Senior Product Integration Engineer (CAD)

Mainspring Energy, Inc.; Menlo Park (CA); On-site; USD 130,000 - 153,000; Full time

Job summary

Mainspring Energy, Inc. in Menlo Park, CA seeks a Senior Product Integration Engineer (CAD) to own the integrated CAD definition as designs evolve. You will unify subsystem CAD into authoritative CATIA assemblies and ensure cohesive product integration across engineering teams.

Strong 3D CAD experience, packaging/interface problem solving, and cross-team collaboration are essential for this hands-on role.

Qualifications

• BS in Mechanical Engineering, Product Design, or a related technical field, or equivalent relevant experience
• 5+ years of experience in mechanical CAD, product design, packaging, product integration, or complex equipment design
• Advanced proficiency with CATIA, NX, Creo, SolidWorks, or another advanced 3D CAD platform; strong CATIA experience is highly preferred
• Demonstrated experience building and maintaining large, complex, multi-subsystem assemblies with disciplined reference and configuration practices
• Strong mechanical intuition and ability to identify packaging, clearance, routing, serviceability, assembly, and interface issues from 3D CAD
• Strong understanding of mechanical interfaces, drawings, GD&T, BOMs, revisions, and engineering change workflows
• Ability to communicate spatial and interface problems clearly and collaborate with engineers from multiple subsystem teams
• Detail-oriented, organized, and comfortable coordinating multiple design changes that affect interfacing hardware

Responsibilities

• Build, maintain, and continuously improve authoritative POR and future-state reference assemblies for the Linear Generator
• Integrate subsystem CAD from multiple Design Engineering teams into full-product CATIA assemblies and keep those assemblies current as engineering changes progress
• Maintain clean full-product CAD structure, references, interfaces, metadata, and configuration logic across major assemblies
• Perform packaging studies, interference checks, clearance reviews, routing studies, service-access checks, and assembly-access evaluations
• Identify conflicting space claims and work with Design Engineers to negotiate interfaces and converge on practical whole-product solutions
• Create and maintain reference geometry, interface geometry, envelopes, simplified models, and other integration artifacts needed to support cross-team design work
• Support design reviews with clear visualizations of clashes, interfaces, access constraints, and product-level integration risks
• Identify and resolve inconsistencies among integrated CAD, drawings, EBOM structure, and the intended product configuration before release
• Support Product Release and Configuration Management by providing a clear, traceable digital definition of the product state being released
• Help establish scalable methods and standards for CATIA, large-assembly performance, imported geometry, simplification, reference assemblies, and cross-CAD workflows

Skills

Mechanical CAD

Product design

Packaging

Product integration

Complex equipment design

Mechanical intuition

GD&T understanding

Education

BS in Mechanical Engineering

BS in Product Design

Equivalent experience

Tools

CATIA

NX

Creo

SolidWorks

3D CAD platforms

Job description

About Mainspring

Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more.

The core values that ground our work, guide our decisions, and connect us together:

• Pragmatic Optimism
• Excellence without Ego
• Proactive Collaboration

Job Overview

Mainspring is seeking a Senior Product Integration Engineer (CAD) to own and maintain the integrated CAD definition of the Linear Generator as designs evolve. Design Engineers will continue to own the technical design and subsystem CAD; this role will make sure those designs are incorporated into authoritative POR and future-state reference assemblies and work together correctly in the context of the complete product.

This role combines product-definition ownership with hands‑on whole‑product CAD integration. The ideal candidate is exceptionally strong in 3D CAD, understands how complex mechanical systems fit together, and enjoys resolving packaging, interface, and configuration problems across multiple engineering teams. This role will be a key user of CATIA for full-product assemblies that exceed the practical limits of SolidWorks.

Core Responsibilities

• Build, maintain, and continuously improve authoritative POR and future-state reference assemblies for the Linear Generator
• Integrate subsystem CAD from multiple Design Engineering teams into full-product CATIA assemblies and keep those assemblies current as engineering changes progress
• Maintain clean full-product CAD structure, references, interfaces, metadata, and configuration logic across major assemblies
• Perform packaging studies, interference checks, clearance reviews, routing studies, service-access checks, and assembly-access evaluations
• Identify conflicting space claims and work with Design Engineers to negotiate interfaces and converge on practical whole-product solutions
• Create and maintain reference geometry, interface geometry, envelopes, simplified models, and other integration artifacts needed to support cross-team design work
• Support design reviews with clear visualizations of clashes, interfaces, access constraints, and product-level integration risks
• Identify and resolve inconsistencies among integrated CAD, drawings, EBOM structure, and the intended product configuration before release
• Support Product Release and Configuration Management by providing a clear, traceable digital definition of the product state being released
• Help establish scalable methods and standards for CATIA, large-assembly performance, imported geometry, simplification, reference assemblies, and cross-CAD workflows

Qualifications

• BS in Mechanical Engineering, Product Design, or a related technical field, or equivalent relevant experience
• 5+ years of experience in mechanical CAD, product design, packaging, product integration, or complex equipment design
• Advanced proficiency with CATIA, NX, Creo, SolidWorks, or another advanced 3D CAD platform; strong CATIA experience is highly preferred
• Demonstrated experience building and maintaining large, complex, multi-subsystem assemblies with disciplined reference and configuration practices
• Strong mechanical intuition and ability to identify packaging, clearance, routing, serviceability, assembly, and interface issues from 3D CAD
• Strong understanding of mechanical interfaces, drawings, GD&T, BOMs, revisions, and engineering change workflows
• Ability to communicate spatial and interface problems clearly and collaborate with engineers from multiple subsystem teams
• Detail-oriented, organized, and comfortable coordinating multiple design changes that affect interfacing hardware

Preferred Qualifications

• Experience integrating products containing structures, piping/tubing, electrical hardware, thermal systems, enclosures, and serviceable components
• Experience with SolidWorks-to-CATIA or other multi-CAD integration workflows
• Experience with ENOVIA, 3DEXPERIENCE, or another PLM/PDM system
• Experience in complex industrial equipment, aerospace, automotive, robotics, energy systems, or another highly integrated hardware product

$130,000 - $153,000 a year

This position is onsite at our Menlo Park HQ. The salary will be adjusted to reflect local market conditions based on employee location as well as the experience of the employee. Along with the base salary, Mainspring offers pre-IPO stock options + benefits.

Does your experience not meet all of our posted requirements? Studies have shown that some people are less likely to apply to positions unless they meet every listed requirement. At Mainspring, we are committed to building a diverse, inclusive, flexible, and collaborative environment, so if you want to help us transition the world to clean and affordable electricity, and don’t meet all posted requirements for a particular role, we’d still love to hear from you. Mainspring can sometimes be flexible enough to shift responsibilities for the right person, or otherwise identify open or upcoming roles that may better fit your professional background.

In more traditional words, Mainspring Energy, Inc is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.

This compensation and benefits information is based on Mainspring Energy's estimate as of the date of publication and may be modified in the future. We generally do not negotiate on salary once we have made an offer. The level of pay within the range will depend on a variety of job-related factors that may include location, relevant prior experience and/or education, or particular skills and expertise. New hires joining the company tend to be paid within the starting base pay range noted above, with opportunities to increase pay over time based on development of additional skills, competencies, and company-specific knowledge.