Preparing First Blockchain Dev Interview – Any Tips?

Varun Mehta · 2024-08-05T13:48:03+00:00

Hey fellow devs! 👋 Long-time lurker, first-time poster here. So… I’ve got my first blockchain dev interview next week, and I’m equal parts hyped and sweating bullets. 😅 Quick background: CS grad here, been doing Python stuff for a year, but blockchain’s been living rent-free in my head lately—smart contracts, DeFi, all of it. Now I’m trying to pivot into this space, but man, interviews feel like a whole new beast.Any of you been in my shoes? Specifically:What coding challenges did they hit you with? (I’ve been grinding through Solidity tutorials, but am I gonna get rekt by something obscure?)Did they focus more on crypto math/structure or real-world dev stuff?Any “oh crap” moments you didn’t see coming?For context, I’ve built a couple of basic dApps (Rinkeby testnet forever 🙃), but I’m low-key terrified of whiteboard coding for something as niche as consensus algorithms.Shower me with your wisdom! Even a vague hint like “brush up on Merkle trees” or “they grilled me on gas optimization” would save my sanity. Bonus points if you’ve got interview war stories—good, bad, or ”why did I think SHA-256 worked that way” cringe.Thanks, y’all. If this goes well, I owe you a coffee ☕… or at least an upvote. 🚀

Preparing First Blockchain Dev Interview – Any Tips?

Varun Mehta

Member

Updated: Mar 16, 2025

Views: 624
Hey fellow devs! 👋 Long-time lurker, first-time poster here. So… I’ve got my first blockchain dev interview next week, and I’m equal parts hyped and sweating bullets. 😅 Quick background: CS grad here, been doing Python stuff for a year, but blockchain’s been living rent-free in my head lately—smart contracts, DeFi, all of it. Now I’m trying to pivot into this space, but man, interviews feel like a whole new beast.
Any of you been in my shoes? Specifically:
- What coding challenges did they hit you with? (I’ve been grinding through Solidity tutorials, but am I gonna get rekt by something obscure?)
- Did they focus more on crypto math/structure or real-world dev stuff?
- Any “oh crap” moments you didn’t see coming?
For context, I’ve built a couple of basic dApps (Rinkeby testnet forever 🙃), but I’m low-key terrified of whiteboard coding for something as niche as consensus algorithms.
Shower me with your wisdom! Even a vague hint like “brush up on Merkle trees” or “they grilled me on gas optimization” would save my sanity. Bonus points if you’ve got interview war stories—good, bad, or ”why did I think SHA-256 worked that way” cringe.
Thanks, y’all. If this goes well, I owe you a coffee ☕… or at least an upvote. 🚀
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Shubhada Pande

Community Administrator • 8mos

When preparing for a Blockchain Developer interview, it's essential to shift your focus beyond just smart contract specifics. Expect to be questioned on broader topics such as consensus algorithms and network-related issues. For positions centered around smart contracts, the emphasis often lies on your project experience, particularly with DeFi economic models like Compound and Uniswap (V1/V2/V3). Gas optimization and a deep understanding of the Ethereum Virtual Machine (EVM) are also critical.

To get ready, delve into the intricacies of gas optimization. You should be able to discuss various aspects of the EVM, such as storage and calling procedures, in detail. It’s also a good idea to familiarize yourself with Uniswap models, especially V1 and V2. Demonstrating a thorough understanding of these models can set you apart from other candidates.

Think of your interview as an opportunity to showcase your comprehensive knowledge and practical experience. When asked about gas optimization, explain not just what it is, but how you’ve effectively implemented it in your projects. For Uniswap models, highlight specific scenarios where you’ve utilized them and the impact they had on your project outcomes.

By focusing on these key areas and articulating your experience clearly, you’ll be well-prepared to impress your interviewers and stand out as a strong candidate for the Blockchain Developer role.

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David Lee

Member • 1mo

First off, congrats on pivoting to blockchain—it’s a wild but rewarding space. I’ve been in the trenches for 4+ years (Solidity, Ethereum, now dabbling in Cosmos), and here’s my take:

Coding questions often blend smart contract logic with security. Expect to write/modify Solidity snippets (e.g., reentrancy guards, ERC20/721 implementations) or debug vulnerabilities. One interview had me optimize gas costs for a DEX swap—yep, it got spicy.

Curveballs? They might ask you to sketch a Merkle proof on a whiteboard (happened to me!) or explain consensus mechanisms beyond PoW/PoS (Avalanche’s Snowman, anyone?).

Pro tips:

Build in public. Tinker with testnets—deploy a barebones DAO or NFT minter. Even half-baked projects show initiative.

Security first. Memorize common attack vectors (frontrunning, overflow/underflow). I once blanked on a sandwich attack question—still haunts me. 😅

Stay curious. Follow ETHResearch, read audits (OpenZeppelin’s GitHub is gold).

You’ve got this! Feel free to DM if you want to deep-dive. And hey—if they ask about Vitalik’s latest tweet, just nod and smile. 🚀

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