Security Engineering Lead, Citi

Citi

Location:
United Kingdom, London

Category:
IT - Software Development

Contract Type:
Employment contract

Salary:

Not provided

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Job Description:

Citi's Application, Platform and Engineering team is looking for a Security Engineering Lead to engineer cutting-edge AI products at planetary scale, ensuring security is built into every aspect of development. The role involves leveraging modern technologies, conducting penetration testing, and mentoring secure coding practices.

Job Responsibility:

Build secure AI products
conduct penetration testing and vulnerability research
design automated security solutions
identify and mitigate AI-specific vulnerabilities
lead security practices in development lifecycles
mentor engineers on secure coding practices.

Requirements:

Bring your deep-dive application security engineering expertise from building production systems
thrive in a results-driven environment, where flexibility fuels impact
be a game-changer, ready to step beyond your designated role
love the synergy of pair programming
seize the opportunity to secure AI applications at scale
have a relentless passion to learn more about AI security, LLM attacks, and bringing your knowledge to shape Citi's secure AI future
proven track record of architecting and building secure, large-scale production applications and business-facing platforms from the ground up
hands-on experience finding and exploiting vulnerabilities, conducting red team exercises, and thinking like an attacker to strengthen defenses
experience building security tools and secure production systems with Go, Python, JavaScript
deep experience with HashiCorp Vault for enterprise-scale secrets management
designing and implementing OAuth, JWT, RBAC, and complex identity systems
securing REST/GraphQL APIs and conducting threat assessments in high-traffic production systems
understanding of LLM vulnerabilities, prompt injection attacks, and AI-specific threat vectors
automating manual security processes
securing containerized applications in Kubernetes and service mesh environments
experience investigating and responding to security incidents in live production systems.

Nice to have:

pair programming
knowledge of AI security and LLM attacks
experience with generative AI projects utilizing LLMs.

What we offer:

27 days annual leave plus bank holidays
discretional annual performance-related bonus
private medical care and life insurance
employee assistance program
pension plan
paid parental leave
special discounts for employees, family, and friends

Additional Information:

Job Posted:
November 15, 2025

Employment Type:

Fulltime

Work Type:

On-site work

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Security Engineering Lead