Senior/Staff Software Engineer

About this role

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, is private voice ring that extends your thinking. Stream has been featured in WSJ, Bloomberg, Wired, and Time's Best Inventions of the Year.

Join us in creating technology that extends human thinking.

About
We’re looking for a strong generalist engineer to connect Stream to the software people already use. Stream is a self extension that listens, remembers, and helps you think through conversation, and the more of your world it can reach, the more useful it becomes.

Most software wasn’t built to work with an AI. Making it work means understanding how each application is built, finding the most reliable way in, and making that connection dependable for people who rely on it every day. You’ll own this work end to end, work directly with the founders, ship on the same real-time Python services the rest of Stream runs on, and help shape how others build on Stream.

Responsibilities

• Build integrations between Stream and the apps, services, and AI tools people already use
• Design how tools plug into Stream’s agent: tool definitions, result shaping, confirmation, and context passing
• Own the integration layer end to end: OAuth and token lifecycle, least-privilege scopes, webhooks, rate limits, retries, and real-world failure modes
• Build and operate MCP servers and clients in production
• Work out reliable integrations for software without clean APIs
• Instrument every integration so breakage is caught before users notice
• Carry a share of the core backend and its on-call rotation

Qualifications

• 5+ years building software, with strong Python and comfort owning a live, real-time service
• Have shipped third-party integrations in production: OAuth 2/OIDC, token refresh and revocation, webhooks, API ver...