Senior Security Engineer - xStocks

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Description

Accountabilities - Lead security initiatives: Own security deliverables from assessment through remediation, including coordinating smart contract audits, responding to security questionnaires, supporting due diligence, and collaborating with security leadership and compliance teams. - Conduct offensive security assessments: Perform penetration testing across web applications, APIs, backend services, and blockchain components. Develop repeatable tools and processes to identify vulnerabilities continuously. - Manage security risks: Conduct threat modeling for new and existing systems, review architecture and key-management processes, and maintain clear documentation of identified risks, mitigation strategies, and remediation progress. - Review code and architecture: Act as a security-focused reviewer for changes involving authentication, authorization, cryptography, custody, transaction signing, and the movement of funds across supported blockchain networks. - Strengthen platform security: Improve secrets management, identity and access management, least-privilege controls, dependency security, software supply-chain protection, monitoring, and security event logging. - Secure custody and transaction signing: Assess and harden signing workflows, multi-party computation (MPC) and hardware security module (HSM) integrations, signer permissions, administrative access, approval policies, and emergency access procedures. - Contribute to product engineering: Work directly with the en

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