Senior Mechanical Design Engineer — FEA & CAD for Energy

Subcritical Systems Inc; Austin (TX); On-site; USD 110,000 - 160,000; Full time

Benefits offered by this job

Health insurance

Job summary

Subcritical Systems Inc. in Austin, TX is hiring a Mechanical Design Engineer with 10+ years of experience to join our on-site team.

You will develop designs for subcritical assembly and accelerator components, performing FEA and simulations, and creating 3D CAD models and drawings in NX/SolidWorks. Collaborate with scientists and engineers to translate requirements into manufacturable solutions, manage BOMs, and ensure safety and quality standards.

Qualifications

• 10+ years of experience in mechanical design engineering or a comparable role.
• Proficiency in Structural Finite Element Analysis (FEA).
• Bachelor's degree in Mechanical Engineering.
• Proficiency with NX, SolidWorks, Solid Edge, Pro‑E, or similar 3D CAD tools (NX preferred).
• Ability to create, revise, and check mechanical drawings using GD&T per ASME Y14.5.
• Familiarity with machining, metalworking, and welding.
• Experience applying design-for-manufacturing (DFM) and design-for-assembly (DFA) principles to support engineering intent.
• Ability to translate engineering requirements into detailed drawing packages.
• Experience working in a team environment with scientists, engineers and technicians.
• Strong work ethic, resilient, able to work in a fast-paced collaborative environment.

Responsibilities

• Develop conceptual and detailed mechanical designs for components, assemblies, and systems.
• Perform structural finite element analyses of mechanical systems
• Translate functional requirements, specifications, and performance targets into manufacturable designs.
• Create and manage 3D CAD models and 2D fabrication drawings using NX or SolidWorks (NX preferred).
• Conduct engineering calculations and simulations (stress, thermal, vibration, fatigue, CFD).
• Generate assembly models, weldment drawings, and detailed part documentation.
• Use analytical tools or finite-element packages to validate design integrity.
• Select materials, coatings, and surface treatments for performance and corrosion resistance.
• Develop fabrication and assembly specifications, BOMs and procurement packages.
• Prepare engineering documentation, including design reports and interface control documents.
• Manage fabrication tasks and fabrication procurements.
• Support build-out of in-house manufacturing and testing systems
• Ensure compliance with applicable codes, standards, and safety requirements.
• Apply GD&T, DFM, and DFA practices to ensure drawings are clear, manufacturable, and accurate
• Interface with suppliers, vendors, and fabrication shops to communicate drawing requirements and resolve build issues

Skills

Structural FEA

NX Mastery

SolidWorks

GD&T ASME Y14.5

DFM / DFA

3D CAD

Education

Bachelor's degree in Mechanical Engineering

Master's degree in Mechanical Engineering

Tools

NX

SolidWorks

Solid Edge

Pro-E

Job description

Subcritical Systems Inc. in Austin, TX is hiring a Mechanical Design Engineer with 10+ years of experience to join our on-site team.

You will develop designs for subcritical assembly and accelerator components, performing FEA and simulations, and creating 3D CAD models and drawings in NX/SolidWorks. Collaborate with scientists and engineers to translate requirements into manufacturable solutions, manage BOMs, and ensure safety and quality standards.