Freshers (0–2 years)

Blockchain Interview Questions for Freshers

Preparing for your first Blockchain interviews? This set is curated for freshers and early-career developers (0–2 years): the 27 questions that come up most for entry-level roles, each with a clear answer, example code and follow-ups.

27Questions14Beginner13Intermediate

27 Blockchain questions

  1. 1What is Sharding in the context of Blockchain scalability?Intermediate
  2. 2What is a Hard Fork vs a Soft Fork?Intermediate
  3. 3Explain 51% Attacks.Intermediate
  4. 4How do Oracles work in Blockchain?Intermediate
  5. 5What is a Reentrancy Attack in Smart Contracts?Intermediate
  6. 6Explain the concept of a Merkle Tree.Intermediate
  7. 7What are ERC-20 and ERC-721 standards?Intermediate
  8. 8What is Gas in Ethereum and how is it calculated?Intermediate
  9. 9Explain the Ethereum Virtual Machine (EVM).Intermediate
  10. 10How does Proof of Work (PoW) differ from Proof of Stake (PoS)?Intermediate
  11. 11What is a Wallet and how do Private Keys work?Beginner
  12. 12What is the role of a Node in a Blockchain network?Beginner
  13. 13What are Distributed Ledger Technologies (DLT)?Beginner
  14. 14What is a Digital Signature and why is it used?Beginner
  15. 15Explain the concept of Immutability in Blockchain.Beginner
  16. 16What is a Genesis Block?Beginner
  17. 17What is the difference between Public and Private Blockchains?Beginner
  18. 18What is a Smart Contract?Beginner
  19. 19Explain the concept of Hashing in Blockchain.Beginner
  20. 20What is a Blockchain and how does it differ from a traditional database?Beginner
  21. 21What is Double Spending in Blockchain?Intermediate
  22. 22What is Blockchain?Beginner
  23. 23What is Blockchain Consensus?Beginner
  24. 24What is the difference between Proof of Work (PoW) and Proof of Stake (PoS)?Intermediate
  25. 25Blockchain Advanced Interview Question 10Beginner
  26. 26Blockchain Advanced Interview Question 8Intermediate
  27. 27Blockchain Advanced Interview Question 7Beginner

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Frequently asked questions

Which Blockchain questions do freshers (0–2 years) get asked?

This page collects 27 Blockchain interview questions aligned with freshers (0–2 years), ranging across the difficulty levels that match that experience band.

How do I prepare for a Blockchain interview with my experience level?

Work through these questions in order, make sure you can explain each answer out loud, and pay attention to the real-world examples and follow-ups — interviewers at this level care as much about reasoning as the final answer.

Do the answers include code and examples?

Yes — answers include explanations, code examples where relevant, common mistakes to avoid and follow-up questions so you are ready for the full interview conversation.