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ArtOfBlockChain

  • How to Prepare for Blockchain Layer 2 System Design Interviews: Rollups, Sidechains, Security

    Santos P

    Member

    Updated: Jun 16, 2025
    Views: 52

    Hey everyone, I’m prepping for a blockchain system design interview focused on Layer 2 solutions.
    I’m pretty comfortable with rollups and sidechains in theory, but security differences still trip me up. I’m a senior software engineer with blockchain experience, mostly in JavaScript, Python, and Solidity.
    I’ve worked on DeFi projects, but I haven’t actually built a Layer 2 solution from scratch.
    What practical resources or tips do you recommend for understanding rollup vs sidechain security?
    How do you usually explain these concepts clearly during interviews?
    I’m aiming for a blockchain architect role focused on scalable infrastructure—any advice is super helpful!

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  • Alex Dowling

    Member • 6d

    When I interview for Layer 2 roles, I look for candidates who can clearly explain the security trade-offs between rollups and sidechains. I recommend focusing on real-world examples—like why a DeFi protocol might prefer a rollup for security and a sidechain for flexibility. Prepare to discuss the risks of each approach and how you’d mitigate them. Practice explaining technical concepts in simple terms for non-technical stakeholders, as this is crucial for architect roles. Also, keep up with the latest Layer 2 trends and case studies as interviewers appreciate candidates who are informed about current industry developments.

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