Information system security engineer

We are an employee-centric company that truly appreciates our team members and their value to our customers and the missions they support. We pride ourselves on being forward-leaning thinkers and fostering teams that are and continue to be technically proficient and technically capable across a comprehensive range of cyber mission areas. OneZero full-time employees receive an extremely competitive benefits package that includes health/dental/vision/life insurance plans, 401K with company matching, PTO & paid holidays, employee referral program, and educational assistance. Additional details can be found on our website at:

Position Title : Information System Security Engineer ISSE III

Clearance : Secret

Location : Philadelphia PA with Travel to Keyport, FL and San Diego

Job Summary :

This position will work with OneZero Solutions to support the Naval Surface Warfare Center Philadelphia Division (NSWCPD). The NSWCPD is a Department of Defense entity responsible for research and development, test and evaluation, engineering and fleet support organization for the Navy's ships, submarines, military watercraft and unmanned vehicles. This requirement is for NSWCPD Code 104, which is responsible for Information Technology Operations Division of NSWCPD's Research, Development, Test & Evaluation (RDT&E) and Business Systems cybersecurity and information assurance support.

The ISSE III plays a critical role in securing mission-critical systems for the U.S. Navy. This senior-level position involves leading cybersecurity engineering efforts across the full system lifecycle, ensuring compliance with federal cybersecurity standards, and supporting Risk Management Framework (RMF) activities.

Education and Experience

• Bachelor's Degree in computer science, information technology, communications systems management, or an equivalent technical degree from an accredited college or university.
• Seven (7) years' professional experience capturing and refining information security operational and security requirements, and ensuring those requirements are properly addressed through purposeful architecting, design, development, and configuration, and implementing security controls, configuration changes, software/hardware updates/patches, vulnerability scanning, and securing configurations.
• Minimum certification requirement: CASP+ CE, CCNP Security, CISA, CISSP (or Associate), GCED, GCIH, CCSP.

Essential Duties

• Security Architecture & Engineering:
  • Design and implement secure system configurations.
  • Develop and maintain security documentation (SSPs, SARs, RARs).
  • Conduct threat modeling and vulnerability assessments.
• RMF & Compliance :

• Execute RMF Steps 0-6 including POA&M management and continuous monitoring.
• Tailor and implement security controls per NIST SP 800-53 Rev 5, DoDI 8510.01, and NAVSEA policies.
• Utilize tools like eMASS, ACAS, HBSS, VRAM, SCC, and SCAP.

• System Support & Documentation:
  • Develop and review technical manuals, installation guides, and training materials.
  • Support configuration management and change control processes.
  • Perform routine audits and patch management for IT systems.
• Collaboration & Leadership:
  • Interface with ISSMs, AOs, developers, and stakeholders.
  • Provide mentorship to junior engineers.
  • Brief project managers and leadership on security posture and risks.

Knowledge, Skill and Abilities:

• Have worked with Information Assurance tools such as DISA Enterprise Mission Assurance Support Service (eMASS), Assured Compliance Assessment Solution (ACAS) and may be required to hold a Full Security Control Assessor qualification.
• Strong written and verbal communication skills and excellent presentation skills.
• Ability to read, write, speak, and understand English.

OneZero Solutions, LLC is an Equal Opportunity/Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.

If you are a qualified individual with a disability or a disabled veteran, you have the right to request an accommodation if you are unable or limited in your ability to use or access as a result of your disability.

To request an accommodation, please contact us at [email protected] or call (202) 987-2580.