Communications Systems Engineer (5G Satellites) to design, integrate, and test next-generation 5G satellites and advanced communications systems. Youll collaborate across internal and external engineering teams to build clear, data-driven trade studies and recommendations spanning ground infrastructure, payload solutions, and key technology trade-offs. Responsibilities: Generate system-level requirements, specifications, and interface definitions Perform end-to-end system design trade-offs Analyse system-level performance and allocate requirements to subsystems/components Define system and satellite payload CONOPS and architecture, with emphasis on RF and PHY layer aspects Develop requirements for antenna systems and on-board processing functions Drive technology maturation and risk-reduction plans for critical elements (ground and space) Support business development and proposal activities with multiple customers and partners Lead/participate in specification trade-off negotiations with customers, partners, engineers, and working groups Experience: Educated to PhD or similar in Electrical Engineering, Mathematics, Physics, or related discipline Strong communication, analytical and mathematical skills Simulation and computer modelling (e.g., MATLAB, Python, C/C++, or similar) Digital signal processing background RF & comms systems engineering experience (link budgets, RF line-ups, waveform design) Experience in the space industry (LEO/MEO/GEO, payload/ground segments) Understanding of 5G or related technologies (e.g., LTE/NR) Familiarity with phased array antennas ? Hybrid working with occasional travel to partner/customer sites and test facilities (as required) Bluestream Recruitment is an Equal Opportunities Employer and operates as an Employment Agency for permanent recruitment and an as an Employment Business for temporary / contract recruitment.