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  • Application deadline: 4 days
    Job description
    Exegy is hiring a Security Engineer focused on Attack Surface Management to own and mature its vulnerability management program. This role is responsible for reducing real organizational risk by identifying, prioritizing, and driving remediation of exploitable vulnerabilities across endpoints, servers, cloud workloads, SaaS platforms, and internet-facing systems. The position emphasizes...
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    Explanation:
    Participating in open audit contests on platforms like Code4rena builds verified proof and community trust.
  • Application deadline: 2 days
    C

    Research Engineer

    Chainlink LabsFULL_TIMENA

    Job description
    Chainlink Labs develops decentralized oracle infrastructure used across decentralized finance and institutional blockchain applications. The organization focuses on data delivery, interoperability, compliance, and privacy standards that support production-grade smart contract systems.The Research Engineer role sits within the research organization and works closely with core engineering, research scientists, and technical advisors....
  • Application deadline: 2 weeks
    Job description
    This full-time role contributes to CertiK’s blockchain security services across smart contract auditing, security reviews, and broader cybersecurity work. The position focuses on identifying and analyzing vulnerabilities in blockchain systems, documenting attack patterns, and supporting the development of tools for feature-based code analysis. The role operates at the intersection of...
  • Difficulty - Medium
    Total Plays - 12
    Allowed Time - 10 sec
    Best time - 1.483 sec

    What does delegatecall do?

    Tip: Click "Play" to reveal options and start playing.
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    Explanation:
    delegatecall lets one contract run another’s code while keeping its own storage and balance. It’s powerful but risky — if the target contract has malicious logic, it can overwrite your state variables or drain funds. Auditors always flag unsafe delegatecalls
  • Application deadline: 1 month

    Data Analyst

    ConsensysFULL_TIMENA

    Job description
    Consensys is hiring a Data Analyst to work closely with MetaMask product teams and support data-driven decisions across a broad ecosystem of Web3 tools, including Infura, Linea, Diligence, and Phosphor. The role sits within the Data team under the Office of the COO and focuses on generating insights from complex...
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  • Application deadline: 1 month
    C

    Smart Contract Engineer

    ClearmaticsFULL_TIMENA

    Job description
    Clearmatics builds decentralized financial market infrastructure designed to enable open, efficient, and interoperable markets. The company focuses on systems that allow peer-to-peer trading, settlement, and the creation of markets around real-world risk factors not well represented in traditional finance. As a Smart Contract Engineer, you will develop and maintain Solidity-based...
  • Application deadline: 1 month

    Smart Contract Engineer

    Aragon FULL_TIMENA

    Job description
    This role is part of Aragon’s Solutions team, which builds custom integrations on top of Aragon OSx, the company’s modular framework for onchain organizations. The position focuses on translating client requirements into secure smart contract architectures and delivering end-to-end implementations that align with user needs. The engineer works closely with...
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    Explanation:
    Invariants are rules that must always remain true in a contract. Documenting them helps validate whether your core logic stays consistent after every transaction.
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