Spacecraft Software Engineer (Mid-Career) - Millennium Space Systems Company: Millennium Space Systems Spacecraft Software Engineer (Mid-Career) - Millennium Space Systems Millennium Space Systems (MSS), a part of Boeing Defense, Space and Security (BDS) is seeking a Spacecraft Software Engineer (Mid-Career) to support the Engineering team in El Segundo, CA! Job Summary As a Spacecraft Software Engineer at Millennium Space Systems, you'll create the software that makes our satellites function