Senior Security Engineer — Proactive Security Lead (Remote)

Capital Markets Gateway; Greater London; Hybrid; GBP 90,000 - 140,000; Full time

Benefits offered by this job

Equity

Unlimited PTO

Comprehensive benefits program

Pension contributions

Hybrid work environment

Education reimbursement

Continuous learning opportunities

Employee referral bonus

Parental leave

Job summary

Capital Markets Gateway LLC (CMG) is seeking a Senior Security Engineer to own security risk management, threat modeling, and governance initiatives. You will report to the CISO and drive cross‑program work with senior leadership, turning complex risks into actionable, repeatable security workflows.

The role covers cloud security, supply‑chain, endpoint and identity controls, and AI security, with a path from senior IC to broader leadership as the program scales.

Qualifications

• Have 6+ years of hands-on security experience, with depth in risk management and design reviews.
• Experience running governance, risk & compliance work (SOC 2 or similar).
• Thrives in a fast-paced startup or small company, owning large initiatives end-to-end.

Responsibilities

• Lead security risk management, threat modeling across products and infra.
• Run risk assessments and translate findings into prioritized remediation.
• Perform security design reviews with Engineering and DevOps to reduce risk.

Skills

Threat modeling

Security risk management

Security design

Governance & compliance

Cloud security

CI/CD security

Scripting (Python)

Tools

GitHub Enterprise Cloud

Azure

Entra ID

Sentinel

Job description

Capital Markets Gateway LLC (CMG) is seeking a Senior Security Engineer to own security risk management, threat modeling, and governance initiatives. You will report to the CISO and drive cross‑program work with senior leadership, turning complex risks into actionable, repeatable security workflows.

The role covers cloud security, supply‑chain, endpoint and identity controls, and AI security, with a path from senior IC to broader leadership as the program scales.