Senior Mechanical Engineer (Apparel & Accessories)

At WHOOP, we’re on a mission to unlock human performance and healthspan. As a member of the Apparel & Accessories team, you’ll shape the future of wearable technology by creating innovative, high-performance products that integrate seamlessly into users’ lives.

We are looking for a Senior Mechanical Engineer to lead the mechanical design and development of next-generation WHOOP bands and wearable accessories. In this role, you will own complex design challenges, drive cross-functional integration, and directly impact the user experience of WHOOP’s physical products. You will also play a key role in reducing manufacturing risk through second sourcing efforts and supplier engagement.

• Lead the mechanical design of new WHOOP bands and accessories from initial concept through production ramp, owning form, fit, and function of critical components.
• Drive product architecture decisions in partnership with Industrial Design, Electrical Engineering, Product Management, and Operations to ensure robust, user-centered solutions.
• Create and manage high-fidelity CAD models, assemblies, and detailed 2D documentation for both internal design reviews and external manufacturing partners.
• Spearhead second sourcing and dual tooling efforts for critical mechanical components to ensure supply chain resilience and reduce manufacturing risk.
• Define and execute validation test plans; apply root-cause analysis to field and manufacturing issues and implement design improvements.
• Provide technical leadership during design reviews, manufacturing builds, and supplier engagements, both domestic and international.
• Establish and maintain material specifications, DFM/DFA standards, and mechanical design best practices within the team.
• Mentor junior engineers, sharing expertise in mechanical design, prototyping, and cross-functional product development.
• Up to 20% travel to contract manufacturers and suppliers.

• B.S. in Mechanical Engineering or related field; M.S. a plus.
• 6+ years of mechanical design experience, with ownership of multiple products through full development cycles. Must demonstrate deep technical fluency in end-to-end product development, including concept creation, prototyping, design iteration, DFM/DFA, EVT/DVT/PVT, and production support.
• Strong proficiency in 3D CAD (e.g., SolidWorks, Creo) for both concept modeling and detailed production-level design; experience with tolerance stack-ups and drawing standards required.
• Extensive experience with a range of materials and processes, including plastics, silicones, textiles, elastomers, and overmolding; prior work integrating soft goods and electronics is highly desirable.
• Proven success working with and managing global suppliers and manufacturers, including qualification and ramp-up support.
• Demonstrated ability to lead cross-functional initiatives and influence decision-making across teams.
• Excellent communication and organizational skills; ability to balance technical depth with strategic execution.
• Experience working with offshore manufacturing partners preferred.
• Knowledge of wearables, sports/fitness accessories, or human factors engineering preferred.
• Familiarity with FEA tools, rapid prototyping, and environmental testing preferred.

This role is based in the WHOOP office located in Boston, MA. The successful candidate must be prepared to relocate if necessary to work out of the Boston, MA office. 

Interested in the role, but don’t meet every qualification? We encourage you to still apply! At WHOOP, we believe there is much more to a candidate than what is written on paper, and we value character as much as experience. As we continue to build a diverse and inclusive environment, we encourage anyone who is interested in this role to apply.

WHOOP is an Equal Opportunity Employer and participates in E-verify to determine employment eligibility.  It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.