POLARIS Raumflugzeuge GmbH is seeking an Avionics System Engineer to design and integrate detailed avionics architecture for two-stage winged hypersonic spaceplanes, covering data handling, bus systems, sensor integration, and electrical power subsystems. Key responsibilities include implementing control laws on embedded hardware and managing electrical/data interfaces. Candidates should possess a Master's degree in aerospace or electrical engineering, 3-4 years of aircraft avionics experience, strong knowledge of avionics standards, and be fluent in English with a proactive, team-oriented mindset.