Information System Security Officer (ISSO) - Top Secret Clearance | Philadelphia, PA

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 View phone number on us.fitly.work 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, we recognize innovation and agility grow through teamwork. By working collaboratively, listening proactively, and engaging across functions we create solutions that build on the best ideas our employees bring to the table. We are committed to one another, to persevere in order to get the job done, and to do so with integrity every time. Learn more at 

We are an equal opportunity employer. Applicants and employees are considered for positions and are evaluated without regard to any protected status under applicable law or other similar factors that are not job-related. We encourage all qualified individuals to apply for employment. Selected applicants may be subject to a background investigation and/or education verification. 

We provide reasonable accommodation for qualified individuals with disabilities in accordance with federal, state, and local law. If you require a reasonable accommodation to participate in the application process or to perform the essential functions of the position, please contact our Recruiting Team at View email address on us.fitly.work.

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