Senior Software Engineer - Full-Stack

HappyRobot is the infrastructure for enterprises to build and orchestrate AI workforces. Our AI workers don't just communicate - they make decisions, take action, and run operations autonomously across voice, email, and enterprise systems. Born in Y Combinator (S23) and backed by a16z and Base10 with over $60M raised, we power critical operations for global enterprises worldwide.

Our platform is battle-tested in the most demanding environments - where AI has real consequences. We started in logistics, built our own voice stack, models, and orchestration layer from the ground up, and are now bringing that infrastructure to every enterprise that runs the real economy. Learn more about our vision in our manifesto.

At HappyRobot, Full Stack Engineers own meaningful parts of the product and infrastructure end-to-end.

We’re looking for builders who thrive in ambiguity, care deeply about craft, and want real ownership over what they create.

• 5+ years of professional experience

• Strong generalist — you’re excellent on either the front end or back end, and comfortable working across the stack

• Front-end expertise with TypeScript and Next.js, including performance, UX, and clean architecture

• Back-end experience with Go, building reliable, scalable systems

• Product-minded engineer who understands tradeoffs between speed, quality, and scale.

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  Build and own entire sections of the product, including major parts of the web application

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  Design, implement, and ship features end-to-end — from UI to APIs to infrastructure

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  Help optimize and scale our voice AI infrastructure, improving latency, reliability, and cost

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  Collaborate closely with founders and teammates to shape product direction

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  Ship to production frequently and iterate based on real user feedback