Smart Contract Interview Prep Hub
complete hub for technical + behavioral interview questions, signals founders look for, gas optimization discussions, debugging logic, security fundamentals, and “how to think on your feet” in smart contract interviews.
All threads here help you answer real-world Web3 interview questions confidently — not memorized, but with clarity, reasoning, and practical understanding.
1. Core Interview Questions (EVM, Concepts, Fundamentals)
Can anyone suggest interview questions about EVM?
https://artofblockchain.club/discussion/can-anyone-suggest-interview-questions-about-evm
How do you answer “Where do you see blockchain in 5 years”?
https://artofblockchain.club/discussion/how-do-you-answer-where-do-you-see-blockchain-in-5-years
How to explain reentrancy in interviews without sounding memorized?
https://artofblockchain.club/discussion/how-do-you-explain-reentrancy-in-interviews-without-sounding-like-you-memorized
What’s the EVM? (Quiz)
https://artofblockchain.club/quiz/what-is-the-evm
2. Gas Optimization Questions (Most Asked in Interviews)
Gas optimization panic — how much should juniors care?
Gas pitfalls juniors mention — what interviewers actually assess
https://artofblockchain.club/discussion/gas-pitfalls-juniors-mention-what-interviewers-actually-assess
Which gas pattern reduces redundant SSTOREs? (Quiz)
https://artofblockchain.club/quiz/which-gas-pattern-reduces-redundant-sstores
These help during:
Optimization rounds
System design in Solidity
“Walk me through a gas-saving improvement” questions
3. Debugging & Live Problem-Solving (Very Common Interview Round)
Struggling with Hardhat debugging — missing something beyond console.log?
https://artofblockchain.club/discussion/need-help-hardhat-debugging-mistakes-juniors-repeat-logs-vs-state-assumptions
Hardhat debugging mistakes juniors repeat
https://artofblockchain.club/discussion/need-help-hardhat-debugging-mistakes-juniors-repeat-logs-vs-state-assumptions
Why does this contract pass on testnet but fail on mainnet? (Quiz)
👉https://artofblockchain.club/quiz/why-might-a-contract-work-on-testnet-but-fail-on-mainnet
When tests pass locally but fail on mainnet — what’s happening?
👉 https://artofblockchain.club/discussion/when-blockchain-qa-tests-pass-locally-but-fail-on-mainnet-whats
Interviewers LOVE these because they reveal:
How you think
How you debug
Whether you understand state vs logs
Whether you know mainnet realism vs testnet assumptions
4. Security Questions (CEI, Audit Readiness, Attack Surfaces)
CEI rule in interviews — when do you break it?
https://artofblockchain.club/discussion/cei-rule-in-interviews-when-do-you-actually-break-it-without
Threat modeling for juniors — assumptions before they break
👉 https://artofblockchain.club/discussion/threat-modeling-for-juniors-do-you-test-assumptions-before-they-break
Which Solidity feature is riskiest with delegatecall? (Quiz)
https://artofblockchain.club/quiz/which-solidity-feature-is-riskiest-if-misused-with-delegatecall
Interviewers frequently ask these to check if you can:
Identify risk
Explain vulnerabilities
Think like an auditor
Balance trade-offs under constraints
5. Behavioral / Communication Rounds (Founder + PM Rounds)
Live PR review nerves — do seniors judge beginners too harshly?
Do seniors judge too harshly in blockchain code reviews?
https://artofblockchain.club/discussion/do-seniors-judge-too-harshly-in-blockchain-code-reviews
Handling production incidents as junior Solidity engineer — how to communicate?
https://artofblockchain.club/discussion/handling-production-incidents-as-a-junior-solidity-engineer-how-do-you
Smart contract demo fails mid–client call — how do you respond?
https://artofblockchain.club/discussion/when-a-smart-contract-demo-fails-mid-client-call-how-do-you-communicate
6. Research, Design & Future Vision Rounds
Zero-knowledge proofs — the future of privacy?
https://artofblockchain.club/discussion/zero-knowledge-proofs-the-future-of-privacy-in-blockchain
What blockchain job roles are hot for business analysts?
These allow you to show:
Macro-level understanding
Thoughtfulness
Curiosity
Industry awareness
Interviewers love depth here.
7. Interview Prep Quizzes (Quick Practice Before Rounds)
When does a fallback function trigger?
https://artofblockchain.club/quiz/when-does-a-fallback-trigger
What does MEV stand for?
👉 https://artofblockchain.club/quiz/what-does-mev-stand-for-in-ethereum
Which consensus offers fastest finality?
https://artofblockchain.club/quiz/which-consensus-offers-fastest-finality