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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