ArtOfBlockChain
ArtOfBlockChain
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  • #A
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    Explanation:
    Miners can adjust timestamps within a reasonable range, enabling subtle manipulation. This can affect auctions, lotteries, and reward systems
  • 5
    Replies
  • Application deadline: 1 month
    C

    Senior Analytics Engineer

    Consensys • FULL_TIME • NA

    Job description
    This role supports Consensys’s Data team, responsible for transforming raw data into reliable, analysis-ready models that power KPIs across Finance, Product, and Leadership. As a Senior Analytics Engineer, you will design, build, document, and maintain data models and semantic layers, while ensuring accuracy, governance, and consistency across the organization. You...
    Details Login to apply
  • Application deadline: 1 month
    C

    Backend Engineer — MetaMask (API Platform)

    Consensus • FULL_TIME • NA

    Job description
    This role supports MetaMask’s API Platform team, which builds backend services powering key product experiences across MetaMask clients. As a Backend Engineer, you will develop Node.js services that support APIs such as Price, Token, Account, and NFT, contributing to reliable and scalable infrastructure used by millions of users. The position...
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  • Application deadline: 1 month
    C

    Release Engineer — MetaMask

    Consensys • FULL_TIME • NA

    Job description
    This role supports MetaMask’s mobile and browser extension teams by ensuring smooth, consistent, and high-quality application releases. As a Release Engineer, you will manage daily release operations, validate builds, automate workflows, and oversee CI/CD pipelines across multiple platforms. The position involves coordinating with engineering, QA, and product teams to maintain...
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  • Application deadline: 1 month
    C

    Senior Solutions Architect

    Chainalysis • FULL_TIME • NA

    Job description
    Chainalysis develops blockchain data tools used by government agencies, financial institutions, and organizations to understand on-chain activity. The Senior Solutions Architect role sits within the Solutions Architecture function and supports the sales cycle by translating customer objectives into technical paths for implementation. This position requires a strong understanding of Chainalysis’...
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  • 14
    Replies
  • Difficulty - Medium
    Total Plays - 7
    Allowed Time - 10 sec
    Best time - 3.010 sec

    5. Why is delegatecall risky?

    Tip: Click "Play" to reveal options and start playing.
    #A
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    Explanation:
    delegatecall executes callee code in the caller’s storage context, leading to storage collisions and privilege escalation. This is a key attack vector in proxy contracts.
  • #A
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    Explanation:
    If the constructor reverts, the entire deployment fails and no contract is created. This prevents partially-initialized smart contracts from being pushed on-chain
  • #A
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    Explanation:
    MSTORE triggers memory expansion when writing to higher memory slots. Memory grows quadratically, so developers must understand how loops and large arrays impact gas.
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  • #A
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    #D
    Explanation:
    EXTCODEHASH returns the hash of a contract’s deployed bytecode, allowing detection of code changes or empty accounts. Auditors use it to verify contract identity and defend against unexpected contract replacement patterns
  • #A
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    #D
    Explanation:
    immutable variables are stored directly in bytecode, not in storage, reducing runtime gas and preventing accidental overwrites. It is a common optimization technique in gas-efficient contract design.
  • Application deadline: 1 month
    L

    Senior SDET

    Ledger • FULL_TIME • NA

    Job description
    Ledger is hiring a Senior SDET to support quality assurance across its digital asset and Web3 product environment by enabling automation, improving testing methodologies, and enhancing CI/CD reliability. This role involves designing automation tools, creating test frameworks, and working closely with product teams to embed test ownership into development workflows....
    Details Login to apply
  • Application deadline: 1 month
    E

    Staff Solana Engineer

    Exodus • FULL_TIME • NA

    Job description
    Exodus is seeking a Staff Solana Engineer to lead and maintain all Solana-related components across its wallet ecosystem. The role focuses on enhancing Solana wallet functionality, refining smart contract support, and delivering stable and optimized integrations for end users. This position requires deep fluency in Solana architecture, with ownership over...
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