Blockchain Security / Crypto Custody Engineer

Role Summary: Design, build, and secure institutional-grade digital asset custody platforms. The posting frames this as a hands-on engineering role focused on crypto-native security capabilities and digital asset development, including secure wallet technologies, key management, cryptographic protocols, smart contract security, tokenization, custody policy enforcement, and advanced blockchain security solutions.

Key Responsibilities: Contribute to the design and implementation of secure wallet solutions spanning MPC, HSMs, cold, warm, and hot wallet architectures, and custodial versus non-custodial control models. Implement distributed key generation and signing workflows and ensure secure handling of key lifecycle events such as generation, storage, usage, rotation, and recovery. Design and implement security-critical components using modern cryptographic protocols, DeFi application security principles, and cross-chain and blockchain interoperability patterns. Evaluate and integrate advanced technologies such as zero-knowledge proofs, decentralized identity frameworks, and applicable CBDC architectures. Build and configure programmable custody policy engines with multi-approval workflows, spending thresholds, velocity limits, role-based access controls, and segregation of duties. Work with engineering, cybersecurity, risk, compliance, and audit stakeholders on security reviews, threat modeling, architecture assessments, and incident analysis and remediation. Assess blockchain architectures, smart-contract frameworks, tokenization approaches, and secure bridge or interoperability models for enterprise suitability. Leverage GenAI and agentic AI tools to accelerate threat modeling, cryptographic design reviews, documentation, and validation. Source-Supported Qualification Themes 7+ years of software engineering experience with a strong focus on security or cryptography. Hands-on experience with secure wallet technologies and key management systems such as MPC, HSMs, or equivalent. Strong understanding of cryptographic primitives, secure protocol design, and distributed systems. Experience building systems where security failures have material impact. Ability to collaborate effectively across engineering, security, and risk teams. Strongly preferred: experience with crypto custody platforms, digital assets, or blockchain infrastructure; hands-on work with ZKPs, DID frameworks, DeFi protocols, or CBDC-related systems; and experience implementing policy-driven transaction controls in high-risk systems.