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Blockchain 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, System Design, Scalability, Security, Innovation.

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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 related to blockchain development. After that, you can ask any questions you have about the role or the company.

Blockchain Problem-solving Challenge

50 min
•

Design a simple blockchain system that allows users to create transactions and mine blocks. Explain how you would ensure the security and scalability of the system.

What this question is for, and what to listen for

Purpose

Assess problem-solving, system design, scalability, security, and innovation skills.

Signals to score

  • Clear understanding of blockchain fundamentals
  • Logical and structured approach
  • Considers security measures
  • Addresses scalability concerns
  • Innovative solutions proposed
  • Explains thought process clearly
  • Considers real-world applications

Follow-up questions

  • Can you explain the basic components of your blockchain system?
  • How would you ensure the security of transactions?
  • What strategies would you use to handle scalability?
  • How does your design handle consensus?
•

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 consider adding?
  • How could you improve the security of your system?
  • Are there any scalability improvements you would suggest?
•

Great job on the problem-solving challenge!

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
Blockchain Developer
Round
Problem-solving Test for 60 min
Key skills
Problem Solving, System Design, Scalability, Security, Innovation

Blockchain Developer interviews — common questions

Who is this Blockchain 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 Blockchain 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, System Design, Scalability, Security, Innovation. It works through Introduction, Blockchain 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), Blockchain 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 Blockchain Developer?

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