) The second question was more like a riddle,
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Firmware Engineer

Interviewed at NVIDIA

4.6★
Sep 29, 2025

Implement in C some kind of routine that works such that you can, via a function, provide it with a time T and a void* callback, such that in T time from now, the callback will be automatically called. Specifically, optimize the solution to the first 256 units of time since most schedueling will be done for them. To somewhat rephrase things, the system simulates several timers at once using its single internal clock, optimized around a specific time (i.e. the worst case can still be O(log(n)) but the most common/average case of times between 0 and 256 need to be O(1) The second question was more like a riddle,

Write code to represent a safe deposit box. The problem with this question is that the U/X, and the interactions with the "real world", are what matter but the interview could not answer much about those aspects. The code itself is nonsense absent a clear and complete analysis of U/X.
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Firmware Engineer

Interviewed at Samsara

4★
Nov 25, 2019

Write code to represent a safe deposit box. The problem with this question is that the U/X, and the interactions with the "real world", are what matter but the interview could not answer much about those aspects. The code itself is nonsense absent a clear and complete analysis of U/X.

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