Blockchain QA Engineer (Hybrid NYC)

Blockchain QA Engineer (Hybrid)Location: NYC** Must be located and authorized to work here in the US, without sponsorship or transfer needed in the future. No C2C inquires, please. **Our client is a leading innovator in the blockchain space, building core infrastructure for decentralized networks. Their work powers a wide range of next-generation financial applications, using advanced protocol-level engineering to enable secure, scalable, and efficient blockchain solutions. With a focus on performance and reliability, they are helping to shape the future of decentralized finance and the broader crypto ecosystem.They are looking for a Blockchain QA Engineer with a strong background in protocol testing within blockchain or crypto environments. In this role, you’ll be directly responsible for validating core blockchain protocols through automation and manual testing, ensuring reliability, security, and performance. You’ll work with a collaborative team of protocol engineers, QA specialists, and DevOps to design and execute tests for consensus mechanisms, staking logic, governance modules, and more. A solid understanding of chain-level architecture, especially in environments like Cosmos SDK or other L1/L2 frameworks, is essential.Requirements:4+ years of QA or SDET experience, ideally with a systems or infrastructure focus2+ years in blockchain or crypto protocol testing (e.g., Cosmos SDK, Substrate, Ethereum)Proficiency in Go and Python, with the ability to read and debug protocol codeExperience validating systems via CLI, RPC interfaces, and transaction flowsUnderstanding of consensus algorithms, staking, validators, and decentralized governanceStrong risk-based testing approach with a focus on edge cases and systemic reliabilityIndependent, proactive mindset with strong communication and documentation skillsResponsibilities:Design and implement test plans for protocol-level upgrades, new modules, and consensus changesRead and debug core blockchain code to surface and diagnose issuesBuild and maintain Python-based automation for protocol validationConduct regression, performance, and fault-injection testing on the blockchain networkCollaborate with engineering and DevOps to ensure robust release practicesValidate protocol interactions across CLI tools, RPC endpoints, and transaction workflowsDocument test coverage, defects, and QA outcomes in a clear and maintainable wayRepresent QA in planning, retrospectives, and deployment readiness discussionsThis is a full-time, remote position based in NYC, offering competitive salary, equity participation, and a comprehensive benefits package. The team promotes a culture of technical excellence, autonomy, and innovation, making it an ideal environment for engineers passionate about blockchain protocols and decentralized systems.