Weapons Integration Engineer – Mission Systems & Test

Castelion; Torrance (CA); On-site; USD 140,000 - 190,000; Full time

Benefits offered by this job

Equity participation

Paid time off (4 weeks)

Holidays (10)

Health benefits

Parental leave

Fitness stipend $100/month

EV charging on site

Catered meals

Job summary

Castelion in Torrance, CA is seeking a Weapons Integration Engineer at multiple levels to join a fast-moving defense program. You will own platform integration from concept to deployment, coordinating with propulsion, avionics, GNC, software, flight test, and manufacturing to deliver mission-ready weapon systems onsite.

This role requires a Bachelor's in engineering, 2+ years in defense systems, and ability to obtain TS/SCI clearance.

Qualifications

• Bachelor's degree in aerospace, mechanical, electrical engineering, physics, or related technical field.
• 2+ years experience in systems engineering, mission/weapon integration, or related roles within defense or aerospace.
• 2+ years experience in technical project management or weapons system development.
• Hands-on experience with launch vehicles, weapons systems, system integration, or aerospace defense platforms.
• Experience working with the DoD or other national security agencies.
• Strong analytical skills: ability to synthesize complex technical information and communicate effectively to engineers and non-technical stakeholders
• Ability to obtain and maintain Top Secret/SCI clearance
• Ability to travel up to 25% for customer meetings, test campaigns, and program execution

Responsibilities

• Serve as the primary technical liaison between Castelion and government customers, platform manufacturers, and other external stakeholders to ensure alignment between mission requirements and system designs.
• Support development of advanced weapon concepts and technologies, with emphasis on missile integration for ground launchers and tactical aircraft.
• Develop, maintain, and execute fast-paced integration plans and schedules to deliver and field weapon systems.
• Lead mission planning, verification, and test efforts (including live-fire and flight tests): pre-test analysis, real-time mission support, and post-test evaluation and reporting.
• Review and assess interface specifications, drawings, and design documents for functional, electrical, software, and physical interfaces; identify and close interface gaps.
• Collaborate across internal engineering teams (propulsion, avionics, GNC, software, flight test, manufacturing) to perform design trades and optimize overall system performance with a focus on platform compatibility.
• Develop and coordinate technical specifications, integration documentation, and certification/supporting artifacts required for customer acceptance and regulatory compliance.
• Represent Castelion at customer meetings, design reviews, test campaigns, and demonstrations.
• Ensure contract deliverables meet customer requirements, schedule, and quality standards.

Skills

Clearance TS/SCI

Strong analytical skills

Willingness to travel

Technical liaison

Education

Bachelor's degree in aerospace, mechanical, electrical engineering, physics, or related field

Master's degree in a relevant technical field

Job description

Castelion in Torrance, CA is seeking a Weapons Integration Engineer at multiple levels to join a fast-moving defense program. You will own platform integration from concept to deployment, coordinating with propulsion, avionics, GNC, software, flight test, and manufacturing to deliver mission-ready weapon systems onsite.

This role requires a Bachelor's in engineering, 2+ years in defense systems, and ability to obtain TS/SCI clearance.