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Full Stack Developer interview questionsCoding 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: Coding, Frontend & Backend, JavaScript, Server-side Languages, Frameworks.

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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 see your coding skills today.

•

Could you briefly introduce yourself and share your experience with full stack development?

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
  • Alignment with full stack role
  • Specific skills highlighted
  • Response is concise and organized
  • Understanding of role requirements

Follow-up questions

  • What excites you most about full stack development?
  • How does your background align with our team’s work?
•

Great, thank you for sharing! Let's move on to the coding challenge.

Coding Challenge

50 min
•

Build a simple RESTful API using Node.js and Express that performs CRUD operations on a 'Product' resource. The 'Product' should have fields: id, name, description, and price. Follow-Up Questions: - How would you handle errors in your API? - How would you secure your API? - How would you test your API?

What this question is for, and what to listen for

Purpose

Assess problem-solving, coding proficiency, and understanding of backend development.

Signals to score

  • Clear understanding of RESTful API concepts
  • Logical and structured approach
  • Explains thought process
  • Considers edge cases
  • Efficient, clean, well-formatted code
  • Tests and debugs the code effectively
  • Open to feedback and adjusts accordingly

Follow-up questions

  • Can you explain your thought process on how to approach building the API?
  • How do you plan to handle edge cases in your API?
  • 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 additional features would you add to enhance the API?
  • How would you improve the performance of your solution?
•

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
Full Stack Developer
Round
Coding Test for 60 min
Key skills
Coding, Frontend & Backend, JavaScript, Server-side Languages, Frameworks

Full Stack Developer interviews — common questions

Who is this Full Stack Developer interview plan for?
It is written for the interviewer, not the candidate: the hiring manager, engineer or panel member running the Coding Test round for a Full Stack Developer 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 Coding Test round assess?
This round is focused on: Coding, Frontend & Backend, JavaScript, Server-side Languages, Frameworks. It works through Introduction, Coding Challenge and Closing, scoring against 27 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), 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 Full Stack Developer?

A single round does not cover a whole role. The other rounds in this library for a Full Stack Developer: