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Feb 2025

How to answer this Technical interview question about Gas Fees and Confirmations for Senior-Level Web3 Front-End Engineer?

How do you handle gas fees and transaction confirmations on the front end of a Web3 app?

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Web3 Front-End Engineer

Technical

Asked at

Chainlink Labs

Difficulty :

Hard

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Explanation

This question assesses your understanding of handling blockchain-specific challenges like gas fees and transaction confirmations in a Web3 application. Recruiters are looking for candidates who can display real-time gas fee estimates and provide users with confirmation updates. A strong answer will include examples of tools used to estimate gas fees and UX strategies for transaction feedback. Avoid failing to address network congestion and failed transactions.

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Answer Example

I handle gas fees by using APIs like Etherscan or Gas Station Network to fetch real-time gas price data and display estimates to users during transactions. For example, I implemented a slider to allow users to choose between faster or cheaper transactions. I also built a transaction status tracker that provides updates on pending, confirmed, or failed transactions, ensuring transparency and better user experience.

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