Mechanical Design Engineer, Senior

Mechanical Design Engineer, Senior Overview

Sim Tech, Inc., recognized as one of the 2026 Best Places for Working Parents
, is seeking a Mechanical Design Engineer, Senior
, to join our dynamic and diverse team in Huntsville, AL.

Sim Tech offers a market leading compensation package with excellent benefits, work/life balance, outstanding retirement plan, career advancement and much more.

The Mechanical Design Engineer, Senior will lead the design, analysis, development, and production release of complex mechanical components and assemblies.

• Develop 3D parametric models, detailed part drawings, and assembly drawings in Solid Works from concept through production release.
• Produce engineering drawings with complete GD&T per ASME Y14.5, including dimensions, tolerances, datum schemes, and surface finish callouts suitable for fabrication and inspection.
• Perform tolerance stack-up analyses (worst-case and statistical) to verify fit, function, and assembly feasibility prior to release.
• Conduct structural, modal, and thermal finite element analyses (FEA) to validate mechanical designs against load, vibration, shock, and thermal-environment requirements.
• Select materials, fasteners, and commercial-off-the-shelf components based on mechanical, environmental, manufacturing, and cost requirements.
• Apply Design for Manufacturability (DFM) and Design for Assembly (DFA) principles in collaboration with manufacturing and supplier-quality teams to reduce cost and assembly risk.
• Lead prototype build, design verification testing, and iterative refinement of mechanical designs to validate performance prior to production.
• Prepare and present designs at preliminary and critical design reviews (PDR, CDR), incorporating peer and stakeholder feedback into the released baseline.
• Author engineering change proposals and engineering change notices (ECP/ECN) and maintain mechanical design baselines under formal configuration management.
• Collaborate with electrical, systems, and software engineering, as well as manufacturing and test, to ensure mechanical interfaces meet program requirements.
• Provide technical leadership on mechanical design efforts, establish design standards and best practices, and mentor less experienced engineers.
• Other duties as assigned.

• Bachelor's degree in Mechanical Engineering, Aerospace Engineering, or a closely related discipline from an accredited institution.
• 10+ years of demonstrated mechanical design experience, preferably in defense, aerospace, or comparable regulated industry.
• Proficiency in Solid Works, including assembly modeling and detailed drawing creation.
• Strong working knowledge of GD&T per ASME Y14.5 and the ability to apply tolerance schemes that meet inspect ability and producibility requirements.
• Experience performing FEA using Solid Works Simulation and interpreting results to drive design decisions.
• Experience performing tolerance stack-up analyses to validate mechanical fit and function.
• Working familiarity with common manufacturing processes (machining, sheet metal, casting, additive manufacturing) and their design implications.
• Demonstrated experience leading mechanical design efforts and mentoring less experienced engineers.
• Strong written and verbal communication skills, with the ability to interact effectively with all stakeholders.
• A self-starter, team player with a desire to work with a team of engineers, integrators, analysts, and others in a dynamic and fast-paced environment.
• U.S. Citizenship with Active Secret Security clearance and ability to maintain required clearance.

Employees in these positions will function in a general office/cubicle setting environment, and laboratory/testing setting using standard office equipment and various electronic testing equipment, including a computer, telephone, printers, video equipment, computer software and testing equipment. Will interact in a general office setting environment with various personnel; participate in meetings and contribute to team success; deliver timely results and produce reports;

receive and communicate information; may…