Sr. Product Design Engineer
Senior Product Design Engineer owning end-to-end mechanical design of rugged wearable construction hardware—enclosures, sealing, thermal, and camera optical alignment—using parametric CAD and DFM tools from concept through volume production.
- Compensation
- $175K–$225K / yr
- Location
- San Francisco, USA
- Work setup
- Not specified
- Seniority
- Senior
- Employment
- Contract
- Experience
- 5+ years
- Category
- Design
- Posted
Skills
Must have
- 5+ years designing and shipping physical products, with at least one full product lifecycle in wearables, cameras, or ruggedized hardware
- Deep experience designing camera integration and optical alignment systems in production
- Experience shipping wearable products designed for all-day body use
- Deep expertise in rugged electromechanical device design including sealing, gasketing, and thermal management
- Strong experience designing parts for mass production: sheet metal, injection-molded plastics, custom castings
- Hands-on experience with contract manufacturers through DFM reviews, FAI, tooling qualification, and production ramp
- Proficiency with parametric CAD (Onshape, SOLIDWORKS, NX, Creo) and tolerance analysis, FEA, DFM tools
- Strong cross-functional collaboration with electrical and firmware engineers on PCBA integration and system-level architecture
- Background in Mechanical Engineering, Product Design Engineering, or related field
Nice to have
- Experience shipping wearable products at consumer volumes (Fitbit, Oura, Whoop, GoPro, Apple, Meta, Snap, etc.)
- Experience designing IP65+ rated devices for outdoor or industrial use
- Experience with drop, vibration, and environmental test design and validation
- Experience with high-volume injection molding, tooling strategy, and mold flow analysis
- Ability to generate clear technical documentation for internal teams, CMs, and executives
- Familiarity with contract manufacturers in Taiwan, mainland China, or Southeast Asia
- Experience designing helmets, headwear, PPE, or other head-mounted wearable products
- Experience with FCC, CE, or other regulatory certification processes for wearable devices
- Experience with battery pack and optical subassembly mechanical integration
- Familiarity with electrical CAD tools (Altium, KiCad, Eagle) for cross-functional collaboration
- Prior experience as early mechanical/PDE hire at a hardware startup that scaled to full production
Full description
About Ironsite
Ironsite is building the intelligence layer for the physical world. We design our own wearable hardware, deploy it alongside craft workers, and transform a shift's footage into a next-morning report. Our internal team and purpose-built models label the data overnight and deliver actionable insights to superintendents by 5 AM.
We are accelerating the speed, efficiency, and predictability of construction, especially for complex, mission-critical infrastructure projects, including data centers, LNG facilities, sports stadiums, hospitals, and other large-scale developments, by training AI models on egocentric construction footage and labor productivity data. We are built with a pro-worker philosophy at our core: we believe technology should empower the workforce, not replace it. We're working to give craft workers and project leaders better visibility into what's happening on-site, while creating a system where the reality of construction and the chaos of each day are finally available to the people running the project.
Ironsite is deployed across several of the largest active construction projects in the country. To date, we've captured more than 100,000 hours of construction footage across seven states, now process thousands of hours of site activity every day, and maintain a worker opt-out rate below two percent. This is enabled by a workforce-first architecture that anonymizes devices, captures no audio, and never releases raw video.
Ironsite is backed by leading investors (8VC, South Park Commons, Saga Ventures) and prominent operators across technology and construction, including Eric Schmidt, Jeff Dean, Jeff Rothschild, Mark Leslie, Scott Wu, Eric Glyman, Karim Atiyeh, Russell Kaplan, and others, alongside over a dozen construction industry operators who have joined us as partners in building this.
Longer term, we believe Ironsite is the foundation for what construction becomes in the next decade. The systems we're building will be the operating system for how the physical world gets built. We see a future where craft workers are more valued, more visible, and better paid for the skill they bring, and where the industry finally has the intelligence layer that makes autonomous construction possible. Both start with the same foundation.
The Role
We're hiring a Senior Product Design Engineer to own the mechanical design and product architecture of Ironsite's wearable hardware.
This is a foundational role on the hardware team. You'll design the enclosures, mechanisms, mounts, and thermal systems that let Ironsite's cameras and electronics survive on active jobsites, on ruggedized wearables that spend all day exposed to dust, moisture, impact, temperature extremes, and the kind of abuse most consumer wearables never see. Fit, ergonomics, sealing, thermal performance, drop and vibration resilience, and manufacturability are all important for this role. If the mechanical design doesn't hold up, nothing else does.