Systems Engineer II: DoD Mission Systems & Testing

S3I Engineering; California, Northern (MD, KY); Hybrid; USD 100,000 - 215,000; Full time

Benefits offered by this job

Medical and Dental benefits

401K with Matching

Profit-Sharing Plan

Holiday and Paid Leave

Job summary

S3I Engineering, LLC seeks a Systems Engineer II to support the development, integration, testing, and analysis of DoD mission systems and related sensors. You will lead testing efforts, troubleshoot complex issues, and collaborate with government personnel across lab and aircraft environments.

The role requires independence, leadership in test events, and the ability to mentor junior engineers while delivering reliable design fixes. Travel and after-hours support are anticipated.

Qualifications

• Bachelor of Science in Engineering, Computer Science, Computer Hardware, Mathematics, Physics, or a related technical field; or equivalent experience.

Responsibilities

• Lead and execute the installation, configuration, and testing on aircraft and in government laboratories to identify technical deficiencies and provide actionable recommendations to development teams.
• Perform independent reproduction and detailed analysis of field‑reported system issues, including root cause validation.
• Provide expert input during design reviews and support requirements derivation and traceability activities.
• Collaborate directly with government personnel and partners to deliver reliable, technically sound solutions.
• Troubleshoot and isolate multi-system problems involving sensors, networks, mission software, and hardware.
• Evaluate, refine, and validate test methodologies to address gaps and ensure consistent system performance.
• Configure complex test bench systems for advanced requirements testing.
• Lead software test events, train junior staff, and guide peer engineers in technical practices.
• Prepare detailed field test reports and consolidate findings for leadership and government stakeholders.
• Support tasking outside of normal business hours (<10% annually)
• Travel to support tasking approximately 12-18 weeks annually

Skills

Linux troubleshooting

System diagnostics

Complex system troubleshooting

DoD clearance eligibility

Cross-functional collaboration

Education

Bachelor of Science in Engineering or related technical field

Tools

Git

Job description

S3I Engineering, LLC seeks a Systems Engineer II to support the development, integration, testing, and analysis of DoD mission systems and related sensors. You will lead testing efforts, troubleshoot complex issues, and collaborate with government personnel across lab and aircraft environments.

The role requires independence, leadership in test events, and the ability to mentor junior engineers while delivering reliable design fixes. Travel and after-hours support are anticipated.