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Embedded Systems Engineer interview questionsFirmware Coding Test round

A 60 min interview plan with a time-boxed script, what each question is for, and the signals to score against. Key skills: Firmware Coding, Hardware Interaction, Low-Level Programming, Optimization, Problem Solving.

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Introduction

5 min
•

Hi, I’m [YOUR_NAME], and I’m a [YOUR_TITLE] at [COMPANY_NAME]. I’m excited to learn more about your experience today.

•

Could you briefly introduce yourself and share what attracted you to apply for this position?

What this question is for, and what to listen for

Purpose

Assess communication skills, alignment with the role, and initial confidence.

Signals to score

  • Clear introduction provided
  • Relevant experience mentioned
  • Motivations for applying explained
  • Alignment with team values
  • Specific skills highlighted
  • Response is concise and organized
  • Understanding of role requirements

Follow-up questions

  • What excites you most about this position?
  • How does your background align with our team’s work?
•

Great, thank you for sharing! In the next 50 minutes, we’ll dive into a coding challenge to assess your technical skills.

Firmware Coding Challenge

50 min
•

Challenge: Implement a function to read data from a sensor connected via I2C and process the data to calculate the average value over a given period. Requirements: - Use a microcontroller environment. - Assume the sensor provides data in a 16-bit format. - Implement error handling for communication failures. Follow-up Questions: - How would you optimize the data reading process? - What are potential pitfalls in I2C communication?

What this question is for, and what to listen for

Purpose

Assess firmware coding, hardware interaction, low-level programming, and problem-solving skills.

Signals to score

  • Clear understanding of I2C protocol
  • Logical and structured approach
  • Efficient error handling
  • Considers edge cases
  • Clean, well-documented code
  • Tests and debugs effectively
  • Open to feedback and adjusts accordingly

Follow-up questions

  • Can you explain your approach to handling I2C errors?
  • How do you ensure data integrity during communication?
  • Can you walk me through your code and explain each step?
•

If you had more time, what would you change in your solution?

What this question is for, and what to listen for

Purpose

Assess the candidate's ability to reflect on their work, identify areas for improvement, and demonstrate critical thinking and problem-solving skills.

Signals to score

  • Recognizes limits in their original answer.
  • Points out clear areas to improve.
  • Suggests specific changes.
  • Talks about how changes could help performance.
  • Shares ideas clearly and logically.
  • Shows a desire to learn and improve.

Follow-up questions

  • What specific part of your code would you optimize?
  • How would you handle additional sensor errors?
•

Great job on the coding exercise!

Closing

5 min
•

Do you have any questions for me about the team or the company?

What this question is for, and what to listen for

Purpose

Gauge the candidate’s curiosity and interest in the role.

Signals to score

  • Thoughtful questions asked
  • Interest in company culture
  • Curiosity about growth expressed
  • Questions about role raised
  • Inquiries about team challenges
  • Engagement with responses shown
  • Desire to learn next steps
  • Focus on company values expressed

Follow-up questions

  • What interests you most about this team?
  • Are there any areas of the role you’d like to explore further?
•

Thank you for your time today. We’ll be in touch soon regarding the next steps.

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Interview Template
Position
Embedded Systems Engineer
Round
Firmware Coding Test for 60 min
Key skills
Firmware Coding, Hardware Interaction, Low-Level Programming, Optimization, Problem Solving

Embedded Systems Engineer interviews — common questions

Who is this Embedded Systems Engineer interview plan for?
It is written for the interviewer, not the candidate: the hiring manager, engineer or panel member running the Firmware Coding Test round for a Embedded Systems Engineer role. It gives you a 60 min script to follow in the conversation — 4 questions with what each one is for and the signals to score against — so you are not writing the round from scratch the night before.
What does the Firmware Coding Test round assess?
This round is focused on: Firmware Coding, Hardware Interaction, Low-Level Programming, Optimization, Problem Solving. It works through Introduction, Firmware Coding Challenge and Closing, scoring against 28 observable signals, with follow-up prompts on all 4 questions for going deeper where an answer is thin.
How is the 60 min split up?
Introduction (5 min), Firmware Coding Challenge (50 min), Closing (5 min). The timings are there so the round stays on schedule and every candidate gets the same shape of interview — which is what makes two candidates comparable afterwards.
What other rounds should I run for a Embedded Systems Engineer?

A single round does not cover a whole role. The other rounds in this library for a Embedded Systems Engineer: