Mainspring Energy

Mainspring Energy

Principal Mechanical Engineer

Menlo Park, CA · Principal

Sponsorship not specified$210k-$247kDetected 76 days ago
Product StrategyFEAGD&TMechanical DesignLeadershipCommunicationCollaboration

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odds of building a lasting career here

61Sponsors, lottery-bound
Cap-exempt (no lottery)0
Sponsors this role90
Entry-level history0
PERM / green-card track0
Lottery odds (Level IV)94
Fits your clock70

Sponsors, but it's cap-subject — you still face the weighted lottery (~61% per draw at Level IV). Good if you win; have a cap-exempt backup on your list.

Lottery odds assume a STEM candidate.

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H-1B wage level

the lottery is wage-weighted — each level is one more entry

Level IV · 4×
Level I$110,5101 entry
Level II$134,4932 entries
Level III$158,4543 entries
Level IV$182,4374 entries

This range already reaches Level IV — the maximum four lottery entries.

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.

Employer immigration record

from this employer's Department of Labor filings

Files H-1B transfers

4 transfer filings in the last year, covering 4 workers. Median labor-condition decision: 8 days. An employer that already files transfers is one that can take over an existing H-1B.

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 Principal Mechanical Engineer to serve as a company-level technical authority in a critical mechanical engineering domain for our Linear Generator platform.
  • Candidates who primarily shape technical direction across multiple teams or system areas may be better aligned to a Senior Staff Mechanical Engineer role.
  • Principal-level candidates should bring rare technical judgment in a company-critical domain and demonstrate impact that extends beyond individual projects, teams, or near-term program execution

Responsibilities

  • Lead company-critical technical direction in a mechanical engineering domain with high ambiguity, high consequence, and broad cross-functional impact.
  • Define or strongly influence technical architecture, design principles, standards, methods, and long-term product direction that affect product capability, reliability, cost, scalability, manufacturability, serviceability, and business outcomes.
  • Solve the organization's most difficult and unprecedented engineering problems, especially where existing methods, assumptions, or design approaches are insufficient.
  • Create durable organizational leverage through technical frameworks, review practices, architecture decisions, standards, methods, or risk approaches that improve how teams execute engineering work.

Requirements

  • BS, MS, or PhD in Mechanical Engineering or a similar engineering field, with a distinguished track record of solving high-consequence mechanical engineering problems in a company-critical domain.
  • Demonstrated ability to shape technical direction across major systems, platforms, product areas, or organizations, not only within a single project or team.
  • Exceptional mechanical engineering judgment, including the ability to balance product capability, reliability, cost, scalability, manufacturability, serviceability, safety, customer needs, and business priorities.
  • Proven ability to solve novel, ambiguous, cross-functional problems where requirements, ownership, evidence, methods, or tradeoffs are not initially clear.
  • Strong executive-level communication and influence skills, including the ability to align senior leaders and cross-functional stakeholders around technical strategy, risks, tradeoffs, and recommended direction.
  • Deep experience using analysis, testing, modeling, field learning, production learning, and engineering judgment to guide long-term technical strategy and high-consequence decisions.

Nice to have

  • Experience serving as a company-level technical authority, principal engineer, architect, or equivalent senior technical leader in a critical hardware domain.
  • Experience influencing long-term product strategy, platform architecture, reliability strategy, production scalability, field performance, cost reduction, or serviceability at an organizational level.
  • Experience advising senior leadership on technical investments, product tradeoffs, risk posture, technical debt, or long-term engineering strategy.
  • 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.

Benefits

  • Define evidence and learning strategies for high-consequence decisions, including the right mix of analysis, testing, modeling, field data, production learning, external expertise, and engineering judgment.

Company info

  • This role is intended for engineers who have already demonstrated broad technical leadership across multiple teams, systems, or major program areas and are now ready to create durable company-level technical leverage.
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This listing is sourced directly from Mainspring Energy's careers page and normalized into a canonical job model.