
Cyber System Security Engineer
El Segundo, CAFull-timeSeen 2 days agoSeen in employer's feed 2 days ago
Most applications go out cold — see where you stand first. No sign-up to start.
Watch jobs like this. New roles like this one near El Segundo, CA, by email.
Don't just apply. Show up ready.
Olive works from this exact posting.
At a glance
Olive lists jobs from US employers, including remote roles you can work from the United States.
Requirements
Credentials this posting asks for.
Job overview
MANTECH seeks a Cybersecurity System Security Engineer (CSSE) - III to support Special Access Programs for SSC and AFSPC acquisition programs in El Segundo. The role provides technical support across Collateral, SCI, and SAP activities, ensuring systems meet NIST cybersecurity requirements for assessment and authorization. The engineer leads security teams, advises customers, supports system reviews and testing, and works with approval authorities to obtain Authorization to Operate.
Skills & qualifications
Skills
Qualifications
Full job description
MANTECH seeks a motivated, career and customer-oriented Cybersecurity System Security Engineer (CSSE) - III to join our team in El Segundo, CA .
In this role, you will provide critical support within Special Access Programs (SAPs) supporting SSC and AFSPC acquisition programs. You will deliver daily technical support across Collateral, Sensitive Compartmented Information (SCI), and SAP activities to ensure systems meet essential NIST Cybersecurity requirements for system assessment and authorization in a full-time, on-site environment.
Responsibilities
-
Lead a team of System Security Engineers and Certification Analysts ensuring customer national and international security interests are protected during acquisition system design and testing.
-
Chair and co-chair customer and SAP community Cybersecurity working groups while actively participating in Systems Security Engineering IPT reviews.
-
Perform oversight for the development, implementation, and evaluation of information system security program policies with emphasis on SAP network infrastructures.
-
Provide expert-level consultation and technical services on all aspects of Information Security and system designs.
-
Develop and provide Cybersecurity risk management recommendations, Program Protection Plans, and Cybersecurity Strategies to the customer.
-
Assist with site activation activities, design reviews, and test and evaluation of systems.
-
Work directly with approval and accreditation authorities to successfully obtain systems' Authorization to Operate (ATO).
Minimum Qualifications
-
Bachelor’s degree in a related discipline an additional 4 years of related experience may be accepted in lieu of degree.
-
12+ years of total experience, including a minimum of 8 years of experience within an SCI or SAR environment.
-
4 years of direct Special Access Program (SAP) relevant experience.
-
Must meet DoD Directive 8570.01-M/8140 requirements for Information Assurance Technician (IAT) Level 3 and Information Assurance Manager (IAM) Level 3 within 6 months of hire. CISSP Recommended.
-
Full understanding of Risk Management Framework (RMF) and Joint SAP Implementation Guide (JSIG) processes for system accreditation.
Preferred Qualifications
-
Familiarity with DoD security policies, manuals, and appropriate ICDs, JAFANs, and related guiding policy documents.
-
Proven ability to work in a dynamic environment and effectively interact with DoD, military, civilian, and industry partners.
-
Strong working knowledge of Microsoft Office applications including Word, PowerPoint, and Excel.
-
Possess a high degree of originality, creativity, and initiative while requiring minimal supervision.
Clearance Requirements
-
Current Top-Secret Clearance with SCI Eligibility.
-
Must be eligible for access to Special Access Programs (SAP).
-
Willingness to submit to a Counterintelligence polygraph.
Physical Requirements
-
Must be willing to travel within the organizational Area of Responsibility (AOR), including both air and ground transportation.
-
Person in this position may remain in a stationary position 50% of the time in closed-area offices.
-
Must be able to occasionally move about inside and outside of the office to access files, cabinets, and safes, or install and remove computer-related equipment.
MANTECH International Corporation considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.
If you need a reasonable accommodation to apply for a position with MANTECH, please email us at [email protected] and provide your name and contact information.
How this job compares
Set against the 1,563 open Cybersecurity Engineer jobs on Olive Jobs, counted October 27, 2026.
- Pay
- This postingNot listed
- California median$116–200K/yr96 salary ranges
- US median$60–69/hr24 hourly ranges
- Openings
- Olive Jobs lists 110 open Cybersecurity Engineer jobs in California and 1,563 across the US. 3% of them nationwide are listed as remote or flexible.
- Experience
- This posting asks for at least 12 years of experience — more than three in four Cybersecurity Engineer postings that state a minimum ask for (median 5 years, across 1,451 postings).
- Education
- 635 of the 1,563 open Cybersecurity Engineer jobs (41%) ask for a bachelor's degree or higher.
Counted across the open, public US postings on Olive Jobs on October 27, 2026. Pay medians are the middle values of the low ends and of the high ends of postings that list both ends of a range in the same cadence (a yearly salary or an hourly rate); a range's midpoint is halfway between its ends. Pay and experience figures resting on fewer than 20 postings are left out.
Similar jobs, posted recently
Open roles like this one, listed in the last 30 days.
Senior Cybersecurity EngineerTrinzic · El Segundo, CA · $149–187K/yr
Senior Systems Security Engineer - P3 (Onsite-El Segundo, CA)RTX Corporation · el segundo, CA · $96–182K/yrPosted 2w agoPosted 2w ago
Classified Cybersecurity Analyst 3/4 - TS/SCINorthrop Grumman · Manhattan Beach, CA · $114–171K/yrSenior Cybersecurity Engineer, Product SecurityChaos · El Segundo, CA · $135–200K/yrPosted 2w agoPosted 2w ago
Senior Spacecraft Avionics Security Engineer - Millennium Space SystemsThe Boeing Company · El Segundo, CA · $146–230K/yrPosted 2w agoPosted 2w ago
You've read the whole posting — now see how you match it.