Senior Cyber Security Engineer I - SIGINT - San Diego

Epsilon Systems Solutions, Inc; San Diego (CA); On-site; USD 165,000 - 185,000; Full time

Job summary

Epsilon Systems Solutions, Inc. in San Diego, CA seeks a Senior Cyber Security Engineer I with 6+ years of experience to lead security configurations and RMF compliance for DoD systems.

The role focuses on implementing STIGs, maintaining a strong security posture, and collaborating with software teams to ensure secure development and sustained compliance. Active DoD Top Secret with SCI access is required.

Qualifications

• Six or more years in Cyber Security, Systems Engineering or related field.
• Five or more years of RMF experience with A&A requirements.
• IA Level I or higher certification.
• Two+ years with Tenable Security Center and Nessus.
• Two+ years with SCAP (SCC).
• Knowledge of NIST SP 800-53 Rev 4/5.

Responsibilities

• Interpret and implement STIGs across Windows, Linux, network, and virtualization platforms.
• Plan and monitor cybersecurity measures to improve posture.
• Ensure secure coding practices with software team.
• Assess vulnerabilities and implement remediation or risk mitigation.
• Ensure controls during development and in fielded systems.
• Engage with release planning to maintain security relevance.

Skills

DISA STIGs knowledge

RMF experience

NIST SP 800-53

IA Level I or higher cert

DoD Top Secret Clearance

Team collaboration

Education

Bachelor's Degree

Tools

Tenable Security Center

Nessus

SCAP/CC

Job description

Job ID: 2026-424 Date Posted: 2026-11-02T00:00:00 Location: San Diego, California Minimum Experience: 5 years Education: Bachelor's Degree

Epsilon C5I (www.epsilonsystems.com/c5i), focused on software development and systems engineering for complex command, control, intelligence and combat systems, is seeking a Senior Cyber Security Engineer I with a minimum of 6 years’ experience for work in San Diego, CA. Our engineering efforts provide the warfighter with tools to support critical support to operational missions to improve targeting capabilities. If you have a passion for excellence in engineering and enjoy working on challenging projects in a fast-paced, team-oriented environment – read on!

Summary:

The Cybersecurity Engineer shallbe responsible for leadingmultiple efforts for system configurations maintaining authority to operate. The Cybersecurity Engineer conducts information system security engineering activities, such as capturing and tracking evolving information security requirements and ensuring the system maintains a strong security posture through purposeful design and configuration.

Duties and Responsibilities:

• Experience interpreting, implementing, and maintaining DISA Security Technical Implementation Guides (STIGs) across Windows, Linux, network, and virtualization platforms.

• Plan, implement, upgrade, and/or monitor cybersecurity measures to maintain and improve the system’s cybersecurity posture.

• Work with a software team to ensure code is designed securely throughout development.

• Assess cybersecurity vulnerabilities of releases for risks and propose and implement remediation actions or risk mitigation strategies.

• Ensure appropriate security controls are in place during development and in fielded systems.

• Proactively engage with software and system release planning to advocate for designing a system that is secure and technically relevant.

Required Qualifications:

• Highschool Diploma or equivalent

• Six or more (6+) years of Experience in Cyber Security, Systems Engineering or related field

• Five or more (5+) years of NIA or NSA RMF experience preparing, implementing, and ensuring compliance with cybersecurity policy, to include Assessment and Authorization requirements.

• Information Assurance (IA) Level I or higher certification (e.g., A+ CE, CCNA-Security, CND, Network+ CE, SSCP)

• Two or more years of experience with Tenable Security Center and Nessus.

• Two or more years of experience with Security Content Automation Protocol (SCAP) Compliance Checker (SCC).

• Knowledge of NIST SP 800-53 Rev 4 or Rev 5.

• Strong interpersonal skills, telephone etiquette, and professional demeanor.

• Excellent oral and written communication skills.

• Effective team player with highly proficient customer service skills.

• Flexible and able to work in a dynamic, team-oriented environment.

• Candidate must have an active DoD Top Secret Clearance with SCI access.

• Pursuant to the various government contractual requirements, all applicants must be U.S. Citizens.

Preferred Skills:

• Bachelor’s degree in Computer Science, Computer Engineering, Software Engineering, or Cybersecurityand, three or more (3+) years of experience with NIA or NSA RMF experience preparing, implementing, and ensuring compliance with cybersecurity policy, to include Assessment and Authorization requirements.

Pay Range:

The pay range for this role is $165,000-185,000 annually. This is a reasonable estimate for this role. Individual salaries are determined by a variety of factors including, but not limited to: business considerations, local market conditions, and internal equity, as well as candidate qualifications, such as skills, education, and experience.

ADA Notations:

• Regular communication (hearing/speaking).

• Noise conditions range from very quiet to very noisy.

• Prolonged use of computer (typing/keyboarding).

• Frequently required to sit for long periods of time, standing, and walking.

• Ability to travel by car, air or other means of transportation, if required.

Epsilon Systems Solutions, Inc. is an equal opportunity employer. Qualified candidates will be considered without regard to legally protected characteristics.

Equal employment opportunity, including veterans and individuals with disabilities.

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