Systems Engineer II

Job Description

Job Description

S3I Engineering provides specialty engineering services, systems integration, and operational support to US Government agencies.  Our technical expertise covers multiple facets of the Software, Systems, Cyber, and Hardware Engineering disciplines.  Our engineers have expert knowledge of the critical mission management systems and their deployment on various DOD, DHS, and other platforms.

S3I is currently looking for entry and mid-level Systems Engineers. You will be working with cutting-edge technology to test complex mission management systems and their sensors.  From testing capabilities to optimizing performance and reliability, your expertise will play a pivotal role in ensuring mission success. If you love to solve hard complex problems and are willing to embrace the challenge, embark on a career where every day brings new opportunities to push the boundaries of what is possible.  Join us and be a part of shaping the future. 

Job Title : Systems Engineer II
Work Schedule : M-F, 8AM-5PM, Flexible
Job Classification : Exempt
Primary Location : Lexington Park, MD

Travel: 12-18 weeks per year
Salary Range : $100,000 to $215,000 depending on experience and skill set

Position Description: Systems Engineer II

Position Summary
The Systems Engineer II provides experienced engineering expertise supporting the development, integration, testing, and analysis of complex DoD mission systems, advanced sensors, and integrated software architectures. This role requires independent investigation, advanced troubleshooting, leadership in test events, and collaborative engagement with government personnel. This work requires deeper technical knowledge to support a small team during laboratory and field test activities in government labs and aircraft environments.

Key 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

Required Qualifications

• Bachelor of Science in Engineering, Computer Science, Computer Hardware, Mathematics, Physics, or a related technical field; or equivalent experience.
• Strong experience with Linux-based troubleshooting, system diagnostics, and complex system configuration across separate interdependent projects.
• Demonstrated expertise in reverse engineering system behavior to support troubleshooting, testing, and diagnostic workflows.
• Ability to obtain DoD 8570/8140 compliance by certification or education within 6 months of starting.
• Experience with DoD sensor systems (EO/IR, Radar, SIGINT, etc.) and mission systems deployed on one or more DoD platforms.
• Highly articulate communication skills for conveying complex technical behaviors and system interactions.
• US Citizenship and eligibility for TS/SCI clearance.
• Ability to access government facilities and travel between office and government sites as required.

Desired Qualifications

• Strong software troubleshooting experience and familiarity with software development in Linux environments.
• Proficiency with Git or other software configuration management tools.
• Prior Minotaur system experience is strongly desired.
• Ability to assess and troubleshoot complex, interconnected system issues.
• Experience working within DoD cloud environments such as IL5 or higher.

Physical Requirements

• Must be able to lift and carry approximately 40 lbs.
• Must be able to maneuver in confined spaces.
• Must be able to access government locations, facilities, and vessels.