Blockchain Developer Interview Questions

A Blockchain developer is responsible for developing and optimizing blockchain protocols, crafting the architecture of blockchain systems, developing smart contracts and web apps using blockchain technology. Blockchain developers are responsible for the full life cycles of blockchain applications, from research and analysis to design and execution.

Blockchain is a special database which gained popularity because of cryptocurrencies adopting it, especially bitcoin. Blockchain development is used together with cryptocurrencies to implement peer-to-peer (P2P), distributed services. Blockchain’s primary usage is large, public databases that are immutable—in other words, they can’t be tampered without spending massive amounts of resources.

Whether you're a job seeker preparing to be interviewed for the role of Blockchain Developer or an employer preparing to interview candidates for Blockchain Developer position, these Blockchain Developer interview questions will help you prepare yourself for the job interview session.

Blockchain Developer Interview Questions

Below are a list of some skill-based Blockchain Developer interview questions.

1. What is Blockchain Technology?
2. What is the main principle of Blockchain Technology?
3. What are blocks in Blockchain Technology?
4. How many types of blockchain are there? Explain.
5. How is a block recognized within a blockchain?
6. What are the different types of records present within a blockchain database?
7. Are alterations possible once data is written in a block?
8. In order to incorporate Blockchain Technology in an organization, are there any specific requirements?
9. What is encryption and what is its role in blockchain?
10. What are the features of blockchain?
11. Why is blockchain considered more trustworthy?
12. What are the essential elements of a Blockchain Ecosystem? Explain.
13. Why is Blockchain called robust and durable?
14. Is there a difference between ”Proof of Stake” and ”Proof of Work”?
15. What are some of the popular platforms used for developing blockchain applications?
16. What types of records does blockchain support?
17. Which steps do you follow to determine blockchain development needs?
18. How would you train sales staff on blockchain applications' features?
19. Can you describe the main ways in which you ensure secure digital transactions?
20. Can you describe your most complex blockchain development project?
21. What are block identifiers?
22. How do Merkle trees play an important part in blockchain?
23. Why does a blockchain need tokens to operate?
24. What is the difference between the Bitcoin blockchain and Ethereum blockchain?
25. What are the different types of blockchains?
26. What is the principle on which blockchain technology is based?
27. Name the most widely used cryptographic algorithms.
28. How will you handle risk management related to securing the transaction records?
29. What is a consensus algorithm? What are the different types of consensus algorithms?
30. What language is used for creating smart contracts?
31. What is mining?
32. How does peer discovery work in a P2P network?
33. What is distributed ledger technology?
34. What is the difference between distributed ledger technology and blockchain?
35. How do you stay informed of the latest trends and advancements in your field?

Blockchain Developer Interview Questions and Answers

Every interview is different and the questions may vary. However, there are lots of general questions that get asked at every interview.

Below are some common questions you'd expect during Blockchain Developer interviews. Click on each question to see how to answer them.

1. Why Should We Hire You?
2. What is Your Greatest Weakness?
3. Tell Me About Yourself
4. What is Your Greatest Strength?
5. What Is Your Greatest Accomplishment?
6. What is Your Salary Expectation?
7. Why Do You Want This Job?
8. Are You a Leader or a Follower?
9. Do You Have Any Questions for Us?
10. Why Do You Want To Leave Your Current Job?