Mechanical Engineer Jobs at Mainspring Energy with Visa Sponsorship
Mechanical Engineer jobs at Mainspring Energy involve developing and manufacturing linear generator technology, with visa sponsorship available across multiple categories. If you're on a work visa or transitioning from OPT, Mainspring treats engineering roles as a core part of its sponsorship pipeline.
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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 Mid-Level Mechanical Engineers with a focus on designing hardware that requires thermal and fluids analysis. In this role, you will design hardware for air and liquid handling systems. The Engineer will develop new concepts and manage existing concepts through development, deployment, and manufacturing. Mainspring is a great place for engineers with a variety of areas of deep expertise, who like to solve challenging cross-functional problems with a mix of computational analysis, hands-on engineering and team effort.
Responsibilities
- Participate in brainstorming activities to develop novel ways to improve all aspects of the Linear Generator
- Develop and optimize key thermal subsystems of the Linear Generator to drive down cost, improve performance, and deliver high reliability
- Contribute to projects within the thermal subsystems and projects in other subsystems
- Work with reliability and test teams to validate systems and components with fast cycles of learning for deployment into the next generation of Linear Generators
- Collaborate cross-functionally with manufacturing engineering, NPI, and external suppliers to rapidly deploy new designs into production
Qualifications
- BS Degree in Mechanical Engineering or a similar engineering field from an accredited institution + 3 years of relevant industry experience or MS + 2 years of relevant industry experience
- Direct experience designing air or liquid handling systems, with demonstrated engineering fundamentals in thermo-fluid system design
- Fluent in SolidWorks or comparable CAD package. Experience with using PLM (Product Lifecycle Management) or a similar CAD version control system is preferred
- Experience with finite element analysis (structural, thermal, or fluids)
- Familiarity with thermal systems design simulation tools
- Experience developing test plans, and analyzing data, for benchtop to product scale tests to validate new design concepts
- Experience working with suppliers to develop and qualify new components
- Experience with various manufacturing processes such as sheet metal forming, machining, and plastics molding and forming
- Demonstrated attention to detail with the ability to generate and review design documentation, bill of materials, work instructions and test plans and reports
- Experience utilizing GD&T is ideal
- Self-starter with a proven ability to deliver functional product designs in a rapid development environment
- Experience with a full design lifecycle from concept through manufacturing support is preferred
- Interest in developing creative and cost effective solutions to enable the deployment of zero carbon energy technology at large scale
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.
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
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 Mid-Level Mechanical Engineers with a focus on designing hardware that requires thermal and fluids analysis. In this role, you will design hardware for air and liquid handling systems. The Engineer will develop new concepts and manage existing concepts through development, deployment, and manufacturing. Mainspring is a great place for engineers with a variety of areas of deep expertise, who like to solve challenging cross-functional problems with a mix of computational analysis, hands-on engineering and team effort.
Responsibilities
- Participate in brainstorming activities to develop novel ways to improve all aspects of the Linear Generator
- Develop and optimize key thermal subsystems of the Linear Generator to drive down cost, improve performance, and deliver high reliability
- Contribute to projects within the thermal subsystems and projects in other subsystems
- Work with reliability and test teams to validate systems and components with fast cycles of learning for deployment into the next generation of Linear Generators
- Collaborate cross-functionally with manufacturing engineering, NPI, and external suppliers to rapidly deploy new designs into production
Qualifications
- BS Degree in Mechanical Engineering or a similar engineering field from an accredited institution + 3 years of relevant industry experience or MS + 2 years of relevant industry experience
- Direct experience designing air or liquid handling systems, with demonstrated engineering fundamentals in thermo-fluid system design
- Fluent in SolidWorks or comparable CAD package. Experience with using PLM (Product Lifecycle Management) or a similar CAD version control system is preferred
- Experience with finite element analysis (structural, thermal, or fluids)
- Familiarity with thermal systems design simulation tools
- Experience developing test plans, and analyzing data, for benchtop to product scale tests to validate new design concepts
- Experience working with suppliers to develop and qualify new components
- Experience with various manufacturing processes such as sheet metal forming, machining, and plastics molding and forming
- Demonstrated attention to detail with the ability to generate and review design documentation, bill of materials, work instructions and test plans and reports
- Experience utilizing GD&T is ideal
- Self-starter with a proven ability to deliver functional product designs in a rapid development environment
- Experience with a full design lifecycle from concept through manufacturing support is preferred
- Interest in developing creative and cost effective solutions to enable the deployment of zero carbon energy technology at large scale
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.
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
Tips for Finding Mechanical Engineer Jobs at Mainspring Energy
Tailor your resume to linear generator work
Mainspring builds combustion-based linear generators, so frame your mechanical experience around thermodynamics, combustion systems, or precision manufacturing. Generic mechanical resumes get filtered out early. Highlight tolerances, materials selection, or production-scale hardware development.
Confirm your visa category fits the role
Mainspring sponsors H-1B, E-3, TN, and F-1 OPT for Mechanical Engineers, but not every category fits every situation. Verify your degree field aligns with the specialty occupation definition USCIS requires before you apply.
Time OPT applications around Mainspring's hiring cycles
If you're on F-1 OPT, start your application at least three months before your authorization expires. Mainspring's manufacturing roles often require onboarding ramp time, and USCIS STEM OPT extension processing adds another variable to your timeline.
Use Migrate Mate to find open Mechanical Engineer roles
Mainspring posts Mechanical Engineer openings across different engineering specializations. Use Migrate Mate to filter specifically for Mainspring roles that match your visa type so you're targeting positions the company is actively sponsoring.
Ask about LCA filing during the offer stage
Before signing an offer, confirm your employer will file the Labor Condition Application with DOL promptly. LCA certification is a prerequisite for H-1B and E-3 petitions, and delays at this stage can push your start date beyond your authorized period.
Prepare PERM-relevant documentation early for Green Card pathways
If you're targeting long-term sponsorship, organize transcripts, foreign credential evaluations, and employment verification records now. PERM filings require DOL to audit your qualifications against the job description, and gaps in documentation create costly delays.
Frequently Asked Questions
Does Mainspring Energy sponsor H-1B visas for Mechanical Engineers?
Yes, Mainspring Energy sponsors H-1B visas for Mechanical Engineer roles. The company has a consistent track record of filing H-1B petitions for engineering positions, which reflects how central technical talent is to its manufacturing operations. You'll want to confirm the specific role qualifies as a specialty occupation under USCIS criteria, which generally requires a bachelor's degree or higher in a directly related engineering field.
How do I apply for Mechanical Engineer jobs at Mainspring Energy?
Applications go through Mainspring Energy's careers page, where roles are listed by engineering function. Migrate Mate also aggregates Mainspring's open Mechanical Engineer positions and filters them by visa type, which makes it easier to identify which roles align with your sponsorship situation before you apply. Tailor your application to Mainspring's core focus on linear generator hardware and manufacturing scale-up.
Which visa types does Mainspring Energy commonly use for Mechanical Engineers?
Mainspring Energy sponsors H-1B, E-3 visa, TN visa, F-1 OPT, and EB-2 or EB-3 Green Card pathways for Mechanical Engineers. H-1B and E-3 visa are the most common nonimmigrant routes for engineering hires. Australian nationals can pursue the E-3 without entering the H-1B lottery. Canadian and Mexican nationals in qualifying engineering roles may qualify under TN visa. Green Card sponsorship typically follows after an initial nonimmigrant visa period.
What qualifications does Mainspring Energy expect for Mechanical Engineer roles?
Most Mechanical Engineer postings at Mainspring require a bachelor's degree in mechanical engineering or a closely related field. Roles focused on hardware development and manufacturing often favor candidates with hands-on experience in combustion systems, electromechanical assemblies, or precision machining. For USCIS specialty occupation purposes, your degree field needs to directly correspond to the duties of the specific role you're applying for.
How do I think about the timeline for visa sponsorship at Mainspring Energy?
The timeline depends heavily on your visa category. H-1B petitions are cap-subject and filed once per year, with an October 1 start date, so planning 9 to 12 months ahead matters. E-3 and TN visas can be processed at a consulate with significantly shorter timelines. If you're on OPT, confirm your authorization period gives you enough runway for USCIS to process a change of status petition before your current work authorization expires.