Senior Security Engineer Digital Asset Custody / Crypto Security Engineer

Senior Security Engineer Digital Asset Custody / Crypto Security Engineer
Location: Austin-TX, Southlake-TX, San Fransico CA, Denver, CO (Hybrid 3-4 Days)
Contract

Mandatory Skills : IPFS, Laravel, Node.js, Python, Ripple

Required Qualifications
10 years of software engineering experience with deep specialization in security sensitive or cryptographic systems
Strong hands on experience with HSMs MPC frameworks and secure key management systems
Experience with Web3 Security tooling such as Slither Mythril Foundry Fuzzing
Experience with common cryptography implementation languages such as C C Rust Go
Experience with collaborating with security auditors Ex Trail of bits halborn
Proven ability to design systems where failure has material risk implications
Strong grounding in distributed systems secure architectures and fault tolerant design
Track record of acting as a technical authority without formal people management

Strongly Preferred
Experience with crypto custody digital asset platforms or blockchain infrastructure
Prior ownership of incident response DR design or security runbooks
Ability to articulate risk based trade offs clearly to technical and non technical stakeholders
Systems thinker who connects technology security policy and operations
Comfortable challenging assumptions and raising concerns early in high stakes environments
Experience applying AI tools to complex engineering workflows
What Success Looks Like
Custody key management and policy systems are secure resilient auditable and trusted
Failure modes are well understood modeled and operationally prepared for
Incidents are handled with clarity speed

What This Engineer Will Do
Custody Key Management Cryptographic Architecture
Design implement and evolve institutional grade key management architectures including
Hardware Security Modules HSMs
Multi Party Computation MPC
Secure key generation storage rotation signing and recovery
Define clear trade offs and architectural patterns across hot wallet warm wallet and cold storage models
Ensure cryptographic designs align with regulatory security and audit expectations
Partner closely with Cybersecurity and Risk to embed defense in depth and zero trust principles into custody design
Custody Policy Engine Governance
Lead the design of the Custody Policy Engine governing
Authorization approvals limits and segregation of duties
Transaction controls and exception handling
Policy versioning auditability and enforceability
Ensure policies are code driven deterministic observable and testable
Translate business legal and risk requirements into clear enforceable technical controls
Serve as a trusted technical advisor on custody governance topics
Disaster Recovery Resilience Incident Ownership
Own custody specific disaster recovery strategies including key recovery quorum loss scenarios and chain events
Author and maintain incident response and recovery runbooks for custody related failures or security events
Partner with Operations Security and SRE to ensure practicable tested recovery procedures
Lead post incident technical analysis root cause reviews and long term remediation strategies
Overall Custody Architecture Risk Posture
Act as the custody architecture authority ensuring consistency across wallets blockchains environments and platforms
Identify architectural and operational risks early propose mitigation strategies with clear trade offs
Ensure custody designs scale across assets chains and future tokenized products
Influence enterprise standards by raising the bar on security resilience and technical rigor
AI Augmented Engineering Excellence
Leverage GenAI and agentic AI tools to accelerate architecture design threat modeling documentation testing and reviews
Set expectations for AI assisted engineering rigorspeed with correctness not shortcuts
Partner with engineering teams to raise architecture code and documentation quality across custody components