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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.
Opening
· 5 minWho is interviewing, how the round will run, and a question to settle the candidate in. The standard openingProblem-solving Challenge
50 min
What this part is for
Purpose
Evaluate technical knowledge and problem-solving skills in real-world scenarios.
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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?
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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?
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Great job on the problem-solving challenges!
What this line is for
Purpose
Provides positive reinforcement to the candidate, helping to build confidence and create a supportive atmosphere before moving into the final part of the interview.
Closing
· 5 minTheir questions for you, and what happens next. The standard closingFull 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 — 2 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 Problem-solving Challenge, scoring against 13 observable signals, with follow-up prompts on both questions for going deeper where an answer is thin.
- How is the 60 min split up?
- 5 min opening, 50 min on 2 questions and 5 min closing. The questions take in Problem-solving Challenge (50 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:
Hiring for this role?
Open this plan in Hirezen and make it a position in one click.
- Every interviewer runs the same script and marks the same signals.
- AI drafts the write-ups, and the debrief puts every read side by side.
- No ATS to set up first, and no bot in the call.
Free for your first open role.