Senior Security Engineer, Digital Asset Custody

Job Summary We are seeking a Senior Security Engineer Digital Asset Custody to serve as a technical authority for secure custody platforms supporting digital assets. This is a hands-on individual contributor role responsible for designing, implementing, and maintaining key management systems, custody architecture, and enterprise security controls. The ideal candidate will have deep expertise in cryptography, digital asset security, secure key management, and distributed systems. This role will partner closely with engineering, cybersecurity, risk, and leadership teams to build secure, resilient, and scalable custody solutions while driving best practices in security architecture, governance, and operational resilience. Key Responsibilities Design and implement institutional-grade key management systems, including Hardware Security Modules (HSMs), Multi-Party Computation (MPC), and secure key lifecycle management. Develop solutions for secure key generation, storage, rotation, signing, backup, and recovery. Define and evaluate custody architectures across hot, warm, and cold wallet models. Ensure compliance with security, regulatory, governance, and audit requirements. Collaborate with cybersecurity and risk teams to implement zero-trust and defense-in-depth security principles. Lead the design and development of custody policy frameworks governing transaction authorization, approvals, access controls, and operational safeguards. Implement role-based access controls, segregation of duties, transaction limits, exception handling, and policy enforcement mechanisms. Translate business, legal, compliance, and risk requirements into scalable technical controls and automated processes. Serve as a trusted advisor on custody governance, security architecture, and operational risk management. Develop and maintain disaster recovery strategies, including key recovery, quorum loss recovery, and blockchain-related failure scenarios. Create and maintain incident response plans, recovery procedures, and operational runbooks. Partner with Operations, Security, and Site Reliability Engineering teams to improve readiness and resilience. Lead post-incident reviews, root cause analysis, and long-term remediation efforts. Serve as the technical authority for custody architecture across wallets, blockchain networks, and digital asset platforms. Identify security and operational risks early and define effective mitigation strategies. Ensure custody solutions scale securely across multiple assets, blockchain networks, and tokenized products. Drive continuous improvements in security, resiliency, observability, and engineering practices. Leverage modern engineering practices and AI-assisted tools to enhance threat modeling, architecture design, software development, testing, validation, and documentation. Promote secure and responsible use of AI-enabled engineering practices. Required Qualifications 10+ years of software engineering experience with a focus on security, cryptography, distributed systems, or other high-risk environments. Hands-on experience designing and implementing secure key management systems. Experience working with Hardware Security Modules (HSMs) and Multi-Party Computation (MPC) frameworks. Strong understanding of cryptographic principles and secure key lifecycle management. Experience with Web3 security tools such as Slither, Mythril, Foundry Fuzzing, or similar technologies. Proficiency in one or more systems programming languages, including C, C++, Rust, or Go. Strong understanding of distributed systems architecture, fault tolerance, and secure system design. Experience collaborating with internal or external security audit teams. Proven ability to operate as a senior technical leader and make architecture decisions in complex environments. Strong analytical, troubleshooting, and problem-solving skills. Excellent communication and stakeholder management abilities. Preferred Qualifications Experience with digital asset custody platforms, blockchain infrastructure, or cryptocurrency ecosystems. Experience designing and supporting blockchain-based security architectures. Ownership of incident response programs, disaster recovery planning, or security operations runbooks. Experience communicating risk-based decisions to both technical and business stakeholders. Strong understanding of governance, risk management, and operational controls. Experience leveraging AI tools within software engineering, security, or architecture workflows. Experience supporting tokenized assets, multi-chain environments, or enterprise blockchain platforms. Primary Skills Digital Asset Custody Security Hardware Security Modules (HSM) Multi-Party Computation (MPC) Cryptography and Secure Key Management Blockchain and Web3 Security Custody Architecture and Governance Distributed Systems and Fault-Tolerant Design C, C++, Rust, or Go Incident Response and Disaster Recovery Risk Management and Security Architecture Zero Trust Security Principles AI-Assisted Engineering and Threat Modeling Location Requirement Must be able to work onsite four days per week in Southlake, TX or Austin, TX from the start of the engagement. Education: Bachelors Degree