Mechanical Engineer III - Design

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Mechanical Engineer III - Design based in the United States. The Mechanical Engineer III will contribute to the design and development of advanced mechanical systems supporting demanding aerospace, defense, and space applications. This role combines hands-on engineering design with sophisticated analysis, modeling, materials evaluation, and manufacturing collaboration to solve complex technical challenges. You will work across areas such as actuators, pressure vessels, thermal protection, propulsion components, and solid rocket motor systems, helping transform engineering concepts into reliable, manufacturable solutions. The position requires strong technical judgment, the ability to evaluate design alternatives, and effective collaboration with multidisciplinary teams. With opportunities to support mission-critical programs and contribute to innovative engineering technologies, this role is suited to an experienced engineer who thrives in technically challenging environments. Accountabilities: - Develop and refine mechanical designs using fundamental engineering principles, including actuator concepts, pressure vessels, hot gas valves, thrusters, igniters, and solid rocket motor components. - Perform design trade studies, evaluate alternative solutions, and provide engineering recommendations based on performance, reliability, manufacturability, and program requirements. - Create detailed 2D drawings, 3D models, complex assemblies, and technical documentation using CAD tools, applying geometric dimensioning and tolerancing (GD&T) principles. - Conduct structural, stress, dynamic, thermal, tolerance, and computational fluid dynamics (CFD) analyses to assess and optimize design performance. - Interpret simulation and analysis results, validate engineering assumptions, identify design improvements, and support informed technical decisions.

- Evaluate materials for demanding operating environments, including ceramics, rubber and phenolic thermal insulators, advanced metals, and refractory materials. - Contribute to material characterization, insulator system development, and research into specialized alloys and advanced material technologies. - Support manufacturing planning and execution, including additive manufacturing, carbon composite processes, machining, molding, casting, welding, and mechanical assembly. - Collaborate with manufacturing and cross-functional engineering teams to ensure designs meet technical specifications and can be produced effectively. - Prepare technical reports, presentations, user manuals, and other engineering documentation for different technical and non-technical audiences. - Apply knowledge of propellant chemistry, combustion mechanisms, grain configurations, and solid propellant formulation and manufacturing processes where relevant to propulsion design activities. - Support systems engineering activities, including mass calculations, mass budget management, and mass reduction initiatives. - Contribute to program planning, acquisition lifecycle coordination, requirements analysis, reliability engineering, safety assessments, and risk management. - Coordinate engineering activities and communicate technical findings, challenges, and recommendations to project stakeholders. Requirements: - 4–7 years of professional mechanical engineering experience. - Bachelor of Science degree in Mechanical Engineering, Aerospace Engineering, or another relevant engineering discipline from an accredited university; equivalent experience may be considered in lieu of a degree. - Strong foundation in mechanical design, engineering analysis, CAD modeling, technical drawing development, and GD&T.