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  • Hey all,

    I’m a cryptography expert with 2 years of experience in DeFi protocols. I’ve got an interview lined up for a project that’s developing a blockchain-based voting system. While I’m confident with cryptography, smart contracts, and blockchain in general, I haven’t worked specifically on voting systems before.

    For anyone who’s worked on blockchain-based voting or similar projects, what kind of questions did you get in your interviews? Are there any particular topics I should focus on, like cryptography, security, or consensus mechanisms? I’d appreciate any tips on how to prepare for the technical rounds!

    Thanks in advance!

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  • Andria Shines

    Member • 1mo

    Blockchain-based voting systems demand robust cryptographic knowledge, strong security frameworks, and expertise in consensus mechanisms. Interview questions often focus on both foundational concepts and practical problem-solving. Here’s what you can prepare for:

    First Round: Core Technical Questions

    1. Cryptographic Basics: Be ready to discuss hashing algorithms (e.g., SHA-256, Keccak), public-key cryptography, and digital signatures (e.g., ECDSA).
    2. Privacy Techniques: Expect questions on zero-knowledge proofs or homomorphic encryption, which are essential for preserving voter anonymity and secure vote tallying.
    3. Consensus Mechanisms: Demonstrate your understanding of PoW, PoS, or PBFT and their trade-offs, especially in terms of scalability and security for voting systems.

    Second Round: Practical and Scenario-Based Questions

    1. System Design: They might ask you to design a secure architecture for storing votes on-chain or integrating off-chain systems via oracles. Highlight how you'd ensure transparency and immutability.
    2. Mitigation Strategies: Expect discussions on attack vectors like Sybil attacks, bribery, or collusion. Explain countermeasures, such as identity verification through zk-SNARKs or multi-party computation.
    3. Smart Contracts: Prepare to explain how smart contracts can automate processes like vote validation or dispute resolution.

    Additional Topics

    1. Data Integrity: Discuss the use of Merkle trees for verifying data consistency and immutability.
    2. Real-World Examples: If you’ve worked on DAO governance or token-based voting, share insights into implementation challenges and solutions.

    How would you approach balancing voter anonymity with verifiability in a blockchain-based voting system while ensuring scalability?

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