Information System Security Officer (ISSO)

Job Description

Job Description

Information System Security Officer – Top Secret Clearance | Philadelphia, PA

Cambridge International Systems, Inc.

Join a dynamic global team united by shared values: commitment, integrity, and perseverance. At Cambridge, you’ll work alongside top talent worldwide, tackling some of today’s most complex and critical challenges in defense and security.

We are currently seeking an Information System Security Officer to support operations in Philadelphia, PA. This is a full-time, CONUS position requiring an active DoD Top Secret clearance.

This position is contingent upon contract award. The expected award date is May 2026.

What You’ll Do

• Serve as an ISSO supporting RMF compliance and cybersecurity for DoD systems.

• Implement and monitor security controls, ensuring adherence to NIST 800-53 and DoD policies.

• Conduct vulnerability assessments, threat analyses, and continuous monitoring using tools like ACAS, STIG Viewer, and eMASS.

• Support incident response activities, including isolating assets, collecting data, and reporting findings.

• Maintain RMF documentation (SSPs, POA&Ms, RARs) and ensure system accreditation packages remain current.

• Collaborate with system owners, administrators, and the ISSM to sustain system security posture.

• Track, report, and resolve cybersecurity findings while preparing for audits and inspections.

What You’ll Bring

Required Qualifications:

Education & Experience:

• Bachelor’s degree in computer science, information technology, communications systems management, or an equivalent science, technology, engineering & mathematics (STEM) degree from an accredited college or university

Technical Expertise:

• Six (6) years of experience implementing and coordinating cybersecurity policies across organizational levels, ensuring compliance with DoD and federal standards.

• Proven expertise conducting vulnerability assessments, threat analyses, and risk mitigation activities.

• Demonstrated ability to support cyber incident response — including isolating affected assets, performing initial investigations, collecting data, and providing detailed status reports.

Certifications:

• Meets DoD IAM Level II baseline requirements — holding one or more of the following: CAP, CASP+ CE, CISM, CISSP (or Associate), GSLC, CCISO, or HCISPP

• OS/CE Qualification: As directed by Privileged Access Agreement and DFARS 252.239-7001 requirements.

• Must have a current and active DoD Top Secret security clearance.

• Proficient with modern IT tools and infrastructure technologies

Travel & Passport

• Some overnight stays possible.

Work Environment

• Compliance with vaccination and medical requirements for TDY/OCONUS roles as per Vaccine Recommendations by AOR | Health.mil.

Office setting:

• Primarily an office-based role in Philadelphia, PA

• Standard desk/computer work with flexibility for walking and movement on site

• Must be able to work in an office environment, sitting at a desk, looking at a computer for most of the workday.

• Work is physically comfortable; the employee has discretion about sitting, walking, standing, etc.

• May be required to travel short distances to offices/conference rooms and buildings on site.

Background & Security

• Employment is contingent upon successful background investigation

• Drug screening may be required for federal contract compliance

Benefits & Perks

We believe in investing in our team—both professionally and personally:

• Medical, dental, vision, life, accident, and critical illness insurance

• 401(k) immediate vesting and match

• Paid time off and company holidays

• Generous tuition & training support

• Relocation assistance

• Sign-on and performance-based bonuses

• Employee referral program

• Access to Tickets at Work, EAP, wellness initiatives, and more

Join Us

If you're driven by mission, technology, and teamwork—we want to hear from you. Cambridge is growing, and this position is just one of many opportunities on our global team. Know someone perfect for the role? Referrals are welcome—both employees and non-employees may qualify for a bonus.

Apply today and help shape the future of secure cloud computing for national security.

About Cambridge International Systems

At Cambridge, innovation grows through diversity. We are proud to be an equal opportunity employer, committed to creating an inclusive and supportive work environment for all. Learn more at

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