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About Castelion

Castelion is bringing a new approach to defense development and production: one that focuses on short, iterative design cycles, rapid testing in development, and modern commercial manufacturing strategies for production at scale. Were designing, building, and testing next generation long range strike weapons systems to give America and its Allies a definitive edge and deter future conflicts.

Senior Avionics Systems Integration Engineer

Join Castelion and play a pivotal role in advancing the development of next-generation hypersonic missile systems. As a Senior Avionics Systems Integration Engineer, you'll be part of a cross-disciplinary team responsible for the seamless integration of avionics systems across design, development, testing, and operations. You'll directly impact mission-critical systems that shape national defense and peace through deterrence.

Responsibilities

• Lead the integration and operational readiness of avionics systems from initial design and assembly through testing and field operations

• Diagnose, troubleshoot, and resolve electrical hardware issues under aggressive development timelines while driving long-term improvements

• Support hardware-in-the-loop (HIL) testing, flight operations, and post-flight assessments, ensuring real-time system health monitoring and issue resolution

• Collaborate cross-functionally to optimize avionics architectures, reducing mass, cost, and complexity through innovative solutions

• Contribute to the development and validation of advanced avionics capabilities, including power systems, sensors, vehicle networks, RF, and control systems

Basic Qualifications

• Bachelors degree in engineering, physics, or a related technical field

• 5+ years of experience in electrical component design, system integration, or electronic testing

• 1+ years of experience using software tools such as MATLAB, Python, or C++
  

• Vehicle harnessing experience

Preferred Skills and Experience

• Proficiency with electrical test equipment (multimeters, oscilloscopes, power supplies, etc.)

• Creative problem-solving mindset with the ability to balance risk and make sound decisions

• Experience diagnosing and repairing avionics systems, including sensors and actuators

• Familiarity with 3D CAD tools

• Software skills to automate test or analysis processes

• Strong organizational and communication skills with the ability to thrive in a dynamic, fast-paced environment

• Real-time operations experience in complex systems such as flight tests or other high-consequence environments

Additional Requirements

• Ability to work onsite and support testing at remote facilities as needed.

• Willingness to travel occasionally to support test campaigns and customer engagements.

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. 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.