Senior Software Engineer - Backend

• Design, build, and operate backend services that support our core product
• Improve system reliability, performance, and observability
• Work on real-time infrastructure that powers voice-based AI workflows
• Collaborate closely with frontend engineers, product, and founders
• Ship to production frequently and iterate based on customer needs and system behavior

Software Engineering, Artificial Intelligence (AI), Speech Technology, Logistics, Software Engineering, Application Programming Interface (API), Data Modeling, Product Support, Systems Reliability, Reliability Engineering, We are looking for a versatile and highly skilled Senior Backend Software Engineer to join our team. This person will 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 backend engineering experience, with a focus on building scalable systems
• Experience with Go or a strong willingness to work in Go in production
• Solid understanding of system design, APIs, data modeling, and service reliability
• Product-oriented mindset and comfort making tradeoffs in a fast-moving environment
• Experience operating and maintaining production services

• Join a world-class team of engineers and builders.
• Backed by top investors including a16z, Y Combinator, Base10, Prysm Capital and Eurazeo.
• Have ownership and autonomy of projects and are encouraged to ship.
• Comprehensive Benefits including healthcare, dental, vision coverage.
• Competitive salary + equity in a high-growth startup.

HappyRobot is the infrastructure for enterprises to build and orchestrate AI workforces. Our AI workers don’t just communicate through voice and email - they make decisions, take action, and run operations autonomously across entire enterprise systems. Born in Y Combinator (S23) and backed by a16z, Base10, Prysm Capital and Eurazeo with over $150M 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 inour manifesto., We take full responsibility for our work, outcomes, and team success. No excuses, no blame-shifting - if something needs fixing, we own it and make it better. This means stepping up, even when it’s not “your job.” If a ball is dropped, we pick it up. If a customer is unhappy, we fix it. If a process is broken, we redesign it. We don’t wait for someone else to solve it - we lead with accountability and expect the same from those around us.

Craftsmanship

Putting care and intention into every task, striving for excellence, and taking deep ownership of the quality and outcome of your work. Craftsmanship means never settling for “just fine.” We sweat the details because details compound. Whether it’s a product feature, an internal doc, or a sales call - we treat it as a reflection of our standards. We aim to deliver jaw-dropping customer experiences by being curious, meticulous, and proud of what we build - even when nobody’s watching.

We are “majos”Be friendly & have fun with your coworkers. Always be genuine & honest, but kind. “Majo” is our way of saying: be a good human. Be approachable, helpful, and warm. We’re building something ambitious, and it’s easier (and more fun) when we enjoy the ride together. We give feedback with kindness, challenge each other with respect, and celebrate wins together without ego.

Urgency with FocusCreate the highest impact in the shortest amount of time. Move fast, but in the right direction. We operate with speed because time is our most limited resource. But speed without focus is chaos. We prioritize ruthlessly, act decisively, and stay aligned. We aim for high leverage: the biggest results from the simplest, smartest actions. We’re running a high-speed marathon - not a sprint with no strategy.

Talent Density and MeritocracyHire only people who can raise the average; ‘exceptional performance is the passing grade.’ Ability trumps seniority. We believe the best teams are built on talent density - every hire should raise the bar. We reward contribution, not titles or tenure. We give ownership to those who earn it, and we all hold each other to a high standard. A-players want to work with other A-players - that’s how we win.

First-Principles ThinkingStrip a problem to physics-level facts, ignore industry dogma, rebuild the solution from scratch. We don’t copy-paste solutions. We go back to basics, ask why things are the way they are, and rebuild from the ground up if needed. This mindset pushes us to innovate, challenge stale assumptions, and move faster than incumbents. It’s how we build what others think is impossible.