Job DescriptionAs a
Senior Offensive Security Consultant on our Cyber Defense team, you will get the opportunity to lead adversarial testing engagements for clients across a range of industries. In this role, you will simulate real-world adversaries to identify exploitable weaknesses, validate detection and response capabilities, and help clients measurably strengthen their security posture. This is a hands-on technical role with significant client interaction and ideal for someone who thrives on solving complex problems and communicating impact to both technical teams and executive stakeholders.
From day one, you'll be empowered by the greater Cyber & Risk team to help clients make the moves that will help them achieve their vision and help you achieve more, confidently.
Your day-to-day may include:- Penetration Testing: Plan and execute network, application, API, and cloud penetration tests, from scoping through exploitation, post-exploitation, and reporting.
- Adversary Emulations: Design and run, threat-informed attack simulations to validate the effectiveness of client security controls and detection coverage.
- Assume-Breach: Conduct assume-breach engagements, collaborating with defensive teams to test detection, response, and containment capabilities.
- AI Red Teaming: Perform adversarial testing of AI/ML systems and LLM-enabled applications, including prompt injection, model manipulation, data exfiltration, and abuse-case testing.
- Threat Emulation: Emulate the tactics, techniques, and procedures (TTPs) of relevant threat actors, mapping activity to frameworks such as MITRE ATT&CK.
- Reporting & Communication: Produce clear, high-quality deliverables that translate technical findings into prioritized, business-relevant remediation guidance; present results to technical staff, management, and executive/board audiences.
- Client Advisory: Serve as a trusted technical advisor, helping clients understand risk, prioritize remediation, and mature their security programs.
- Practice Development: Contribute to methodology development, tooling, automation, and the mentoring of junior team members.
You have the following technical skills and qualifications:- Bachelor's degree in Cybersecurity, Information Technology, Computer Science, or a related field is required
- 3+ years of hands-on experience in offensive security, penetration testing, or red teaming.
- Demonstrated expertise across multiple domains (network, application, cloud, and/or internal infrastructure testing).
- Strong understanding of adversary TTPs and frameworks such as MITRE ATT&CK and ATLAS and OWASP.
- Proficiency with industry-standard tooling and command-and-control frameworks.
- Scripting and automation skills (e.g., Python, PowerShell, Bash).
- Experience conducting assume-breach or adversary emulation engagements.
- Excellent written and verbal communication skills, including the ability to produce professional, client-ready reports.
- Ability to work independently, manage multiple engagements, and meet deadlines in a client-service environment.
Preferred qualifications:- Relevant certifications such as OSCP, OSEP, OSWE, GPEN, GXPN, GWAPT or CREST.
- Prior consulting or professional-services experience.
- Cloud security testing experience across AWS, Azure, and/or GCP.
- Experience with AI/ML or LLM security testing and adversarial techniques.
- Familiarity with breach and attack simulation platforms.
- Experience testing the security of D365 and integrations a plus.
- Contributions to the security community (research, tooling, CVEs, conference talks, or publications).
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Benefits: We understand that your needs, responsibilities and experiences are different, and we think that's a good thing. That's why we support you with personalized and comprehensive benefits that recognize and empower all the identities, roles and aspirations that make you, well, you. For an overview of our benefit offerings, please visit: https://www.grantthornton.com/careers/rewards-and-benefits
- Benefits for internship positions: Grant Thornton interns are eligible to participate in the firm's medical, dental and vision insurance programs and the firm's employee assistance program. Interns also receive a minimum of 72 hours of paid sick leave, and are paid for firm holidays that fall within their internship period.
- Benefits for seasonal employee positions: Grant Thornton seasonal employees are eligible to participate in the firm's medical, dental and vision insurance programs and the firm's employee assistance program. Seasonal employees may also be eligible to participate in the firm's 401(k) savings plan and employee retirement plan in accordance with applicable plan terms and eligibility requirements. Seasonal employees receive a minimum of 72 hours of paid sick leave.
Grant Thornton employees may be eligible for a discretionary, annual bonus based on individual and firm performance, subject to the terms, conditions and eligibility criteria of the applicable bonus plan or program. Interns and seasonal employees are not eligible for bonus compensation.
