CAD Designer (AI​/CAD Integration

Subcritical Systems is seeking a CAD Designer to join our mechanical engineering team and help bridge ATLAS, our AI-driven engineering platform, with conventional CAD design workflows. ATLAS is SSI's internal multi-agent AI platform that automates design, simulation, and documentation work across engineering; its CAD automation tools (VIBE CAD) generate first-pass geometry and drawing templates. Working directly under the Lead Mechanical Designer, this role refines those first-pass outputs into production-quality 3D models, assemblies, and detailed fabrication drawings in Siemens NX.

The role serves as a key interface between AI-generated CAD design and traditional engineering design practice: validating, refining, and standardizing ATLAS-generated outputs for use by the broader mechanical engineering team. You will also be the voice of the customer for ATLAS: we are building the platform to fit the normal CAD workflow designers are used to, and your feedback shapes how it develops.

The ideal candidate is eager to develop strong fundamentals in precision mechanical design (cryogenic, vacuum, and RF hardware) while working at the forefront of AI-assisted engineering: automated geometry generation, design iteration, drafting, and model validation.

This is a hands-on position for a designer who wants to deepen their Siemens NX expertise while helping define how AI-generated engineering designs move from ATLAS into validated, manufacturable CAD.

• Refine first-pass geometry, templates, and design outputs generated by ATLAS (VIBE CAD) into production-quality 3D models, assemblies, and detailed fabrication drawings in Siemens NX, making them reasonable, standards-compliant, and buildable.
• Validate, refine, and standardize ATLAS-generated outputs against design intent and internal drafting standards before release to the broader mechanical engineering team.
• Apply AI-assisted CAD tools and workflows (generative design exploration, AI-assisted drafting and checking, NX Open/Knowledge Fusion automation, and AI copilots for documentation) as a standard part of daily modeling and drafting work.
• Assist in building and maintaining CAD automation scripts and templates (NX Open, Python) that connect NX with ATLAS to reduce repetitive drafting tasks, with guidance from senior team members.
• Develop and maintain 3D CAD models and assemblies in Siemens NX for cryomodule components, sub-assemblies, and supporting tooling, under the direction of the Lead Mechanical Designer.
• Produce detailed, manufacturing-ready 2D drawings, including dimensioning, tolerancing (GD&T), and BOM generation, following ASME Y14.5 and internal drafting standards.
• Support design iteration for cryogenic, vacuum, and superconducting RF (SRF) hardware, and maintain accurate part and assembly data in the PLM/document control system with proper revision control and traceability.
• Participate in design reviews, redlines, and ECOs, and coordinate with mechanical, cryogenic, and RF engineers to turn design intent into accurate, buildable CAD deliverables, supporting interference checks and tolerance stack-up studies as needed.

• Bachelor's degree in mechanical engineering, mechanical design, engineering technology, or a related field.
• 2+ years of professional CAD design or drafting experience.
• Working proficiency in Siemens NX (modeling, assemblies, and drafting modules), with a basic understanding of GD&T and mechanical drawing conventions.
• Genuine interest in learning and applying AI-based design, drafting, and automation tools as part of daily CAD work.
• Strong attention to detail, organizational skills, and willingness to take direction and feedback from senior designers and engineers.
• Effective written and…