Senior Mechanical Engineer

Join us in creating technology that extends human thinking.

We're looking for a Senior Mechanical Engineer to own the mechanical design of our wearable products.. You'll take parts and assemblies from concept through prototyping, EVT/DVT/PVT, and into mass production. You'll work closely with our Electrical, Firmware, Industrial Design, Quality, and Operations teams, as well as our contract manufacturers and suppliers.

This role is perfect for a hands-on engineer who has shipped high-volume consumer electronics, loves the challenge of packing a lot into a very small space, and wants real ownership at an early-stage company.

About Sandbar

About Sandbar

• Sandbar is an interface company in New York City. We aim to expand human thinking. Our team has built software, ML, hardware, and consumer products across Meta, CTRL-labs, Apple, Peloton, and Equinox.
• Our first product is Stream, a private voice ring that extends your thinking. Stream has been featured in WSJ, Bloomberg, Wired, and Time's Best Inventions of the Year.

Responsibilities

Define mechanical architecture of new products

• Own the mechanical design of key parts, subsystems, and full product assemblies, from concept through mass production
• Build and test prototypes fast; use the results to make clear design decisions
• Package electronics into a small wearable form factor, including PCBs, flexes, batteries, antennas, sensors, microphones, and haptics
• Design plastic, metal, and elastomer parts for high-volume manufacturing (e.g., injection molding, insert/overmolding, CNC, MIM, stamping)
• Release production-ready 3D CAD and 2D drawings with GD&T; run tolerance stack-ups
• Drive design for manufacturing and assembly (DFM/DFA) with contract manufacturers and part suppliers
• Plan and run mechanical validation and reliability testing (drop, tumble, ingress/water resistance, wear, fatigue, sweat/chemical exposure); lead root cause analysis
• Balance comfort, fit, durability, and cosmetics with Industrial Design for a product people wear all day
• Support engineering builds at our manufacturing partners, including on-site factory support
• Document designs and decisions clearly, and help shape how our hardware team works

Requirements

• Bachelor's or Master's degree in Mechanical Engineering or a related field
• 7+ years of mechanical design experience in consumer electronics
• Shipped at least one high-volume consumer electronics product through EVT → DVT → PVT → MP
• Strong 3D CAD skills (e.g., OnShape, Creo, or SolidWorks) and 2D drawings with GD&T
• Hands-on experience with tolerance analysis, DFM/DFA, and plastic and metal part design
• Solid knowledge of materials and high-volume manufacturing processes
• Experience working directly with contract manufacturers and suppliers
• Clear written and verbal communication; comfortable in ambiguous, fast-moving environments
• Must have ability to travel internationally

Preferred

• Experience shipping wearables (rings, watches, earbuds, fitness trackers, or similar)
• Experience with miniaturized assemblies, waterproofing, and small-battery or wireless-charging integration
• Experience designing for human factors, fit, and comfort across a range of body sizes
• Experience with highly cosmetic parts and surface finishes (e.g., PVD, anodizing, polishing, coatings)
• Experience at an early-stage startup

Benefits

• Health, vision, and dental benefits
• Company-sponsored 401(k)
• Unlimited PTO and sick time
• Early stage equity