Principal Engineer - Space Payloads

Please Note: To conform with the United States Government Space Technology Export Regulations, the applicant must be a U.S. citizen, lawful permanent resident of the U.S., conditional resident, asylee or refugee (protected individuals as defined by 8 U.S.C. 1324b(a)(3)), or eligible to obtain the required authorizations from the U.S. Department of State.

At Cesium Astro
, we develop and pioneer out‑of‑the‑box communication systems for satellites, UAVs, launch vehicles, and other space and airborne platforms. We take pride in our dynamic and cross‑functional work environment, which allows us to learn, develop, and engage across our organization. If you are looking for hands‑on, interactive, and autonomous work, Cesium Astro is the place for you. We are actively seeking passionate, collaborative, energetic, and forward‑thinking individuals to join our team.

We are seeking a highly skilled Space Payload Responsible Engineer (RE) to lead the design, development, integration, test, and flight qualification of advanced spaceborne payloads. The ideal candidate will have hands‑on experience with phased array systems
, RF receivers
, power and control architectures
, and spacecraft‑level interfaces
. In this role, you will serve as the technical authority for the payload, guiding multidisciplinary engineering teams from concept through on‑orbit activation.

You will be responsible for technical execution, schedule and risk management, cross‑functional coordination, and delivering a fully qualified payload to spacecraft integration. This position requires strong leadership, deep engineering knowledge, and the ability to operate in a fast‑paced mission environment.

• Serve as the Payload Responsible Engineer and primary technical point of contact for the payload throughout the mission lifecycle.
• Lead the end‑to‑end engineering effort for the payload, including architecture, design, prototyping, integration, test, environmental qualification, and flight readiness.
• Coordinate and direct a team of RF, digital, mechanical, thermal, software, and systems engineers to ensure consistent and timely technical execution.
• Develop and review payload control schemes, internal data interfaces, command & telemetry architecture, and firmware/software integration as needed.
• Oversee development and performance of phased array antennas including beamforming, calibration, and environmental considerations.
• Manage all flight qualification activities, including environmental test planning (thermal vacuum, vibration, shock, EMC), margin assessment, and final acceptance testing.
• Generate and maintain payload‑level documentation: requirements, ICDs, block diagrams, test plans, verification matrices, risk registers, and design reviews.
• Interface with spacecraft systems engineering, mission assurance, manufacturing, vendors, and test facilities.
• Drive root‑cause analysis, anomaly resolution, and technical risk mitigation throughout development and test campaigns.
• Communicate status, technical trades, risks, and design decisions to internal leadership and external customers.

• Bachelor’s degree in Electrical Engineering, Aerospace Engineering, Physics, or related technical field. (Master’s or Ph.D. preferred.)
• 9 years of engineering experience in space payload development or RF/antenna systems.
• Direct experience designing and testing phased array antennas for space or high‑reliability applications.
• Hands‑on experience with RF receivers, including front‑end architectures, down converters, filtering, and RF system modeling.
• Demonstrated understanding of payload control systems, digital interfaces, command & data handling, and embedded hardware/software interactions.
• Experience with space power systems, including DC‑DC converters, load analysis, protections, and spacecraft power interfaces.
• Proven experience executing or overseeing flight qualification and environmental test campaigns (TVAC, vib/shock, EMC, radiation considerations).
• Leadership experience, including mentoring or leading multidisciplinary engineering teams.
• Proficiency with engineering tools such as RF simulation packages…