Security Engineer, Institutional Trading

As a Security Engineer for Institutional Trading at Blockchain, you'll embed with the Institutional Trading and Financial Operations (FinOps) team to secure off-chain trading processes and infrastructure. You'll focus on the safe operation of integrations, signing flows, key custody interfaces, middle-office workflows, order routing and settlement pipelines that handle significant capital. This role centers on operational security engineering, ensuring traders have resilient tools and processes protected against external threats and internal errors. Smart-contract auditing is not required.

What you'll do

• Partner with Trading, Middle Office and Quant teams to map inventory trading systems, data flows, third-party integrations and custody/settlement touchpoints.
• Conduct deep-dive assessments to identify structural vulnerabilities in critical assets and workflows, define the Target State, and draft strategic Risk Treatment Plans to meet institutional-grade standards such as CCSS, NIST and DORA.
• Act as the primary security liaison for Senior Management and third-party vendors, translating complex technical gaps into actionable business risk summaries and managing vendor evaluations and project lifecycles for security infrastructure upgrades.
• Implement and maintain monitoring for FinOps-specific security signals such as abnormal order patterns, signature misuse and unusual settlements, integrating these into your SIEM/SOAR for real-time response.
• Support secrets and key-management hygiene by ensuring app and service keys are stored in KMS/Vault, scoped to least privilege and rotated automatically.
• Assist product security in triaging SAST/SCA findings for FinOps-related repositories and help implement CI checks and remediation playbooks.
• Participate in incident exercises, post-incident reviews and remediation tracking for trading incidents.
• Document controls and produce concise risk summaries for FinOps leads and the Security team.
• Research, architect and safely embed cutting-edge AI utilities and Large Language Model agents into secure infrastructure.

What you bring

• 5+ years in security engineering, platform security or application security.
• Proven expertise in threat modeling and ability to perform structured reviews such as STRIDE of complex data flows and operational processes.
• Experience with observability and detection tooling (SIEM, logs, metrics) and ability to write basic detection rules.
• Practical experience with KMS/HSM, secrets management platforms (Vault, 1Password, AWS/GCP KMS), IAM patterns and least-privilege access.
• Exceptional ability to translate technical debt into business risk for C-suite stakeholders such as CFO, CTO and Head of Trading.
• Ability to raise, read and audit Pull Requests in at least one language used in the stack (TypeScript, Java/Kotlin, Python).
• Experience conducting technical due diligence and scoping for third-party security integrations.

Nice to have

• Familiarity with trading systems or financial operations such as market-making, execution and settlement, or close collaboration background with trading and quant teams.
• Exposure to blockchain on-chain concepts such as wallets, addresses and transactions (no requirement to audit contracts).
• Familiarity with SOC operations and post-incident forensic analysis.
• Familiarity with SOC2, ISO 27001 or financial audit requirements.
• Any relevant industry certification.

What we offer

• Full-time salary based on experience and meaningful equity in Blockchain
• London office based with mandatory in-office presence four days per week
• Work from Anywhere policy allowing remote work from anywhere in the world for up to 20 days per year
• ClassPass membership
• Unlimited vacation policy
• Apple equipment
• Flexible work culture

About Blockchain

Blockchain connects the world to the future of finance. The company has earned the trust of over 90 million wallet holders and more than 40 million verified users since 2011, facilitating over $1 trillion in crypto transactions.