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Web3 Developer
The ultimate interview preparation guide for Web3 developers, covering Blockchain Fundamentals, Ethereum, Solidity, Smart Contract Security, and DeFi ecosystems.
570 questionsUpdated 2026-02-08BeginnerIntermediateAdvanced
What you will be asked about
Blockchain FundamentalsEthereum FundamentalsSmart ContractsSmart Contract SecurityWeb3 LibrariesSolidity Development ToolsERC StandardsDeFiNFTs & AppsFrontend IntegrationLayer 2 SolutionsAlternative BlockchainsAdvanced Web3 ConceptsReal-World ScenariosUniswap/DEXOpenSea/NFTAave/CompoundChainlinkMetaMask/WalletsPolygon/L2OpenSea/BlurParadigm/ResearchConsensys/EthereumFireblocks/Custody
How to prepare
- Go through the topic list above and mark every one you cannot explain for five minutes unprepared. Those are your gaps.
- Pair every concept with a story from your own work — interviewers probe depth, and depth comes from having actually done it.
- Do the DSA rounds anyway. Almost every role in this list still screens with coding.
- Prepare two projects you can whiteboard end to end, including what you would change now.
Web3 Developer interview questions570