Model‑Based Systems Engineer

Piper Companies is seeking a Model-Based Systems Engineer (Level 3) to join an advanced aerospace engineering team in St. Louis, MO (Berkeley site). This role is 100% ONSITE. The Systems Engineer will be responsible for developing system architectures, building SysML models, and managing requirements to support next-generation aircraft, weapons systems, and air dominance programs. This position requires strong Systems Engineering experience, hands-on MBSE/SysML modeling, proficiency with DOORS, and the ability to collaborate across multidisciplinary engineering teams to deliver accurate, integrated, and testable system solutions.

Responsibilities of the Model-Based Systems Engineer (Level 3):

• Develop and maintain SysML models using MBSE tools such as Cameo or MSOSA

• Translate high-level system requirements into detailed, traceable subsystem requirements

• Use DOORS to manage, organize, and maintain requirement baselines and traceability

• Partner with architects, software engineers, hardware teams, and mission systems experts to design and integrate complex system solutions

• Support system architecture definition, interface management, and integration planning

• Participate in trade studies, risk assessments, and milestone technical reviews

• Contribute to verification and validation (V&V) planning for mission-critical and safety-critical systems

• Document system behaviors, relationships, and architecture elements within the MBSE environment

• Work closely with engineering leadership and Subject Matter Experts to ensure consistent application of Systems Engineering best practices

Qualifications for the Model-Based Systems Engineer (Level 3):

• Bachelor's degree in Engineering, Physics, Computer Science, Mathematics, or related field

• 5+ years of engineering experience

• 4+ years of Systems Engineering experience

• Hands-on experience with SysML modeling tools (Cameo, MSOSA, or equivalent)

• Experience using DOORS for requirements management and traceability

• Background supporting aerospace, defense, avionics, weapons systems, or other highly complex systems

• Experience with system architecture, interface control, decomposition, and verification planning

• Strong analytical, organizational, and communication skills

• Must be able to obtain a Secret Clearance (active Secret within 24 months preferred)

Preferred Skills:

• Experience with tactical aircraft, mission systems, avionics, or weapons systems

• Experience with software requirements, test planning, or certification activities (safety-critical or mission-critical systems)

• Experience using Jira and Confluence

• Familiarity with airworthiness processes or military standards

Compensation for the Model-Based Systems Engineer (Level 3):

Bill Rate: $77.40 - $96.92/hour

Target Pay Rate: ~$57.69/hour

Potential Conversion Salary: ~$120,000

Benefits: 11 paid holidays, 10 PTO days (contract)

Location: 100% ONSITE in St. Louis, MO (Berkeley site)

This role opens for applications on 3/11/2026. Applications will be accepted for at least 30 days.

Keywords:

Model-Based Systems Engineer, MBSE, Systems Engineer, SysML, Cameo, MSOSA, DOORS, Systems Architecture, Requirements Engineering, Avionics, Aircraft Systems, Mission Systems, Defense Engineering, Verification & Validation, Integration Engineering, Air Dominance, Phantom Works, Safety-Critical Systems, St. Louis MO, Berkeley MO, Onsite

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