Space systems engineers coordinate the design, analysis, and integration of spacecraft subsystems such as power systems, avionics, propulsion, GN&C, thermal control, and communications. They ensure mission requirements, reliability, space-environment compatibility, and system-level performance. Their work spans satellite missions, deep-space probes, space telescopes, and human spaceflight systems. They work with multi-disciplinary teams to validate design through simulations, environmental tests, and mission readiness evaluations. Growing space commercialization and exploration initiatives have made this a high-demand aerospace role.