Senior Mechanical Engineer

About Sandbar Sandbar is an interface company in New York City. We aim to augment individuals so we can each think, act, and move more freely. Our team has built SW, ML, and HW products across Meta, CTRL-labs, Google, Apple, Fitbit, Peloton, and Equinox. Our first product, Stream, is a self extension—a private voice ring and conversational interface. Stream has been featured in WSJ, Bloomberg, & Wired, and begins shipping in Summer '26. Join us in creating technology that extends human thinking. About 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. Responsibilities Define mechanical architecture of new productsOwn the mechanical design of key parts, subsystems, and full product assemblies, from concept through mass productionBuild and test prototypes fast; use the results to make clear design decisionsPackage electronics into a small wearable form factor, including PCBs, flexes, batteries, antennas, sensors, microphones, and hapticsDesign 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-upsDrive design for manufacturing and assembly (DFM/DFA) with contract manufacturers and part suppliersPlan and run mechanical validation and reliability testing (drop, tumble, ingress/water resistance, wear, fatigue, sweat/chemical exposure); lead root cause analysisBalance comfort, fit, durability, and cosmetics with Industrial Design for a product people wear all daySupport engineering builds at our manufacturing partners, including on-site factory supportDocument designs and decisions clearly, and help shape how our hardware team works Qualifications Bachelor's or Master's degree in Mechanical Engineering or a related field7+ years of mechanical design experience in consumer electronicsShipped at least one high-volume consumer electronics product through EVT → DVT → PVT → MPStrong 3D CAD skills (e.g., OnShape, Creo, or SolidWorks) and 2D drawings with GD&THands-on experience with tolerance analysis, DFM/DFA, and plastic and metal part designSolid knowledge of materials and high-volume manufacturing processesExperience working directly with contract manufacturers and suppliersClear written and verbal communication; comfortable in ambiguous, fast-moving environmentsMust have ability to travel internationally Nice to Have Experience shipping wearables (rings, watches, earbuds, fitness trackers, or similar)Experience with miniaturized assemblies, waterproofing, and small-battery or wireless-charging integrationExperience designing for human factors, fit, and comfort across a range of body sizesExperience with highly cosmetic parts and surface finishes (e.g., PVD, anodizing, polishing, coatings)Experience at an early-stage startup FTE Benefits Health, vision, and dental benefitsCompany-sponsored 401(k)Unlimited PTO and sick timeEarly stage equity Compensation Range: $150K - $210K