Senior Field Service Engineer; FSE

About Epirus

Epirus is a high-growth technology company developing solid-state, software-defined directed energy systems that enable unprecedented counter-electronics effects and power management solutions to optimize power efficiency in defense and commercial applications. With a constant emphasis on innovation, we are redefining the future of power to bring tomorrow’s capabilities to life, today. And that’s just the beginning.

Job Summary: Epirus is seeking a Field Service Engineer (FSE) III with the ability to provide advanced technical support, troubleshooting, and operational oversight in support of Epirus High Power Microwave Counter Unmanned Aerial Systems (HPM-CUAS). This individual will work as a member of a small team with a primary focus on the maintenance, training support and sustainment of fielded HPM assets.

The FSE will directly support the maintenance of the fielded HPM-CUAS equipment, re-installation of Line repairable units (LRUs), training, integration, and sustainment of these solutions with existing client infrastructure at CONUS and OCONUS locations. Candidate will provide hands‑on support for HPM-CUAS technical, network, and integration projects. This role requires hands‑on expertise in electrical, mechanical, and software systems, as well as the ability to work in high-pressure situations supporting defense operations.

This position requires a high degree of technical skill, personal resilience and flexibility, strong interpersonal skills, and the ability to work as part of a cross‑functional team in a variety of physical environments.

• Work closely with engineering teams to provide feedback on system performance and potential design improvements.
• Coordinate with project managers, logistics personnel, and customers to ensure timely resolution of issues.
• Conduct install/uninstall of HPM-CUAS systems in a variety of locations / environmental conditions to support client operations, test and evaluations, Tactics, Techniques and Procedure (TTP) / Doctrine development, and New Equipment Training (NET) courses.
• Make recommendations on equipment modifications/upgrades based on experience gained through testing and operational use of HPM-CUAS systems.
• Deploy overseas locations to perform technical inspections, system checks, fault diagnosis, identify cause of failures, and replace Line Repairable Unit (LRU), test and restore HPM-CUAS systems to full functionality.
• Conduct advanced programming of HPM-CUAS systems (install/upgrade firmware, software upgrades, etc.).
• Work with the Epirus training and enablement team to develop and conduct training on the proper care, use, maintenance, and preventive maintenance of systems.
• Work closely with engineering teams to provide feedback on system performance and potential design improvements.

• Bachelor’s degree in Electrical Engineering, Mechanical Engineering, Physics, or a related technical field AND minimum 5 years of related experience (or 3 years and a Master’s degree).
• Proficiency in troubleshooting and repair of electronic and mechanical systems.
• Knowledge of high‑power RF generation, wave propagation, and directed energy principles.
• Familiarity with test equipment (oscilloscopes, spectrum analyzers, RF power meters, etc.).
• Strong technical writing and verbal communication skills.
• Ability to provide technical advice and guidance on installation, adaptation, configuration and/or enhancement of company technical products, programs, and systems.
• Candidate must hold a valid U.S. passport or have the ability to obtain a U.S. passport.
• Current SECRET security clearance is required.
• Military experience with CUAS Systems (RF Detection, Radar, EO/ IR Optical systems, Command and Control (C2) Systems).
• Experience working in field operations, including deployment in austere or challenging environments.
• Experience working independently or as a team member, to solve project and/or engineering problems.
• Ability to use and communicate a wide variety of technical data from OEM manuals, engineering drawings, etc. to engineers as well as to non‑technical system end users.
• The position requires daily interaction with customers at…