Demo

Model-Based Systems Engineer

Apex Systems
San Antonio, TX Full Time
POSTED ON 10/22/2026
AVAILABLE BEFORE 11/21/2026
Job#: 3047550

Job Description:


We are seeking a highly skilled and motivated Systems Engineer to join our dynamic engineering team. This role involves serving as a Model-Based Systems Engineer (MBSE) on a team dedicated to the development of a new solution operating in a multi-level security environment. The position requires expertise in Systems Engineering with an emphasis in Cybersecurity.

Essential Duties:
  • Work within the Systems Engineering Group to provide technical decisions and guidance to enable timely, high quality product deliveries and flight test events that meet mission Cyber requirements
  • Partner and collaborate with other program systems engineers across Integrated Product Teams to accomplish program cyber requirements and meet mission objectives
  • As a member of a team of specialized systems engineers, support the development and enhancement of Launch and Missile Defense systems
  • Ensure weapon system compliance with all contractually obligated cybersecurity standards and guidance, including but not limited to CNSSI 1253, DoD 8570, DoD 8510, and AFI 17-101
  • Propose and design cyber systems architecture changes with traceability to requirements
  • Provide cyber implementation guidance and oversight across technical teams
  • Develop and document technical standard engineering processes and procedures as needed
  • Participate in engineering reviews of technical requirements, design and implementation plans prior to development of computer systems, digital communications systems, networking devices, computer architectures
  • Perform cyber-attack surface analysis of system designs with recommendations to mitigate and reduce risk
  • Participate in cybersecurity assessment activities and review cybersecurity assessment methods, plans, procedures, reports and security penetration test planning and execution.
  • Provide input to program milestones and metrics, adhering to cybersecurity-relevant plans and schedules
  • Identify problems and research technical solutions to resolve these problems
  • Apply analytical and evaluative methods and techniques to issues or studies concerning the efficiency and effectiveness of Cyber Security implementation
  • Solve complex problems across disciplines in an Agile, DevSecOps environment
  • Support program engineering review boards

Basic Qualifications
  • A current active Secret clearance is required to be considered
  • The ability to obtain and maintain a Top-Secret clearance.
  • Able to obtain, within six months of hire, an IASAE II certification (CISSP preferred) in accordance with DoDI 8570/8140
  • Comprehension of systems engineering principles, theories and concepts.
  • Experience applying Model Based Systems Engineering to develop and model requirements
  • Experience managing requirements or systems engineering artifacts using tools such as DOORS, Cameo, or JIRA.
  • Direct experience in one or more of the following Systems Engineering activities: system requirements decomposition/derivation/flow down/traceability, architecture, high-level/detail design, implementation, integration and test, and/or verification & validation.

Preferred Qualifications
  • Demonstrated experience developing system architectures for complex aerospace vehicles or subsystems using MBSE (SysML)
  • OMG SysML Model User Certification
  • IASAE level III certified (ISSEP, ISSAP) in accordance with DoDI 8570/8140
  • Top Secret/SCI Security Clearance with additional preference for SAP briefing on the Sentinel program.
  • Direct experience supporting the development of RMF assessment authorization artifacts development to satisfy NIST SP 800-37 requirements.
  • Knowledge of Cyber Security systems engineering practices, network technologies, DoD system development life cycles and methodologies, and insight into information technology infrastructure management/monitoring and applications
  • Experience innovating in Cybersecurity Accreditation processes and procedures in a multi-certification (Cyber, Nuclear Surety, etc.) context as part of a Digital Engineering Environment
  • Experience in a Systems Engineering role with responsibilities in the planning, designing, implementation, testing, and delivery of a system with Cyber/Information Assurance requirements
  • Experience managing and directing efforts following an Agile and DevSecOps process model
  • Ability to calmly negotiate challenging program requirements, strategies, and conflicting constraints among a large and diverse group of program stakeholders.


Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico.

Everforth Apex uses a virtual recruiter as part of the application process. Click for more details. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at

Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6 months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Everforth Apex team member can provide.

Everforth Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.

If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at or . Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered.

UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex Systems.

Salary : $60 - $75

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