Senior Staff Mechanical Engineer — Systems Architect

Doist; Menlo Park (CA); On-site; USD 140,000 - 210,000; Full time

Job summary

Mainspring is seeking a Senior Staff Mechanical Engineer to shape technical direction across multiple teams within our Linear Generator platform. You will guide system-level design decisions, resolve cross-functional tradeoffs, and identify risks that span projects, delivering architectural leverage through standards and validation strategies.

The role requires high autonomy, strong stakeholder alignment, and the ability to elevate design quality across the organization, moving beyond

Qualifications

• System-level design across multiple teams or domains.
• Ability to identify and mitigate cross-functional risks.
• Ownership of architectural standards and validation processes.
• Autonomy in shaping technical direction and decision quality.

Responsibilities

• Guide system-level design decisions across multiple teams, systems, or program areas.
• Identify risks not visible within individual projects and address them proactively.
• Create leverage through architecture, standards, validation strategy, and high-quality decisions.
• Frame ambiguous problems, align stakeholders, and improve decision quality across programs.
• Help teams avoid rework caused by weak assumptions or incomplete validation.

Skills

System-level design

Cross-functional collaboration

Technical ownership

Architecture & validation strategy

Job description

Mainspring is seeking a Senior Staff Mechanical Engineer to shape technical direction across multiple teams within our Linear Generator platform. You will guide system-level design decisions, resolve cross-functional tradeoffs, and identify risks that span projects, delivering architectural leverage through standards and validation strategies.

The role requires high autonomy, strong stakeholder alignment, and the ability to elevate design quality across the organization, moving beyond