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Cyber Security Engineer

Modern Technology Solutions, Inc.
$110,000.00 - $150,000.00 / yr
401(k)
United States, California, El Segundo
Dec 17, 2025
Modern Technology Solutions, Inc. (MTSI) is seeking a Cyber Security Engineer to join our Evolved Strategic Systems (ESS) program in El Segundo, CA. Due to security requirements, work is required to be on-site in a secure facility.
The MILSATCOM Systems Engineering, Integration, and Test (MSEIT) effort provides leading edge Systems Engineering & Integration (SE&I) for the Space Force's Space Systems Command. We support the Space Force's acquisition of state-of-the-art Military Satellite Communications systems, providing global secure, survivable, and protected communications for our nation's warfighters. We seek technical individuals who will thrive in a highly collaborative work environment of small teams, using the most modern tools and methodologies to tackle the challenges of integrating complex space and ground communications systems.
Key Responsibilities:
  • Lead SE&I Futures technical baseline and technology development for space systems command MILCOMM Program Executive Office
  • Perform systems engineering activities in the areas of cybersecurity, Risk Management Framework (RMF) Assessment & Authorization (A&A) in accordance with DoDI 8510.01
  • Perform cryptographic System Security Engineering (SSE) in compliance with NSA requirements and regulations
  • Define security requirements, architecture, and design for embedded and large-scale, distributed DoD space and ground control systems
  • Apply risk management concepts to mitigate vulnerabilities in system security architectures
  • Interface with the Space Force customer, system stakeholders, and external contractors to coordinate cybersecurity and cryptographic requirements and architecture flow down from the system level to individual elements of the system
  • Support integration activities of cybersecurity for space and ground networks
  • Participate and propose inputs for verification and validation of cybersecurity requirements
  • Perform cybersecurity planning and scheduling for RMF and coordinate efforts to categorize and assign impact values for confidentiality, integrity, and availability of systems per CNSSI 1253 to produce a tailored set of RMF security controls per NIST 800-53
  • Provide critical inputs to the Program Protection Plan and assist in identification of Critical Program Information (CPI)/Critical Components (CC)
  • Provide critical inputs to Cybersecurity Strategies and assist government with milestone approvals
Work Environment:
  • Location:On-site
  • Travel Requirements:Minimal
  • Working Hours:Standard
Qualifications:
Required:
  • Ability to obtain a DoD Secret security clearance is required to be considered for this position
  • BS in technical field, such as engineering, mathematics, physics, or computer science. An equivalent technical degree (such as MS in technical field, such as engineering, mathematics, physics, or computer science)
  • 2+ years of work experience in System Engineering Architecture/Design
  • 2+ years of work experience in Information Assurance (IA)/Cyber Security
  • Provide cybersecurity inputs to the Test and Evaluation Master Plan (TEMP) and coordinate Cybersecurity Test and Evaluation (T&E) requirements/activities (e.g., CVI, ACD, CVPA, AA) with stakeholders
  • Lead Mission Based Cybersecurity Risk Assessments (MBCRA) (e.g., MRAP-C, CTT) events and provide Mission Impact Analysis and recommendations to the program office
  • Understanding of the discipline and practice of Systems Engineering throughout the system lifecycle phases of concept, development, production, use, support, and retirement
  • Understanding of modern computing architectures including CI/CD, microservices, cloud, and container technologies
  • Proficient with Microsoft Office products (Word, Excel, Powerpoint)
  • Strong interpersonal, organizational, and teambuilding skills
  • Strong writing and oral presentation skills; ability to write final-version deliverable technical documents and reports
  • Background in software design
Desired:
  • BS or MS degree in IA/Cyber security
  • Master's degree in technical field, such as engineering, mathematics, physics, or computer science
  • Experience working on DoD programs
  • Proficient understanding of RMF process
  • Familiarity with Cybersecurity Requirements Verification and Validation (IV&V)
  • Familiarity with NIST 800-53 and CNSSI 1253 RMF Analysis and Accreditation
  • Familiarity with Network Engineering
  • Familiarity with Communications Systems
  • Familiarity with Security Test and Evaluation (ST&E)
  • Security certification (CISSP)
  • TS/SCI clearance
Additional Requirements:
  • Due to security requirements, work is required to be on-site in a secure facility
Compensation: The pay range for this position in California is $110,000/year to $150,000/year; however, base pay offered may vary depending on established government contract ranges, job-related knowledge, skills, and experience, and other factors. MTSI also offers a full range of medical, financial, and other benefits, dependent on the position offered. Base pay information is based on market location. Applicants should apply via MTSI's internal or external careers site.
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  • Interesting Work:



    Our co-workers support some of the most important and critical programs to our national defense and security.






  • Values:



    Our first core value is that employees come first. We challenge our co-workers to provide the highest level of support and service, and reward them with some of the best benefits in the industry.






  • 100% Employee Owned:



    We have a stake in each other's success, and the success of our customers. It's also nice to know what's going on across the company; we have company wide town-hall meetings three times a year.






  • Great Benefits - Most Full-Time Staff Are Eligible for:





    • Starting PTO accrual of 20 days PTO/year + 10 holidays/year


    • Flexible schedules


    • 6% 401k match with immediate vesting up to $9k annually


    • Semi-annual bonus eligibility (July and December)


    • Company funded Employee Stock Ownership Plan (ESOP) - a separate qualified retirement account


    • Up to $10,000 in annual educational reimbursement


    • Other company funded benefits, like life and disability insurance


    • Optional zero deductible Blue Cross/Blue Shield health insurance plan







  • Track Record of Success:



    We have grown every year since our founding in 1993.




Modern Technology Solutions, Inc. (MTSI) is a 100% employee-owned engineering services and solutions company that provides high-demand technical expertise in Digital Transformation, Modeling and Simulation, Rapid Capability Development, Test and Evaluation, Artificial Intelligence, Autonomy, Cybersecurity and Mission Assurance

MTSI delivers capabilities to solve problems of global importance. Founded in 1993, MTSI today has employees at over 20 offices and field sites worldwide.

For more information about MTSI, please visit www.mtsi-va.com

MTSI embraces nine core values including our first core value of Employees come first. Consistent with our Core Values, we are committed to Equal Opportunity, making decisions without regard to race, color, religion, sex, national origin, age, military/veteran status, disability, or any other characteristics protected by applicable law. MTSI is committed to Equal Employment Opportunity and providing reasonable accommodations to applicants and employees with physical and/or mental disabilities.


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