Mainspring Energy
Senior Mechanical Engineer
Menlo Park, CA · Senior
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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
$18,454 more — $158,454 — moves this role to Level III and 3 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 $158,454 would place this position at wage Level III. 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 Senior Mechanical Engineer to own significant mechanical engineering projects, subsystems, or technical workstreams for our Linear Generator platform.
- In this role, you will develop robust mechanical designs, drive projects through the full design cycle, and work cross-functionally to validate and release hardware into production or field use.
- This role is intended for engineers who have already demonstrated independent ownership of meaningful mechanical design work through multiple design, test, release, or implementation cycles.
Responsibilities
- Own significant mechanical projects, subsystems, or technical workstreams from requirements and concept development through validation, release, and implementation.
- Develop and release robust mechanical designs for complex parts, assemblies, fixtures, subsystems, or processes, balancing performance, reliability, cost, manufacturability, serviceability, safety, schedule, and system integration.
- Build and drive project plans, requirements, validation strategies, schedules, risk assessments, and release plans within an agreed scope.
- Use engineering analysis, test planning, experimental data, tolerance reviews, simulations, and hands-on troubleshooting to make design decisions and validate performance.
- Lead cross-functional technical discussions, design reviews, risk reviews, and project decisions with engineering, manufacturing, quality, reliability, test, supply chain, suppliers, and service stakeholders.
Requirements
- BS or MS in Mechanical Engineering or a similar engineering field, with demonstrated experience owning mechanical design work beyond task-level execution.
- Repeated experience designing, testing, iterating, and releasing mechanical hardware across multiple design cycles, not only supporting isolated tasks or one phase of development.
- Ability to independently own a significant subsystem, project, or technical workstream with moderate ambiguity, cross-functional dependencies, and meaningful program impact.
- Strong mechanical design fundamentals, including practical experience with complex parts, assemblies, fixtures, mechanisms, structures, thermal systems, fluid systems, electromechanical packaging, or other relevant mechanical systems.
- Demonstrated ability to use analysis, testing, data, and engineering judgment to make design tradeoffs, validate performance, and resolve technical problems.
- Strong communication and project execution skills, including the ability to define scope, manage dependencies, escalate risks with recommendations, and align technical and non-technical stakeholders.
Nice to have
- Experience with PLM systems, drawing release, engineering change processes, supplier qualification, production ramp, or field implementation.
- Experience with reliability testing, accelerated life testing, failure analysis, design of experiments, structured root cause analysis, or risk-based validation planning.
- Experience working directly with suppliers, contract manufacturers, production teams, quality teams, or field service organizations to resolve hardware issues.
- To help us evaluate your experience accurately, please ensure your resume includes:
- What you personally did, separate from what your team did.
- If you contributed to a group project, tell us your specific role and contribution.
- The engineering fundamentals you applied - tie your skills (CAD, FEA, GD&T, thermal/fluid analysis, testing, etc.) to the actual problem you used them on, rather than listing them as standalone skills.
- What happened as a result - did it pass validation/testing, resolve a failure, ship to production, and if so, at what volume or scale (prototype quantity, low-rate production, high-volume manufacturing)?
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.