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Offensive Security Engineer

https://www.citi.com/ Logo

Citi

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Location:
United Kingdom , London

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

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Job Description:

We are Citi’s Application, Platform and Engineering team, a start-up with the exciting mission of shaping the direction of travel for the entire bank under the Chief Technology Office, by defining the tech and engineering strategy for the bank. We are a team of talented engineers, product managers and tech SMEs, taking ambiguous concepts and making them real by engineering cutting edge products at planetary scale! We are solely focused on the most modern technology and engineering disciplines such as generative AI, cloud, security, modern app stacks (with Golang, Gatekeeper), open source and the latest and greatest in the Kubernetes ecosystem.

Job Responsibility:

  • Build secure AI products from 0-1 - Engineer production-grade, business-facing AI platforms with security built-in from day one
  • Ethical hacking and red team activities - Conduct penetration testing, vulnerability research, and attack simulation to make our products bulletproof
  • Design and build security tools and frameworks - Create automated security solutions that scale across fast-paced development cycles
  • Secure novel AI attack surfaces - Identify and mitigate LLM-specific vulnerabilities, prompt injection attacks, and AI model security risks through hands-on testing
  • Lead "shift left" security - Embed security practices throughout our rapid development lifecycle while maintaining velocity
  • Mentor security practices - Guide other engineers on secure coding, vulnerability remediation, and security-first thinking

Requirements:

  • Proficient in Golang
  • Production system builder with security focus - proven track record of architecting and building secure, large-scale production applications and business-facing platforms from the ground up
  • Ethical hacking and penetration testing expertise - hands-on experience finding and exploiting vulnerabilities, conducting red team exercises, and thinking like an attacker to strengthen defenses
  • State-of-the-art security engineering with Go, Python, JavaScript - you build both security tools and secure production systems in fast-paced environments
  • HashiCorp Vault mastery - deep experience writing custom plugins, creating secrets engines, implementing dynamic credentials, and extending Vault functionality for enterprise-scale secrets management
  • Enterprise authentication & authorization - designing and implementing OAuth, JWT, RBAC, and complex identity systems with fine-grained access controls in business-critical applications
  • API security and threat modelling - securing REST/GraphQL APIs, conducting threat assessments, and implementing advanced security patterns in high-traffic production systems
  • AI/ML security and vulnerability research - understanding of LLM vulnerabilities, model security, prompt injection attacks, and AI-specific threat vectors through hands-on testing
  • Security automation and tooling – automating manual security processes
  • Cloud-native security - securing containerized applications in Kubernetes, service mesh security, and cloud-native security patterns at enterprise scale
  • Incident response and forensics - experience investigating, analyzing, and responding to security incidents in live production systems
What we offer:
  • 27 days annual leave (plus bank holidays)
  • A discretional annual performance related bonus
  • Private Medical Care & Life Insurance
  • Employee Assistance Program
  • Pension Plan
  • Paid Parental Leave
  • Special discounts for employees, family, and friends

Additional Information:

Job Posted:
January 15, 2026

Employment Type:
Fulltime
Work Type:
Hybrid work
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