Firmware Engineer II
Posted Oct 1, 2026 · We last checked this listing on Oct 6, 2026
Likely interview questions for this role
Written from this job description, not a generic list. Each one notes what the interviewer is really checking.
About your past
Tell me about embedded firmware you've written in C. What hardware did it run on and what did it do?
What they are checking: Whether they have real hands-on embedded C experience on microcontrollers.
Tell me about a bug that was really hard to find. How did you finally find it?
What they are checking: Whether they are persistent and methodical when debugging.
How do you test your own code before handing it to a test team?
What they are checking: Whether they take responsibility for quality with unit tests and bench checks.
What would you do
Your firmware works in the debugger but fails when the tool runs on its own. What could be going on?
What they are checking: Whether they think about timing, watchdogs, optimization and power-up issues.
The hardware engineer changes a pin assignment late in the project. How do you handle it?
What they are checking: Whether they collaborate smoothly with hardware and manage late changes carefully.
About the work
How do interrupts work on a microcontroller, and what problems can happen if you do too much work inside one?
What they are checking: Whether they understand timing and shared data issues in real-time firmware.
How would you read a trigger switch and control motor speed smoothly in a cordless drill?
What they are checking: Whether they can connect inputs, ADC readings and PWM output in a practical control loop.
How do you share data safely between an interrupt and the main loop?
What they are checking: Whether they understand volatile, atomic access and critical sections.
How do you use a scope or logic analyzer alongside the debugger to find a firmware problem?
What they are checking: Whether they debug at the hardware level, which embedded firmware for tools requires.
How do you make sure the tool fails safely if the firmware hits an unexpected state?
What they are checking: Whether they think about safety in firmware for powerful tools.
How do you use version control and code reviews on a firmware team?
What they are checking: Whether they work well in a team codebase with good practices.
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Practice this out loudThe full job description
As published by Milwaukee Tool.