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Smart Contract Developer Interview Questions

Basic Concepts

  1. What is a smart contract, and how does it function?

    • Hint: Discuss self-executing contracts on blockchain and their automation capabilities.

  2. Can you describe the Ethereum Virtual Machine (EVM) and its role?

    • Hint: Explain its function in executing smart contracts on the Ethereum network.

  3. What are some common use cases for smart contracts?

    • Hint: Mention applications in finance, supply chain, gaming, etc., where trustless automation is beneficial.

  4. What is the difference between ERC-20 and ERC-721 tokens?

    • Hint: Highlight fungibility vs. non-fungibility and their respective applications.

  5. How do you deploy a smart contract on the Ethereum network?

    • Hint: Discuss steps like writing, compiling with Solidity, and deploying using tools like Remix or Truffle.

  6. What are some best practices for writing secure smart contracts?

    • Hint: Include practices like input validation, avoiding reentrancy vulnerabilities, and thorough testing.

  7. What tools and environments do you use for smart contract development?

    • Hint: Mention IDEs like Remix, development frameworks like Truffle, and test networks like Rinkeby.

  8. Explain the concept of gas and how to optimize it.

    • Hint: Discuss gas as a transaction fee in Ethereum and optimizing contracts to reduce costs.

  9. What is the purpose of the fallback function in Solidity?

    • Hint: Explain its role in handling Ether transactions that don’t match any other function signatures.

  10. How do you handle updates and migrations for smart contracts?

    • Hint: Discuss upgradeable contracts using patterns like proxy contracts or state migration.

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