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Feb 2025

How to answer this Technical interview question about for Web3 Front-End Engineer?

How do you debug and test smart contract interactions in a Web3 front-end application?

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Web3 Front-End Engineer

Technical

Asked at

Uniswap Labs

Difficulty :

Hard

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Explanation

This question evaluates your ability to debug and test interactions between the front end and smart contracts. Recruiters are looking for candidates who can use tools like Hardhat, Truffle, and testnets to ensure error-free contract interactions. A strong answer will include examples of debugging techniques and testing frameworks. Avoid failing to address edge cases and test coverage.

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Answer Example

I debug and test smart contract interactions by using tools like Hardhat or Truffle to simulate blockchain environments. For example, I deployed a smart contract on a local testnet and used Hardhat's console to inspect function calls and responses. I also wrote Jest tests to validate front-end interactions, ensuring edge cases like failed transactions were handled gracefully. This systematic approach ensures reliable and secure contract integration.

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