Senior Offensive Security Engineer - Internal Audit

We are seeking bright, curious, and ambitious individuals eager to make an impact. Ideal candidates have:

5+ years of relevant offensive security experience, including at least three recent years conducting penetration tests, red team engagements adversary emulation exercises, or purple team assessments in complex military or civilian environments.

A four-year college degree

Demonstrated ability to independently scope, plan, execute, document, and clearly communicate technically sophisticated security assessments to both engineering and executive-level audiences.

Broad knowledge of enterprise attack surfaces, including hands-on experience with several of the following domains: identity systems (LDAP, IAM), operating systems (Windows and Linux), network infrastructure, cloud platforms, web applications and APIs, endpoint systems, and security monitoring tools.

Practical experience identifying and validating exploitable attack chains, bypassing or testing security controls, and determining whether detection and response mechanisms function as intended.

Strong scripting or automation skills and the ability to adapt tools and techniques to assess unfamiliar environments effectively.

Ability to operate safely and effectively in production-sensitive environments while maintaining strict adherence to rules of engagement and approved scope.

Sound judgment, discretion, and a disciplined approach to handling privileged information and sensitive findings.

Excellent written and verbal communication skills that translate technical weaknesses into clear business impact and remediation priorities for both engineers and senior leaders.

A collaborative style that builds trust with Security and Systems teams while maintaining the objectivity required of an independent assurance function.

A track record of taking initiative, identifying high-impact areas for investigation, and driving work through remediation and retesting.

Total cash compensation generally ranges from $170,000-$250,000 and includes profit sharing based on company performance.

Growth & Learning

100% tuition reimbursement

Informal and formal mentorship

Employee resource groups

Health & Wellbeing

Medical, dental, pharmacy and vision plans without monthly premiums

Inclusive, all-gender benefits

Family & Future

Paid parental leave for all new parents

Adoption and surrogacy assistance

First-time home buyer assistance

Industry-leading company-funded retirement accounts

Time Off

Paid vacation and personal time

Equal Opportunity Employer

We are proud to be an Equal Opportunity Employer and dedicated to providing employees a workplace with reasonable accommodations and free of discrimination, harassment, and retaliation. At McMaster-Carr, we do not make employment decisions based on age, ethnicity, citizenship status, military status, gender identity and expression, race, religion, disability status, marital status, sexual orientation, or any other legally protected group.

This position is not eligible for work authorization sponsorship by McMaster-Carr.

Data We Collect

We may collect professional, education and employment-related data, and any assessments made throughout the recruiting process, to evaluate candidacy for employment. To communicate with job applicants, we may collect applicant names, contact information, and other personal identifiers, including those outlined in the California customer records statute. Through voluntary disclosure, we may also collect protected classifications under federal or California law (e.g., race, gender, etc.). For additional details about the personal information we collect and its uses, please click here.