Principal Security Engineer; Crypto​/Digital Assets

We are looking for a Principal Security Engineer with deep crypto domain expertise to lead security across our regulated digital-asset business. As we build out spot trading, custody, staking and on-chain services for our client base, security is the foundation the whole business stands on. This role owns it.

You will be the security owner for our crypto platform's custody and on-chain layer end to end: architecture, engineering, operations and regulatory assurance for the parts of the stack that are unique to digital assets. For platform capabilities already owned by central security teams (cloud, application security, IAM, SOC), you'll define the crypto-specific requirements and partner on delivery rather than duplicate ownership.

You will work closely with risk, compliance, product and engineering, and report into the central security function.

This is a hands-on senior role for someone who understands that in digital-asset custody, a single key-management failure is a firm-ending event, and who builds controls accordingly.

• Own the full custody stack: MPC key management, transaction authorisation, signing quorums, address whitelisting and withdrawal controls
• Govern hot/cold wallet segregation, key ceremonies and delegated cold custodians
• Secure staking architecture and on-chain deposit/withdrawal paths

• Define crypto-specific hardening requirements for the custody and exchange stack within the existing multi-account AWS environment; partner with Infra Sec on account segmentation, network and data-residency controls
• Partner with App Sec to embed crypto-specific checks into the SDLC (SAST, DAST, SCA, CI/CD security gates) for custody and exchange services
• Partner with IAM and IAM Tech on privileged access and secrets governance for crypto signing keys and custody credentials

• Define custody- and blockchain-specific detection use cases and feed them into SOC's monitoring and alerting
• Own incident response for crypto-specific scenarios (key compromise, unauthorised transaction, on-chain incident); partner with Corp Sec on the group-wide IR process, forensics and breach notification
• Contribute custody- and blockchain-specific scenarios into App Sec's pentest and red-team programme

• Own security assessment and ongoing assurance of the crypto vendor stack: custody platforms, execution systems, blockchain analytics, Travel Rule and treasury tooling
• Apply Corp Sec's vendor onboarding and contract security process to crypto vendor engagements

• Own control mapping against MiCA and the crypto-specific provisions of DORA and FCA rules; partner with IT Governance on ISO 27001, SOC 2, NIST CSF and GDPR mapping
• Feed crypto services into the group's BC/DR and important-business-service mapping owned by IT Governance
• Maintain crypto-specific security policy addenda; support regulatory and IT audits on crypto scope

• 6+ years in information security, including recent experience as a senior security engineer, security architect, or security lead;
• Direct experience securing crypto, digital-asset custody, or a regulated financial platform; strong understanding of blockchain security, wallet architecture and key management;
• Working knowledge of cloud security fundamentals (AWS preferred, Azure/GCP acceptable) in a regulated environment;
• Practical knowledge of security in regulated…