Senior QA Engineer (Smart Contract Testing/DEX)

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.

Key Responsibilities**

Full-Stack Testing:** Lead end-to-end testing for DEX/CEX platforms, encompassing functional integration, User Acceptance Testing (UAT), performance/stress testing, and security assessments.

Smart Contract White-Box Testing:Conduct rigorous unit and integration testing for core on-chain components, including Vaults, Clearinghouses, Settlement engines, and Oracles.

Framework Architecture:Build and maintain scalable automated testing frameworks using industry-standard tools like Hardhat and Foundry.

Release Management:** Oversee production environment deployment verification, regression testing, and final launch acceptance to ensure zero-defect deployments.

Collaborative Design:** Actively participate in requirements review and test design alongside Developers and Product Managers to bake quality into the development lifecycle.

Required Qualifications & Skills**

Experience:** 8+ years of professional QA experience with a deep understanding of cross-platform testing (PC, H5, and Mobile).

Domain Expertise:** 3+ years of specific experience in Exchange (DEX/CEX) testing, with a thorough grasp of matching engines, clearing/settlement, and asset flow logic.

Blockchain Proficiency:Mastery of smart contract testing across at least two major ecosystems: EVM (Solidity), Sui (Move), or Solana (Rust/Anchor).

Technical Toolkit:Proficient in Hardhat, Foundry, or Truffle for comprehensive white-box testing of contract source code.

Web3 Integration:Skilled in testing Chainlink Oracle integrations, WalletConnect**, and Web3 Providers**.

Automation Mastery:** Proven ability to implement end-to-end automation spanning UI, API, and on-chain interactions.

Risk Management:** Familiarity with exchange risk control systems and experience validating complex risk parameters.

Preferred Attributes (Bonus)**

Protocol Knowledge:Experience testing specific standards and architectures such as ERC-4626 (Yield-bearing vaults), ERC-7540/7575**, AMM** (Automated Market Makers), or Order Book** contracts.

Security Mindset:** Familiarity with smart contract security audits and common vulnerabilities (Reentrancy, Arithmetic Overflows, Access Control).

Advanced Methodology:Experience with Fuzzing (e.g., Echidna, Foundry invariant testing) or Formal Verification**.