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Full Stack Developer interview questionsProblem-solving 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: Problem Solving, Debugging, Optimization, Performance Tuning, Code Refactoring.

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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 problem-solving challenge. After that, you can ask any questions you have about the role or the company.

Problem-solving Challenge

50 min
•

Challenge 1: Optimize a Web Application Scenario: You are given a web application that loads data from an API and displays it on a dashboard. The application is slow and users are experiencing delays. Task: Identify potential bottlenecks and propose solutions to improve performance. Follow-up Questions: - What tools would you use to diagnose the performance issues? - How would you prioritize the changes? - How would you ensure that your optimizations do not introduce new bugs?

What this question is for, and what to listen for

Purpose

Assess problem-solving, debugging, optimization, and performance tuning skills.

Signals to score

  • Identifies key performance bottlenecks
  • Proposes realistic solutions
  • Considers user experience
  • Demonstrates understanding of web technologies
  • Uses appropriate tools for diagnosis
  • Prioritizes changes effectively
  • Ensures code quality and stability

Follow-up questions

  • What specific areas of the application would you investigate first?
  • How would you measure the impact of your changes?
  • Can you describe a similar situation you’ve handled before?
•

Challenge 2: Refactor Legacy Code Scenario: You are tasked with refactoring a legacy codebase to improve maintainability and performance. Task: Describe your approach to refactoring and the steps you would take to ensure a smooth transition. Follow-up Questions: - How would you handle dependencies in the legacy code? - What strategies would you use to test the refactored code? - How would you communicate changes to the team?

What this question is for, and what to listen for

Purpose

Assess code refactoring, maintainability, and communication skills.

Signals to score

  • Understands the importance of clean code
  • Proposes a structured refactoring plan
  • Considers impact on existing functionality
  • Ensures thorough testing
  • Communicates changes effectively
  • Balances performance and maintainability

Follow-up questions

  • What are the key indicators that code needs refactoring?
  • How do you ensure that refactoring doesn’t break existing features?
  • Can you provide an example of a successful refactoring project?
•

Great job on the problem-solving challenges!

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
Problem-solving Test for 60 min
Key skills
Problem Solving, Debugging, Optimization, Performance Tuning, Code Refactoring

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 Problem-solving 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 Problem-solving Test round assess?
This round is focused on: Problem Solving, Debugging, Optimization, Performance Tuning, Code Refactoring. It works through Introduction, Problem-solving 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), Problem-solving 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: