Senior Security Architect — Lead Secure Crypto Trading

Bullish, Inc.; City of Westminster; On-site; GBP 110,000 - 160,000; Full time

Job summary

Bullish, Inc. is seeking a senior security architect for our London-based Security Architecture team.

You will influence secure software across web, API, mobile, and FIX platforms, shaping defenses for critical trading systems in a fast-moving crypto landscape. You will lead threat modeling, vulnerability assessments, and security tooling, while mentoring teams and collaborating with product and infrastructure to maintain industry-leading resilience.

Qualifications

• 10+ years in cybersecurity with hands-on coding
• Deep threat modeling, pen testing, code reviews
• Experience with cloud platforms (AWS/Azure/GCP) and Linux environments
• Strong knowledge of secure software development (CI/CD, Agile) and security tooling

Responsibilities

• Build threat models for critical systems and define security requirements
• Partner with Product, Engineering, and Infrastructure to ship secure software across web, API, mobile, FIX
• Lead global security initiatives and build AI-powered tooling to scale the program
• Assess vulnerabilities and provide actionable recommendations to executives
• Mentor cybersecurity and engineering teams and drive projects end-to-end

Skills

Cybersecurity

Threat modeling

Penetration testing

Code reviews

Offensive security

Public cloud

Linux

Programming languages

Tools

SAST

DAST

OWASP

Vulnerability Management

API tracing

Job description

Bullish, Inc. is seeking a senior security architect for our London-based Security Architecture team.

You will influence secure software across web, API, mobile, and FIX platforms, shaping defenses for critical trading systems in a fast-moving crypto landscape. You will lead threat modeling, vulnerability assessments, and security tooling, while mentoring teams and collaborating with product and infrastructure to maintain industry-leading resilience.