Perform model-based systems engineering (MBSE) functional and behavior analysis for the defeat of conventional and advanced Threats (e.g., ballistic, aero-maneuvering, hypersonic, hyper-glide, countermeasures, etc.) systems within the Missile Defense Agency's (MDA) mission area. Participate in a MBSE environment to develop system-of-systems requirements via system/component trade studies and analysis. Contributes to publishing change notices to MDA's system specification and update of requirements databases, architectural models, interface definitions, and DoDAF 2+ compliant based design packages to document, allocate and trace system and Element level requirements. Document analysis results in reports and briefings for critique and review by SC&R and National Team stakeholders. Create and present briefings within the team and to Missile Defense Agency (MDA) and supporting stakeholders. Duties will include leading small teams of engineers in the development of products. The position is in Huntsville, AL and is located on a customer site at the Boeing Jetplex facility. Bachelor's Degree in a STEM (Science, Technology, Engineering or Mathematics) discipline from an accredited university and 12 years of related experience, or a Master's Degree and 10 years of related experience, or 8 years of related experience with a PhD. Strong prior experience with use of MSOSA (Cameo) and DOORS. Must demonstrate a strong technical background in architecture development, functional decomposition, requirements development and allocation, and interface definition with system-modelling tools. Must be able to demonstrate knowledge of MBSE and the use of SysML to describe behaviors of a complex DoD system. Must demonstrate the ability to think critically and capture concepts in papers, presentations, and discussions. Must possess good communication skills. Capable of working both independently and within a small team environment. The successful candidate must also be willing to assume a technical leadership role at times. Ability and willingness to work on a customer site. Ability and willingness to travel up to 10% of the time. Applicants must have a current active in-scope U.S. Government DoD issued Secret security clearance at the time of application which is required to start. Demonstrated experience modeling or simulating missile defense applications or similar domains (air combat, air defense, intercept of ballistic targets, intercept of non-ballistic targets, space vehicles, sub-orbital mechanics, etc.). Knowledge of ballistic and advanced threat systems (e.g., aero-maneuvering, hypersonic, hyper-glide, countermeasures, etc.). Modeling and analysis experience in aspects of the missile defense system (e.g., Aegis Weapons Systems, Ground-based Midcourse Defense (GMD), Glide Phase Intercept (GPI), Hypersonic and Ballistic Tracking Space Sensor (HBTSS), Fire Control, C2BMC, MDS sensors (EO/IR/RF), kill vehicles, interceptors, countermeasures, etc.). Systems engineering experience with large, complex systems.