Model Based Systems Engineer II chez XSITE LLC

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 Responsibilities

Digital 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.