Senior AI Security Engineer (Remote)

EY; Jacksonville (FL); Hybrid; USD 107,000 - 193,000; Full time

Benefits offered by this job

Medical and dental coverage

Pension and 401(k) plans

Paid time off options

Job summary

EY is seeking a senior security professional to join Challenger, EY’s program building AI security capabilities. You will embed defenses across AI lifecycles, work with product and engineering teams, and develop repeatable security patterns and evidence for accountable decision making.

The role requires hands-on security ownership of production controls, threat modeling, and cross‑functional collaboration, with up to 50% travel and hybrid office flexibility.

Qualifications

• 5+ years of relevant experience.
• Bachelor’s Degree in a relevant field.
• Substantial experience in product, application, cloud, platform, or detection security, including hands-on ownership of production controls.
• Threat modeling: ability to assess complex systems and turn attack paths into practical engineering measures.
• Production security: securing modern applications, cloud environments, identities, data, and software delivery pipelines.
• AI systems knowledge: working understanding of generative and agentic AI, including retrieval, model access, tool use, evaluation, and runtime behavior.
• Hands-on automation: building or extending security tests, controls, telemetry, reference implementations, or adversarial assessments.
• Response experience: supporting vulnerability or incident response and translating lessons into stronger technical controls.
• Cross-functional delivery: partnering with engineers and risk functions to improve security while respecting user value and delivery constraints.
• Travel and On-site requirements: up to 50% travel and hybrid office flexibility.

Responsibilities

• Set the security direction. Own reusable AI security patterns, control objectives, reference architectures, and threat models aligned to the risk and autonomy of each use case.
• Join builders early. Work with teams before key design choices are fixed, identifying credible attack paths and shaping controls that fit the product and delivery model.
• Design scoped authority. Create practical patterns for identity, access, isolation, approvals, and recovery so tool-using AI acts within clear and enforceable boundaries.
• Protect sensitive information. Embed security across the data lifecycle, preserving confidentiality, integrity, provenance, and monitored access.
• Secure the delivery path. Integrate automated security tests, policy gates, trusted artifacts, traceable changes, and safe rollback into engineering workflows.
• Test adversarially. Run focused red-team exercises against AI-specific abuse cases and convert findings into repeatable tests and stronger patterns.
• Build runtime protection. Use end-to-end evidence and behavioral signals to detect abnormal actions and privilege misuse.
• Strengthen response. Support vulnerability triage and incidents with clear evidence and containment options.
• Advise on residual risk. Provide concise technical recommendations to leadership while keeping risk ownership.
• Build shared capability. Create reference implementations, coach engineers, and turn production lessons into reusable controls.

Skills

Security engineering

AI threat judgment

Control engineering

Adversarial mindset

Automation capability

Pragmatic influence

Travel and on-site up to 50%

Education

Bachelor's Degree in a relevant field

Job description

EY is seeking a senior security professional to join Challenger, EY’s program building AI security capabilities. You will embed defenses across AI lifecycles, work with product and engineering teams, and develop repeatable security patterns and evidence for accountable decision making.

The role requires hands-on security ownership of production controls, threat modeling, and cross‑functional collaboration, with up to 50% travel and hybrid office flexibility.