Job Description
Job Description
Position: Model Based Systems Engineer II (MBSE II)
Location: San Diego, CA (Hybrid/Remote Considered)
Clearance Requirement: Current Secret clearance required
Position Overview
XSITE LLC is seeking a Model Based Systems Engineer II to support the architecture, modeling, and digital engineering efforts across complex defense systems and System-of-Systems (SoS). This individual will play a pivotal role in modernizing how systems are designed, analyzed, and validated using model-based tools and processes in support of Department of Defense (DoD) programs.
This position requires a strong grasp of MBSE principles, experience with modeling languages like SysML/UML, and a collaborative mindset for working in cross-platform digital environments.
Core ResponsibilitiesDigital Engineering & Model Development
-
Develop, analyze, and maintain models and digital artifacts across the acquisition lifecycle—from requirements through sustainment.
-
Apply MBSE techniques to support system requirements, architecture, design, analysis, verification, and validation activities.
-
Create and maintain system-of-systems models to ensure interoperability and traceability of digital products.
-
Support the generation of deliverables consistent with Department of Defense Architecture Framework (DoDAF) or Unified Architecture Framework (UAF).
Tool & Platform Utilization
-
Use MBSE tools such as MagicDraw/Cameo, Enterprise Architect, System Architect, Rational Rhapsody, or similar platforms to develop and manage system models.
-
Generate architecture views, activity diagrams, sequence diagrams, and system behavior models to support stakeholder understanding and system definition.
Collaboration & Integration
-
Interface with systems engineers, program managers, cybersecurity, and configuration management teams to ensure a unified digital engineering thread.
-
Contribute to the implementation of a model-based culture across the organization and support digital enterprise initiatives.
-
Generate reports and briefings that support MBSE activities and inform technical and programmatic decisions.
Required Qualifications
-
Current Secret clearance (must be active and verifiable).
-
Bachelor’s degree in Engineering, Operations Research, Mathematics, Physics, or another science/technical discipline involving advanced mathematical concepts.
-
Strong understanding of model-based systems engineering principles and methodologies.
-
Familiarity with MBSE lifecycle integration in support of government acquisition programs.
Desired Qualifications
-
3+ years of professional experience performing Model Based Systems Engineering within a DoD environment.
-
Experience applying MBSE throughout the acquisition lifecycle, including requirements, analysis, design, V&V, and sustainment.
-
Working knowledge of SysML and/or UML.
-
Experience with MBSE tools such as:
-
Cameo Systems Modeler / MagicDraw
-
Sparx Systems Enterprise Architect
-
IBM Rational Rhapsody
-
-
Knowledge of DoDAF and/or UAF for generating architecture views and integrating digital threads across domains.
-
Experience working in environments promoting the use of digital engineering and model-based culture.
Why XSITE LLC?Best-in-Class Benefits & Work-Life Balance
-
100% employer-paid health, dental, and vision coverage.
-
401K with a 6% match.
-
Industry-leading PTO package.
-
Continuing education reimbursement.
-
Hybrid onsite/remote work environment.
Stability & Long-Term Growth
-
XSITE holds multiple prime contracts and maintains a strong mentor-protégé JV with a major defense contractor, offering long-term project stability.
Career Advancement
-
As a fast-growing SDVOSB with 300% year-over-year growth, XSITE offers unparalleled opportunities for advancement, leadership, and involvement in cutting-edge programs.
Apply Today!
If you're passionate about digital transformation, model-driven systems thinking, and national defense, we welcome your application to become part of the XSITE team.