Demo

Cyber Security Engineer

Modern Technology Solutions, Inc. (MTSI)
El Segundo, CA Full Time
POSTED ON 4/16/2026
AVAILABLE BEFORE 5/24/2026
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

  • 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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Salary : $110,000 - $150,000

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