Weapons Integration Engineer

About Castelion

Castelion brings a new approach to defense development and production: short, iterative design cycles, rapid testing, and modern commercial manufacturing strategies for production at scale. We design, build, and test next-generation long-range strike weapons systems to give America and its Allies a decisive edge and deter future conflicts.

Weapons Integration Engineer

As a Weapons Integration Engineer you will be part of the team that ensures Castelion weapon systems integrate seamlessly with ground launchers, tactical/multi-role aircraft, and future systems. You will own platform integration efforts from early concept and capability studies through prototype development, test, and operational deployment - collaborating with propulsion, avionics, GNC, software, flight test, and manufacturing teams to deliver mission-ready solutions.

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.

Basic Qualifications

• Bachelors 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.

Preferred Skills and Experience

• Masters degree in a relevant technical field.
• Hands-on experience with hypersonic weapons, missile defense, or platform integration
• Strong background in mission design, development, integration, and test for missiles, spacecraft, or similar systems.
• Demonstrated success integrating weapons or sensors with tactical aircraft and/or ground-based launch systems.
• Active Top Secret/SCI clearance preferred.

Leadership Qualities

• Bias to Action and Creative Problem Solving. Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. The ability to personally resolve minor issues in development without requiring significant support.
• High Commitment, High Initiative. A successful candidate will have a genuine passion for Castelion's mission and consistently look for ways to contribute to the company's technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity.
• Clear Communicator. Proactively communicates blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity.

ITAR Requirements:

• To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State.

Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

All employees are granted long-term stock incentives as part of their employment as Castelion. All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers four weeks of paid time off per year.