Senior Cybersecurity Engineer - RMF/ISSE Lead

CACI International Inc; Sterling (VA); On-site; USD 103,800 - 218,100; Full time

Benefits offered by this job

Local travel up to 10%

Job summary

CACI International Inc is seeking a hands-on Senior Cybersecurity Engineer to lead the security posture of our division’s Electronic Warfare systems. You will implement, maintain, and adapt comprehensive security measures to protect customer data, systems, and networks throughout the lifecycle.

You will manage and mentor a small team of Security Engineers, driving secure design, RMF processes, ATO readiness, and continuous monitoring to defend mission-critical defense systems and national

Qualifications

• Bachelor’s degree or equivalent experience in a related field.
• 10+ years with ISSE/ISSO responsibilities, preferably in DoD/IC environments.
• Experience achieving IATT/ATO on DoD or IC programs.
• People management or team leadership experience.

Responsibilities

• Lead and mentor a team of 3–5 Security Engineers and oversee project delivery.
• Design secure system architectures across web apps, stacks, WAFs, IDS/IPS, and antimalware tooling; align with SDLC per NIST guidelines.
• Execute RMF activities (Steps 1–6) and guide systems to ATO.
• Develop and review A&A documentation (SSP, BoE) using Xacta/eMASS and ensure compliance.
• Oversee continuous monitoring and vulnerability management with IC/DoD tools.
• Direct incident response activities and participate in on‑call rotations.

Skills

RMF processes

NIST SP 800-53

NIST 800-64 Rev. 2

ISSE leadership

Linux/Unix

Education

Bachelor’s degree in computer science / cybersecurity / engineering / IT

Tools

Xacta

eMASS

Nessus

ACAS

Tenable

Job description

Job Overview

Senior Cybersecurity Engineer – RMF/ISSE Lead

Full time. Up to 10% local travel.

We are seeking a hands‑on Senior Cybersecurity Engineer to lead the security posture of our division’s family of Electronic Warfare systems. In this role, you will implement, maintain, and adapt comprehensive security measures to protect customer data, systems, and networks. Your work will ensure security is integrated throughout the system lifecycle, from design through operations, supporting the mission while maintaining a strong defensive posture.

In addition to your technical contributions, you will manage, guide, and mentor a small team of Security Engineers dedicated to supporting various security projects. This role requires strong leadership skills, deep understanding of security engineering principles, and the ability to foster a collaborative and innovative work environment.

This is an opportunity to make a direct impact on national security by leading cybersecurity operations for mission‑critical defense systems while developing the next generation of security professionals.

Responsibilities

• Team Leadership and Management
  Lead, mentor, and manage a team of 3-5 Security Engineers. Oversee project timelines, ensure delivery of high-quality security solutions, conduct performance evaluations, and provide ongoing professional development opportunities.
• Security Architecture & Engineering
  Lead the design and documentation of secure system architectures across web applications, application stacks, Web Application Firewalls (WAFs), Intrusion Detection/Prevention Sensors (IDS/IPS), antimalware technologies, and Advanced Persistent Threat (APT) prevention. Define security requirements and integrate capabilities across all SDLC phases (initiation, acquisition/development, implementation, operations/maintenance, disposition) following NIST 800-64 Rev. 2 guidelines.
• RMF Process Execution
  Manage and execute Risk Management Framework (RMF) activities (Steps 1–6), performing ISSO/ISSE functions to guide systems from initial categorization through Authorization to Operate (ATO). Direct team efforts in supporting DoD or IC acquisition programs resulting in IATT and/or ATO.
• Security Documentation & Compliance
  Develop, maintain, and review Assessment & Authorization (A&A) documentation using Xacta, eMASS, or equivalent tools (SSP, SCTM, BoE). Ensure hardware and software comply with Government Security Certification Officer (SCO) requirements and meet NIST SP 800-53, ICD 503, and CNSSI 1253 standards.
• Continuous Monitoring & Vulnerability Management
  Implement continuous monitoring (ConMon) activities and lead security audits using IC and DoD approved scanning tools: Nessus/ACAS, SCAP/SCC, STIG Viewer, Nmap, and additional vulnerability assessment platforms.
• Incident Response
  Direct incident response activities and participate in on‑call rotation for security incidents.

Qualifications

• Required Experience
  
  • Bachelor’s degree in computer science, cybersecurity, engineering, information technology, or related field (or equivalent experience)
  • 10+ years with demonstrated ISSE/ISSO responsibilities, preferably within the Intelligence Community or DoD environment
  • Experience achieving IATT and/or ATO on DoD or IC acquisition programs
  • People management or team leadership experience
• Clearance & Certifications
  
  • Current active TS/SCI eligibility
  • DoD 8570/8140 IASAE Level III (e.g., CISSP)
• Technical Expertise
  
  • RMF processes, NIST SP 800-53, NIST 800-64 Rev. 2
  • Experience integrating security across all SDLC phases
  • Network protocols (TCP/IP, DNS, HTTP/HTTPS), VPNs, IDS/IPS, firewalls, DMZ configurations
  • Hands‑on Linux/Unix experience
  • Web applications, application stacks, WAFs, and application‑layer security controls
  • A&A tracking tools (Xacta or eMASS), SCAP/SCC, vulnerability assessment tools (Nessus, ACAS, Tenable)

What You Can Expect

A culture of integrity: At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high‑performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.

An environment of trust: CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.

A focus on continuous growth: Together, we will advance our nation’s most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy.

Pay Range

We offer competitive compensation, benefits and learning and development opportunities. The proposed salary range for this position is $103,800 – $218,100, subject to factors such as geographic location, contract categories, experience, skills, education, and certifications.

CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.