Riverside Research is an independent National Security Nonprofit dedicated to research and development in the national interest. We provide high-end technical services, research and development, and prototype solutions to some of the country’s most challenging technical problems. All Riverside Research opportunities require U.S. Citizenship. We are hiring a senior Electro-Optical (EO) Systems Engineer to support the development, modeling, testing, and fielding of advanced EO and infrared (IR) sensing systems and reconnaissance payloads for national security applications. Candidates will participate in system design, requirements development, modeling/simulation, data analysis, and field/operational testing for DoD and Intelligence Community (IC) programs. Work spans concept development through transition to operational capability. This role supports high-impact mission areas in space control, missile warning/defense, and remote sensing. Why Join Us Direct, meaningful contribution to high-priority national security missions. Opportunities to work on emerging EO/IR technologies across space and defense sectors. Culture of mentorship, technical development, and internal mobility. Ability to influence system architecture and deliver fielded capability.