EMI EMC Engineer

Why Castelion, Why Now Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability. This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function. EMI EMC Engineer We are hiring an EMI/EMC Engineer to own electromagnetic compatibility across our avionics hardware stack. This role is responsible for ensuring that avionics electronics, including flight computers, sensors, communications systems, and power electronics, operate reliably without causing or suffering from electromagnetic interference. Responsibilities • Integrate EMI/EMC considerations early into avionics hardware design, working closely with PCB designers and hardware engineers • Review schematics and PCB layouts to ensure proper grounding, filtering, shielding, and return path integrity • Develop mitigation strategies including filtering, cable shielding, bonding, and enclosure design • Support system-level EMI risk analysis and identify potential interference sources across avionics subsystems • Plan and execute EMI/EMC validation testing including radiated and conducted emissions and susceptibility testing • Troubleshoot electromagnetic interference issues at the board, cable harness, and system levels • Analyze test data to identify root causes of EMI issues and drive corrective design actions • Collaborate with avionics test engineers to build and refine test setups for EMI validation • Develop internal design guidelines and best practices to reduce EMI risk in future hardware iterations • Document test results, mitigation strategies, and engineering recommendations Basic Qualifications • Bachelor's degree in Electrical Engineering or related field • Hands-on experience with EMI/EMC testing, troubleshooting, or mitigation in electronic hardware systems • Strong understanding of grounding, shielding, filtering, and electromagnetic coupling mechanisms • Experience using lab instrumentation such as spectrum analyzers, oscilloscopes, signal generators, and current probes • Ability to diagnose hardware interference issues and translate findings into practical design improvements • Experience working closely with electrical hardware or PCB design teams • Strong troubleshooting and problem-solving skills in lab environments • Ability to work cross-functionally with hardware, test, and manufacturing teams Preferred Skills and Experience • Experience supporting EMI/EMC compliance testing such as MIL-STD-461 or DO-160 • Familiarity with avionics, RF systems, or high-speed digital electronics • Experience working with cable harnessing, connectors, and shielding strategies in aerospace systems • Experience debugging EMI issues at board, subsystem, or platform level • Experience collaborating with external EMI compliance laboratories • Familiarity with PCB design tools such as Altium or similar ECAD tools • Experience with electromagnetic modeling or simulation tools Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice. Additional Eligibility Requirements This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply. Affirmative Action/EEO Statement Castelion is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law. Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact hr@castelion.com. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law. Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation. EAR/ITAR Requirements This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.