Senior Mechanical Engineer - Electromechanical

Ring Inc; Menlo Park (CA); On-site; USD 140,000 - 165,000; Full time

Benefits offered by this job

Stock options

Benefits

Job summary

Mainspring Energy in Menlo Park is seeking a Senior Mechanical Design Engineer focused on electrical enclosures and cables to drive performance and reliability. You will lead projects from requirements through testing and release, guiding cross‑functional reviews and ensuring subsystems meet aggressive technical targets.

The role requires hands‑on sheet metal design, thermal modeling, and SolidWorks CAD with data management; CFD/FEA knowledge is a plus.

Qualifications

• BS or MS in Mechanical Engineering from an accredited program; senior level scaled by experience.
• Experience owning electrical enclosure and/or cable design from concept to launch.
• Strong sheet metal design skills for medium-volume production and DFx.
• Solid understanding of thermal modeling and integration into system designs.
• Experience with CAD tools like SolidWorks, PDM, CFD/FEA is a plus.

Responsibilities

• Lead electrical enclosure and cable design projects from requirements through release.
• Collaborate with reliability, testing, and manufacturing to ensure performance and manufacturability.
• Balance cost, safety, and system reliability while driving iterations.
• Coordinate cross-functional reviews and supplier engagement for production deployment.
• Develop hardware requirements, prototyping, testing, and tooling to meet milestones.

Skills

Electrical enclosure design

Sheet metal design

Thermal modeling

Design for manufacturability

Cross-functional collaboration

Education

BS in Mechanical Engineering

MS in Mechanical Engineering

Tools

SolidWorks

PDM

CFD

Ansys

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 Senior Mechanical Design Engineers with a focus on designing electrical enclosures and cables while improving functionality and system‑level performance. In this role, you will lead projects from setting requirements, designing, conducting cross functional reviews, coordinating testing and release to ensure that key electrical subsystems meet challenging technical requirements with a potential for direct reports. Ideal candidates will have a strong combination of technical expertise and the drive to solve complex problems in a collaborative environment.

Core Responsibilities

• Involved in brainstorming and technical review sessions to develop innovative solutions that enhance the performance and cost‑efficiency of the Linear Generator and electrical subsystems
• Ownership of design, optimization, and execution of electrical hardware, balancing cost reduction, safety improvements, and system‑level reliability
• Collaborate with reliability and test teams to validate systems and components, ensuring fast iteration cycles and incorporating feedback to drive the next‑generation deployment of the Linear Generator
• Collaborate cross‑functionally with electrical engineering, manufacturing engineering, NPI, and external suppliers to deploy new designs into production, ensuring all systems meet the necessary performance and manufacturability requirements
• Development of electrical hardware, including requirements development, prototyping, testing, iteration, and tooling, ensuring project milestones are met and resources are allocated effectively

Qualifications

• Degree: BS or MS in Mechanical Engineering or a similar engineering field from an accredited institution. Experience and degree will determine the level, with the following minimum requirements: Senior: BS + 8 years or MS + 6 years
• Proven experience taking ownership of electrical enclosure and/or cable design, from initial design to launch
• Strong expertise in sheet metal design for medium‑volume production, electrical component specification, mechanical design for electrical systems, and design‑for‑manufacturability challenges
• A solid understanding of electrical engineering principles and thermal modeling, and the ability to integrate them effectively into larger system designs
• Extensive experience in SolidWorks and PDM (or a similar CAD version control system). Experience with CFD, FEA, and programs like SolidWorks Flow Simulation or Ansys is a plus
• Demonstrated ability to manage complex technical decisions, influence the direction of designs, and coordinate with teams to achieve successful outcomes
• Passion for creating innovative and cost‑effective solutions to enable the large‑scale deployment of zero‑carbon energy technologies

$140,250 - $165,000 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.

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.