Mainspring Energy
Mechanical Engineer
Menlo Park, CA
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odds of building a lasting career here
Sponsors, but it's cap-subject — you still face the weighted lottery (~45% per draw at Level III). Good if you win; have a cap-exempt backup on your list.
Lottery odds assume a STEM candidate.
Personalize to your clock →H-1B wage level
the lottery is wage-weighted — each level is one more entry
$15,493 more — $134,493 — moves this role to Level II and 2 lottery entries. That figure is inside the range the employer already advertised.
Based on the DOL prevailing wage for this occupation and worksite, a base salary of $134,493 would place this position at wage Level II. That figure is within the posted range, and I'd like to target it. This role classifies under "Mechanical Engineers" for prevailing-wage purposes.
DOL prevailing wage, 2026-27 wage year · Mechanical Engineers (17-2141) · San Francisco-Oakland-Fremont, CA. Wage level is derived by USCIS from the offered wage, occupation and worksite; the occupation shown is inferred from the job title.
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Sourced from Department of Labor LCA, PERM and prevailing-wage disclosure data. Employer matching is by name, so figures may be split across an employer's legal entities. Absence of a filing means none appears in our copy of the data, not that none exists.
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About the role
- Mainspring is seeking a Mechanical Engineer to own defined-scope mechanical engineering tasks, workstreams, or moderate-complexity projects for our Linear Generator platform.
- In this role, you will design mechanical hardware, support analysis and testing, drive assigned work through validation and release, and work cross-functionally with engineering, manufacturing, quality, supply chain, test, and service teams.
- This role is intended for engineers who have developed practical mechanical engineering experience through multiple design, analysis, test, release, or implementation cycles.
Responsibilities
- Own defined-scope mechanical engineering tasks, workstreams, or moderate-complexity projects with clear objectives and some ambiguity in execution.
- Design moderately complex parts, assemblies, fixtures, or subsystems while considering function, interfaces, manufacturability, serviceability, cost, reliability, and safety.
- Use engineering calculations, tolerance reviews, simulations, experiments, test data, and hands-on troubleshooting to validate designs and guide improvements.
- Develop and execute test plans, interpret results, document findings, and use evidence to support design, validation, and release decisions.
- Track deliverables, manage dependencies within your scope, communicate blockers early, and follow through on design, documentation, validation, and release activities.
Requirements
- Strong mechanical fundamentals, including practical experience with parts, assemblies, fixtures, mechanisms, structures, thermal systems, fluid systems, electromechanical packaging, or other relevant mechanical systems.
- BS or MS in Mechanical Engineering or a similar engineering field, with demonstrated experience contributing to mechanical design work beyond purely academic projects.
- Experience designing, analyzing, testing, and iterating mechanical hardware through multiple project phases or design cycles.
- Ability to independently own defined-scope engineering work with clear deliverables, while seeking guidance for ambiguous, complex, or high-risk decisions.
- Demonstrated ability to use analysis, testing, data, and engineering judgment to evaluate designs, compare options, and recommend practical next steps.
- Clear communication and execution skills, including the ability to document assumptions, decisions, risks, test results, and project status for technical and cross-functional stakeholders.
Nice to have
- Experience supporting hardware from concept through prototype, validation, release, production, or field use.
- Experience with CAD tools such as SolidWorks or similar, including part design, assembly design, drawings, and design documentation.
- Experience with PLM systems, drawing release, engineering change processes, supplier qualification, production support, or field implementation.
- Experience with structured problem-solving, root cause analysis, failure analysis, design of experiments, reliability testing, or risk-based validation planning.
- Experience working with suppliers, contract manufacturers, production teams, quality teams, or field service organizations.
- Experience with energy systems, engines, generators, compressors, pumps, thermal systems, fluid systems, structures, high-cycle fatigue environments, precision alignment systems, or industrial equipment.
- To help us evaluate your experience accurately, please ensure your resume includes:
- What you personally did, separate from what your team did.
Compensation
- 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.
This listing is sourced directly from Mainspring Energy's careers page and normalized into a canonical job model.