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Senior Security Engineer

McLean, VAOnsite6+ YOE
Summary

Senior Security Engineer conducts offensive security testing on AI systems, cloud infrastructure, and applications at a fintech startup. Collaborates with engineers to remediate vulnerabilities and builds automated tools, requiring 6+ years experience in red teaming and AWS security.

About the role

Responsibilities

  • Probe AI systems, infrastructure, and applications for weaknesses through red teaming and penetration testing.
  • Work directly with engineers to remediate vulnerabilities.
  • Develop detection and response capabilities for threats.
  • Analyze AI-specific risks like training pipelines, inference systems, model architectures, and supply chain threats.
  • Build automated security testing tools.
  • Contribute to security metrics and raise engineering team's security awareness.

Requirements

  • 6+ years of professional security engineering experience.
  • Deep hands-on experience with offensive security: red teaming, penetration testing, or vulnerability research.
  • Experience assessing cloud infrastructure security, preferably AWS (EC2, ECS, RDS, S3, IAM).
  • Ability to develop custom tools and automation (Python, Go).
  • Experience analyzing and exploiting web application vulnerabilities.
  • Strong understanding of threat actor techniques, tactics, and procedures (TTPs).
  • Ability to translate technical findings into actionable recommendations.
  • Bachelor's degree in Computer Science, Cybersecurity, or equivalent.

Nice-to-Haves

  • Experience with AI/ML system security: training pipelines, inference systems, model architectures.
  • Familiarity with AI-specific attacks: prompt injection, model poisoning, data extraction.
  • Fintech or financial services security experience.
  • Experience building security metrics and reporting.
  • Startup experience.
  • Certifications: OSCP, OSCE, GXPN.

Benefits

  • 100% employer-covered medical insurance for employees (75% dependents), dental, vision.
  • 401(k) retirement savings.
  • Paid time off + federal holidays.
  • Parental leave.
  • Meals and fitness stipend.
  • Equity and career growth opportunities.
Skills
AWSPythonGoPenetration TestingRed TeamingWeb Application SecurityAI/ML SecurityCloud InfrastructurePrompt InjectionModel Poisoning