Senior/Staff Software Engineer

Sandbar; New York (NY); On-site; USD 150,000 - 210,000; Full time

Benefits offered by this job

Health benefits

401(k)

Unlimited PTO

Early stage equity

Job summary

Sandbar is seeking a strong generalist engineer in New York City to connect Stream to the software people use every day. You’ll own end-to-end integrations, shipping on real-time Python services alongside the founders and shaping how others build on Stream.

You’ll build reliable connections with OAuth, webhooks, and rate limits, while instrumenting integrations to catch breakages before users notice and contributing to the core backend and on-call rotations.

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 versioning, and vendor quirks.
• Understand software architecture well enough to work with applications you didn't write.
• Have integrated tools into an LLM agent that real users depend on, and been accountable for actions completing.
• Hands-on MCP experience.

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.

Skills

5+ years experience

Python

OAuth 2/OIDC

LLM integration

MCP experience

Generalist backend

Communication

Job description

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 versioning, and vendor quirks
• Understand software architecture well enough to work with applications you didn't write
• Have integrated tools into an LLM agent that real users depend on, and been accountable for actions completing
• Hands-on MCP experience
• Generalist range across backend, auth, client code, and agent logic; can take an open-ended problem to a shipped result without a spec
• Product sense for software that acts on someone’s behalf, including when the user isn’t looking at a screen
• Communicate precisely and make tradeoffs explicit

Nice to have

• Connector or plugin work at an AI product
• Browser automation (e.g. Playwright, Chrome DevTools Protocol)
• Integration security: scoped credentials, secret storage, prompt-injection defenses, audit logging
• Voice or multimodal assistant experienceDeveloper documentation other engineers have built on

FTE Benefits

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