The Senior Mechanical Systems Design Engineer is responsible for delivering various engineering outputs, including the design of aircraft potable water and waste mechanical systems, equipment selection, 3D modeling, overseeing development testing, substantiation documents, test plans, and test reports. The role involves performing complex assignments that may require the development of new or improved products, processes, or techniques. The engineer will evaluate the feasibility and effectiveness of proposed engineering tests, products, and equipment, and contribute to successful project completion by resolving issues such as conflicting design requirements and difficult coordination requirements. The position also requires coordination and support of project activities with other operating or engineering units to ensure participation of appropriate staff in project completion. The engineer will assist in determining project objectives, review and approve design data, generate artifacts, reports, and design reviews, and participate in professional organizations to maintain current knowledge of technical innovations.