Senior Offensive Security & Penetration Tester

EY; Westlake Village (CA); On-site; USD 120,000 - 180,000; Full time

Job summary

EY is seeking a Senior Attack & Penetration Tester to lead complex security engagements and emulate adversary behavior across client environments. You will plan, execute, and report on penetration tests and red team activities, translating results into actionable remediation strategies.

You will work with cross‑functional teams, mentor junior testers, and stay current on vulnerabilities and offensive security tooling, with travel up to 80% as required.

Qualifications

• Experience leading penetration tests and red team engagements.
• Ability to apply threat-informed testing aligned with ATT&CK.
• Strong communication of risk to executives and clients.
• Willingness to travel up to 80% domestically and internationally.

Responsibilities

• Plan, lead, and execute complex penetration tests and red team engagements.
• Apply an intelligence-led approach to identify exploit paths and evaluate controls.
• Coordinate testing activities and mentor junior team members.
• Translate testing results into remediation strategies for clients.

Skills

Penetration Testing

Red Team

MITRE ATT&CK

Active Directory

Cloud Security

Executive Communication

Tools

Offensive security tooling

Job description

EY is seeking a Senior Attack & Penetration Tester to lead complex security engagements and emulate adversary behavior across client environments. You will plan, execute, and report on penetration tests and red team activities, translating results into actionable remediation strategies.

You will work with cross‑functional teams, mentor junior testers, and stay current on vulnerabilities and offensive security tooling, with travel up to 80% as required.