The System Engineering & Integration Team (SE&IT) is seeking a Responsible Systems Engineer (RSE) to join the System Concepts and Requirements (SC&R) team in Huntsville, AL. The successful candidate will lead cross-functional teams to develop system level architecture and requirements to influence Missile Defense Agency (MDA) incremental capability. The candidate will use Model Based Systems Engineering (MBSE) to evaluate architectural impacts through functional and behavior analysis for the defeat of conventional and advanced Threats (i.e., ballistic, aero-maneuvering, hypersonic, hyper-glide, countermeasures, etc.) systems within the (MDA) mission areas. The RSE will collaborate in an MBSE environment to develop system-of-systems requirements via system/component trade studies and analysis, and lead the development of Change Notices (CNs) to MDA’s system specification to include functional, interface and performance requirements, architectural models, interface definitions, and support Trace verifcation from System to Element level requirements. The RSE will develop and deliver products (i.e., technical briefings, CNs) to support internal and MDA stakeholder reviews.