Senior Fullstack Engineer

Circleback; San Francisco (CA); On-site; USD 120,000 - 180,000; Full time

Job summary

Circleback is building the source of truth for everything said at a company—starting with AI meeting notes, action items, and search.

We ship fast with a small team across web, desktop, mobile, and backend, delivering real features to thousands of paying customers weekly.

Qualifications

• 3–5 years of software engineering experience, shipping features end-to-end.
• Ability to balance product and technical decisions.
• Comfort with fast-moving startups and ambiguity.

Responsibilities

• Build across web (React, Next.js), desktop (Electron, Swift), mobile (React Native), and backend.
• Ship real features to thousands of paying customers weekly.
• Experiment with AI models and build reusable tooling; contribute via code reviews.

Skills

React

Next.js

React Native

Product sense

Detail oriented

Tools

Electron

Swift

Node.js

AI basics

Job description

What you\'ll do

You\'ll take on a problem, figure out the right approach, build it across the full stack, and ship it. That requires good judgment. It means understanding how a feature connects to everything else, both technically and from a product standpoint. Our foundations stack on each other: better transcription means better AI outcomes, which means better search and automations. An engineer who builds in isolation here will build the wrong thing.

You\'ll ship across web (React, Next.js), desktop (Electron, Swift), mobile (React Native), and backend. You\'ll work on AI-powered outcomes, search, transcription, on-device recording, performance, and automations. You\'ll experiment with new AI models and techniques. And you\'ll raise the bar for the team through code review and building reusable tools.

We\'re a small team that moves fast. You\'ll ship real features to thousands of paying customers every week, not sit in planning meetings.

Who you are

3-5 years of experience building and shipping software, preferably at startups. You\'ve made real decisions, not just about implementation, but about what the right product and technical approach was.

An eye for detail. Strong opinions about how things should work. The kind of person who thinks about how something fits into the bigger picture, not just whether the code works.

Drawn to work that compounds. Curious how great products work.

AI-native. The way software gets built is changing fast (exciting). Not just keeping up, but at the frontier. Always looking for ways to get better at doing the work, not just doing the work.

About the interview

1. Initial screen (30min)

2. Technical interview (1h)

3. Technical interview (1h)

4. Paid, in-person work trial (2-3d)

About Circleback

Circleback is building the source of truth for everything said at a company–starting with best-in-class AI meeting notes, action items, and search.

Every meeting will be AI-enabled. But meeting notes are just the beginning. We\'re building toward something larger: a platform that captures, organizes, and actions on the context from all conversations across a company–meetings, calls, emails–so teams can actually use what they know.

We\'re a small team backed by Y Combinator. Profitable, growing virally, and thousands of paying customers including PostHog, Browserbase, Gumloop, and more.

Why join

• We ship fast with a high bar for quality

• Small team, large problem–the product category we\'re building didn\'t exist until recently

• Profitable and growing virally through word of mouth

• Software that people actually love and use daily

If you care about craft and want to build something ambitious with a small team that moves quickly, we\'d like to hear from you.