Senior QA Engineer (Smart Contract Testing/DEX)

<p data-path-to-node="3">We are seeking a highly technical Senior QA Engineer to spearhead the quality assurance strategy for our client - Decentralized Exchange (DEX). This role focuses on the intersection of traditional exchange mechanics and blockchain technology, requiring a candidate who can perform deep white-box testing on smart contracts while ensuring the reliability of the entire trading lifecycle.</p> <h3 data-path-to-node="4"><strong data-path-to-node="4" data-index-in-node="0">Key Responsibilities</strong></h3> <ul data-path-to-node="5"> <li> <p data-path-to-node="5,0,0"><strong data-path-to-node="5,0,0" data-index-in-node="0">Full-Stack Testing:</strong> Lead end-to-end testing for DEX/CEX platforms, encompassing functional integration, User Acceptance Testing (UAT), performance/stress testing, and security assessments.</p> </li> <li> <p data-path-to-node="5,1,0"><strong data-path-to-node="5,1,0" data-index-in-node="0">Smart Contract White-Box Testing:</strong> Conduct rigorous unit and integration testing for core on-chain components, including <strong data-path-to-node="5,1,0" data-index-in-node="120">Vaults, Clearinghouses, Settlement engines, and Oracles.</strong></p> </li> <li> <p data-path-to-node="5,2,0"><strong data-path-to-node="5,2,0" data-index-in-node="0">Framework Architecture:</strong> Build and maintain scalable automated testing frameworks using industry-standard tools like <strong data-path-to-node="5,2,0" data-index-in-node="116">Hardhat and Foundry</strong>.</p> </li> <li> <p data-path-to-node="5,3,0"><strong data-path-to-node="5,3,0" data-index-in-node="0">Release Management:</strong> Oversee production environment deployment verification, regression testing, and final launch acceptance to ensure zero-defect deployments.</p> </li> <li> <p data-path-to-node="5,4,0"><strong data-path-to-node="5,4,0" data-index-in-node="0">Collaborative Design:</strong> Actively participate in requirements review and test design alongside Developers and Product Managers to bake quality into the development lifecycle.</p> </li> </ul> <h3 data-path-to-node="6"><strong data-path-to-node="6" data-index-in-node="0">Required Qualifications &amp; Skills</strong></h3> <ul data-path-to-node="7"> <li> <p data-path-to-node="7,0,0"><strong data-path-to-node="7,0,0" data-index-in-node="0">Experience:</strong> 8+ years of professional QA experience with a deep understanding of cross-platform testing (PC, H5, and Mobile).</p> </li> <li> <p data-path-to-node="7,1,0"><strong data-path-to-node="7,1,0" data-index-in-node="0">Domain Expertise:</strong> 3+ years of specific experience in Exchange (DEX/CEX) testing, with a thorough grasp of matching engines, clearing/settlement, and asset flow logic.</p> </li> <li> <p data-path-to-node="7,2,0"><strong data-path-to-node="7,2,0" data-index-in-node="0">Blockchain Proficiency:</strong> Mastery of smart contract testing across at least two major ecosystems: <strong data-path-to-node="7,2,0" data-index-in-node="96">EVM (Solidity)</strong>, <strong data-path-to-node="7,2,0" data-index-in-node="112">Sui (Move)</strong>, or <strong data-path-to-node="7,2,0" data-index-in-node="127">Solana (Rust/Anchor)</strong>.</p> </li> <li> <p data-path-to-node="7,3,0"><strong data-path-to-node="7,3,0" data-index-in-node="0">Technical Toolkit:</strong> Proficient in <strong data-path-to-node="7,3,0" data-index-in-node="33">Hardhat, Foundry, or Truffle</strong> for comprehensive white-box testing of contract source code.</p> </li> <li> <p data-path-to-node="7,4,0"><strong data-path-to-node="7,4,0" data-index-in-node="0">Web3 Integration:</strong> Skilled in testing <strong data-path-to-node="7,4,0" data-index-in-node="37">Chainlink Oracle</strong> integrations, <strong data-path-to-node="7,4,0" data-index-in-node="68">WalletConnect</strong>, and <strong data-path-to-node="7,4,0" data-index-in-node="87">Web3 Providers</strong>.</p> </li> <li> <p data-path-to-node="7,5,0"><strong data-path-to-node="7,5,0" data-index-in-node="0">Automation Mastery:</strong> Proven ability to implement end-to-end automation spanning UI, API, and on-chain interactions.</p> </li> <li> <p data-path-to-node="7,6,0"><strong data-path-to-node="7,6,0" data-index-in-node="0">Risk Management:</strong> Familiarity with exchange risk control systems and experience validating complex risk parameters.</p> </li> </ul> <h3 data-path-to-node="8"><strong data-path-to-node="8" data-index-in-node="0">Preferred Attributes (Bonus)</strong></h3> <ul data-path-to-node="9"> <li> <p data-path-to-node="9,0,0"><strong data-path-to-node="9,0,0" data-index-in-node="0">Protocol Knowledge:</strong> Experience testing specific standards and architectures such as <strong data-path-to-node="9,0,0" data-index-in-node="84">ERC-4626 (Yield-bearing vaults)</strong>, <strong data-path-to-node="9,0,0" data-index-in-node="117">ERC-7540/7575</strong>, <strong data-path-to-node="9,0,0" data-index-in-node="132">AMM</strong> (Automated Market Makers), or <strong data-path-to-node="9,0,0" data-index-in-node="166">Order Book</strong> contracts.</p> </li> <li> <p data-path-to-node="9,1,0"><strong data-path-to-node="9,1,0" data-index-in-node="0">Security Mindset:</strong> Familiarity with smart contract security audits and common vulnerabilities (Reentrancy, Arithmetic Overflows, Access Control).</p> </li> <li> <p data-path-to-node="9,2,0"><strong data-path-to-node="9,2,0" data-index-in-node="0">Advanced Methodology:</strong> Experience with <strong data-path-to-node="9,2,0" data-index-in-node="38">Fuzzing</strong> (e.g., Echidna, Foundry invariant testing) or <strong data-path-to-node="9,2,0" data-index-in-node="92">Formal Verification</strong>.</p> </li> </ul>