Sandbar builds the Stream smart ring and companion app that let users capture and interact with AI-powered voice notes on the go.
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 ML/AI Engineer to build Stream, a new conversational interface. As an ML/AI engineer, you will architect, build, and deploy a new interface which spans voice, audio, and agentic control. This role is perfect for someone who cares deeply about real-world ML deployment and low-latency voice interactions. Responsibilities - Design and improve user-facing experiences, including voice, audio, and agentic control. - Develop, evaluate, and deploy models spanning cloud models to resource-constrained on-device settings - Optimize inference pipelines for latency, reliability, and concurrency - Work closely with other ML/AI engineers, infrastructure engineers, designers, and cofounders on existing and future products Qualifications - 4+ years in artificial intelligence or machine learning applications - Experience shipping ML-based products is required - Experience in large-language models is required - Experience in audio / voice ML is a major plus - Comfortable writing production-grade software - Passion for human-computer interaction FTE Benefits - Health, vision, and dental benefits - Company-sponsored 401(k) - Unlimited PTO and sick time - Early stage equity