Information System Security Engineer (ISSE) III

Diligent Consulting Inc; Philadelphia (Philadelphia County); On-site; USD 100,000 - 140,000; Full time

Job summary

Diligent Consulting Inc is looking for an Information Systems Security Engineer III to join their team in Philadelphia. In this role, you will provide advanced cybersecurity services to the Naval Surface Warfare Center, fostering national defense through innovative solutions and strategies. Ideal candidates will have substantial experience in cybersecurity engineering and a commitment to mission success.

Benefits

Competitive salary and comprehensive benefits package

Professional growth in a mission-driven, collaborative environment

Direct impact on national defense and naval readiness

Cutting-edge cyber engineering work at the system level

Qualifications

• 8+ years of experience in information assurance and cybersecurity engineering.
• Active Secret Clearance required.
• IAT Level III Certification (CISSP, CASP+).

Responsibilities

• Lead complex security engineering tasks throughout the system lifecycle.
• Execute full-spectrum RMF activities including control tailoring.
• Author and maintain RMF documentation like System Security Plans.

Skills

Cybersecurity Engineering

Risk Management Framework (RMF)

Technical Writing

Vulnerability Assessment

Education

Bachelor’s degree in Cybersecurity, Computer Science, or Systems Engineering

Tools

NIST SP 800-53 Rev 5

ACAS

HBSS

VRAM

SCC

Job description

Contingent on Award June/July 2025

Engineer the Cybersecurity Backbone of the Navy's Next-Generation Systems.
Diligent Consulting is seeking Information Systems Security Engineers (ISSE III) to provide advanced cybersecurity and Risk Management Framework (RMF) engineering services to the Naval Surface Warfare Center, Philadelphia Division (NSWCPD). This isn’t a checkbox compliance role—we need engineers who architect secure solutions, shape cyber strategy, and turn NIST controls into operational strength.

If you thrive at the intersection of mission and security architecture, this role is built for you.

Key Responsibilities:

• Lead complex security engineering tasks throughout the system lifecycle: design, development, integration, and sustainment.

• Execute full-spectrum RMF activities (Steps 0–6), including control tailoring, POA&M management, and continuous monitoring.

• Author and maintain RMF documentation: System Security Plans (SSP), Security Assessment Reports (SAR), ISCM strategies, CAPs, and risk assessments.

• Apply guidance from NIST SP 800-53 Rev 5, DoDI 8510.01, and NAVSEA/Navy cybersecurity policies.

• Conduct vulnerability assessments and remediation planning using ACAS, HBSS, VRAM, SCC, and related DoD tools.

• Collaborate with ISSMs, AOs, developers, and system owners to define system boundaries, safeguards, and security architectures.

• Serve as cybersecurity SME during design reviews, connection requests, and mission-critical deployments.

• Analyze risk posture and support risk acceptance decisions with security-first, mission-aware insight.

Minimum Qualifications:

• Bachelor’s degree in Cybersecurity, Computer Science, Systems Engineering, or related field

• 8+ years of experience in information assurance, cybersecurity engineering, or RMF package development

• IAT Level III Certification required (CISSP, CASP+, or equivalent per DoD 8140.03M)

• Deep experience with:

  • DoD RMF lifecycle (Steps 0–6)

  • NIST SP 800-53 Rev 5, STIGs, and POA&M management

  • Navy eMASS, VRAM, SCC, and cybersecurity reporting workflows

Preferred Qualifications:

• Master’s degree in Cybersecurity or Engineering

• Prior experience supporting Navy or NAVSEA cybersecurity programs

• Strong technical writing skills and experience briefing senior leadership

• Familiarity with DevSecOps and Zero Trust principles

Clearance:

• Active Secret Clearance required

• Top Secret Clearance preferred

Why Join Diligent Consulting:

• Direct impact on national defense and naval readiness

• Cutting-edge cyber engineering work at the system level

• Competitive salary and comprehensive benefits package

• Professional growth in a mission-driven, collaborative environment