Senior Mechanical Engineer (NPI, Apparel & Accessories)

Job Description

Job Description

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

WHOOP operates with urgency because our mission demands it. We build products for people who push their limits—and we hold ourselves to the same standard. We expect engineers to go deep technically, collaborate relentlessly, and take pride in execution. The pace is fast, expectations are high, and the work is deeply meaningful. This isn’t a role where you follow a blueprint. If you’re energized by complex challenges, cross-functional collaboration, and the opportunity to ship hardware at scale, this role will push you—and reward you.

We are seeking a talented and driven Senior Mechanical Engineer to own the mechanical design and development of next-generation WHOOP bands and wearable accessories. This individual will play a critical role in creating robust, scalable, and manufacturable hardware solutions that meet the needs of a fast-paced and highly collaborative product development environment.

• 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, metals, 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.
• Passion for product development and attention to detail.
• 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

The WHOOP compensation philosophy is designed to attract, motivate, and retain exceptional talent by offering competitive base salaries, meaningful equity, and consistent pay practices that reflect our mission and core values.

At WHOOP, we view total compensation as the combination of base salary, equity, and benefits, with equity serving as a key differentiator that aligns our employees with the long-term success of the company and allows every member of our corporate team to own part of WHOOP and share in the company’s long-term growth and success.

The U.S. base salary range for this full-time position is $130,000-$185,000. Salary ranges are determined by role, level, and location. Within each range, individual pay is based on factors such as job-related skills, experience, performance, and relevant education or training.

In addition to the base salary, the successful candidate will also receive benefits and a generous equity package.

These ranges may be modified in the future to reflect evolving market conditions and organizational needs. While most offers will typically fall toward the starting point of the range, total compensation will depend on the candidate’s specific qualifications, expertise, and alignment with the role’s requirements.