How to Prepare for Live Coding Interviews as a Junior Blockchain Engineer

Absolutely, here’s some advice that’s helped me and others get through blockchain live coding interviews.

Really focus on practicing smart contract coding tests and debugging in a timed setting—set a stopwatch and try to solve real Solidity problems, like writing token transfers or access control logic.

Interviewers almost always want you to talk through your thinking, so get comfortable explaining as you code.

Don’t forget to check your work with edge cases, and use Hardhat or Remix for quick testing. Time management is huge, so practice solving problems fast but accurately.

Also, brush up on security best practices and gas optimization since those questions come up a lot in Web3 technical interviews. If you hit a bug, don’t panic—just show how you’d debug it.

The more you practice, the more confident you’ll feel when it’s time for the real thing. Good luck!

From my experience, the way you approach problems matters more than just writing code. When you get a smart contract challenge, always clarify the requirements first—this shows you’re thorough and easy to work with. Break the problem into smaller steps before diving into Solidity. Sketching out your logic or writing pseudo-code can help keep you organized during Web3 technical interviews.

Interviewers really value clear communication and curiosity. If you’re unsure about something, ask questions instead of guessing. For example, if the prompt is about token transfers, check if you need to handle edge cases like zero transfers or invalid recipients. Use familiar tools like Remix or Hardhat, but don’t stress about remembering every detail. If you make a mistake, own it and explain how you’d fix it.

Practicing explaining your code as if you’re teaching someone helps you stay calm and shows your understanding. Most interviewers care more about how you handle pressure and adapt than about perfect code. Good luck with your smart contract coding test!

Jumping in—with regular code reviews and real audit reports, I found my technical communication skills improved as much as my blockchain knowledge. I started noticing that writing out why a line of code needed improvement made it easier to spot red flags and avoid common security pitfalls in interviews.

For anyone who’s made this leap, which types of interview questions started to feel easier after consistently reviewing open-source pull requests? Did anyone discover unexpected blindspots or strengths through this hands-on approach?

Also, has anyone tried recording themselves explaining a tricky smart contract bug or a performance optimization? I noticed that hearing my explanations back helped tighten up my thinking and boosted confidence in live interviews.

Curious if that’s worked for others, or if there are other rehearsal methods that really moved the needle for your blockchain interview prep.