Systems Engineer I — Mission Systems and Sensors

Job overview

The Systems Engineer I — Mission Systems and Sensors role is onsite in Lexington Park, MD, with a Monday–Friday, 8:00 a.m.–5:00 p.m. flexible schedule. The salary range is $90,000–$130,000 per year. S3I Engineering provides specialty engineering, systems integration, and operational support to U.S. government agencies, including support for the U.S. Navy. The engineer supports development, integration, testing, and analysis of mission systems and sensors deployed across Department of Defense platforms. The role assists with configuration, troubleshooting, test execution, and documentation to help validate system behavior and support mission readiness.

What you'll do

• Assist with installation, configuration, and testing of mission systems and sensors
• troubleshoot using Linux command-line tools
• configure test benches
• help reproduce and document system anomalies
• participate in design reviews under supervision
• prepare field test reports and notes
• follow DoD and DCSA cybersecurity practices
• support government stakeholders
• provide tasking outside normal hours as needed
• travel approximately 12–18 weeks annually.

What we're looking for

Skills & competencies

systems engineer i

lexington park md

s3i engineering

$90k–$130k

mission systems

sensors

linux

system integration

test engineering

dod

ts/sci eligibility

12–18 weeks travel

medical and dental

Work arrangement

• Weekend coverage required

Benefits & perks

• Medical and dental benefits
• holiday and paid leave
• 401(k) with matching
• profit-sharing plan.

Why this role

The posting requires U.S. citizenship and eligibility for a TS/SCI clearance, and the ability to obtain DoD 8570/8140 compliance within six months. Travel is approximately 12–18 weeks per year; outside-hours support is less than 10% annually.

About the employer

S3I Engineering is hiring for this role. Industry: Engineering Services. Sector: 54.