Senior Spacecraft Systems Engineer - Payload

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 are developers and pioneers of 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.

The Senior Spacecraft Systems Engineer – Payload is responsible for leading the systems engineering activities required to define, develop, integrate, verify, and support complex aerospace systems throughout the product lifecycle. This role translates mission objectives, customer requirements, and system architecture into technical solutions that enable successful system integration and mission execution.

Working within a multidisciplinary engineering environment, the Senior Systems Engineer collaborates with software, hardware, mechanical, electrical, manufacturing, integration and test, mission operations, and program management teams to ensure systems meet technical, operational, cost, and schedule objectives. This role provides technical leadership from concept development through design, integration, verification, launch, and operational support while contributing to technical decision‑making and risk management.

• Analyze customer, mission, and system‑level requirements and decompose them into clear, verifiable system and subsystem requirements.
• Establish clear definitions for all hardware and software interfaces between the payload and the space vehicle
• Ensure requirements maintain end‑to‑end traceability to customer requirements, system architecture, and Concept of Operations (CONOPS).
• Define and manage hardware, software, electrical, mechanical, and data interfaces between system elements.
• Collaborate with cross‑functional engineering teams to refine requirements for completeness, feasibility, technical accuracy, and manufacturability.
• Support requirements management, configuration management, baseline control, and engineering change activities.
• Identify technical risks, requirement gaps, ambiguities, and design issues early in the development lifecycle.
• Support system architecture development, technical trade studies, and engineering analyses to evaluate design alternatives and optimize system performance.

• Develop system verification and validation strategies, including verification methods (test, analysis, demonstration, and inspection), acceptance criteria, and verification levels aligned with program requirements.
• Define verification configurations, including hardware, software, firmware, and test environments required to support verification activities.
• Develop and maintain verification documentation, verification cross‑reference matrices (VCRM), requirements traceability matrices, and verification evidence packages.
• Partner with Integration & Test teams to plan, coordinate, and support system integration and verification activities.
• Evaluate test results, resolve technical discrepancies, and support corrective actions to ensure compliance with system requirements.

• Support technical planning, Program Increment (PI) planning, staffing assessments, and engineering execution activities.
• Prioritize systems engineering activities to meet technical, cost, schedule, and program milestones.
• Participate in technical reviews, design reviews, customer meetings, and engineering milestone activities.
• Mentor junior engineers on systems engineering best practices, requirements development, traceability,…