Frontend Full Stack Staff Software Engineer (AI Platform Experiences)

• We’re hiring an experienced full stack engineer to help small businesses work better with AI
• You’ll build Gus, Gusto’s AI-powered assistant, and create scalable solutions that serve millions of users
• As a Software Engineer at this level, you’ll own projects end-to-end from initial specs to deployed features—working at the intersection of modern AI capabilities and real business needs
• The Core Experience - AI Experiences team owns Gus, Gusto’s AI-powered assistant, and the platform that enables teams across Gusto to deliver AI-native experiences to customers across web, mobile, voice, email, and agent-based channels
• You’ll work within Gusto’s AI platform infrastructure, collaborating closely with sister teams who own the underlying agent framework
• Your focus is building experiences and enabling product teams to extend and scale within the platform
• This work is directly tied to Gusto’s top priorities
• We operate with fast iteration cycles, deep cross-functional collaboration, and high ownership
• Architect, build, and test technologies supporting AI experiences within Gusto’s product suite
• Create standardized, self-serve patterns that enable product teams to extend Gus across web, voice, email, and agent-based experiences
• Collaborate with ML and product teams on prompt engineering, clarifying question flows, and escalation logic—using A/B tests and data to drive improvements
• Mentor engineers on complex technical challenges in AI, scalability, and platform infrastructure
• Help scale a large Ruby/Rails and React application serving millions of users
• Work with Product, Design, Security, and Technical Operations teams to understand customer needs, develop solutions, and launch features
• Build customer-facing products end-to-end that customers rely on every day

Benefits

• Gender-affirming care and support
• Family care and support, including family planning and fertility benefits
• A variety of mental health resources
• Medical, dental, and vision insurance for employees and dependents
• Free meals and refreshments at the office (conversation and community is an added bonus!)
• Paid vacation, sick time, bereavement, and holidays, paid leaves, sabbatical, and more- Experience building internal platforms or developer-facing infrastructure that enables other teams to self-serve and ship AI-powered features
• 8+ years of software development experience, with 4+ years building scalable platforms or high-impact customer-facing products
• Track record of owning multi-quarter projects that solve complex engineering problems and deliver measurable customer impact at scale
• Excellent cross-functional communication skills with ability to mentor engineers and collaborate effectively across teams and stakeholders
• Strong foundation in front-end engineering and modern web technologies (Ruby on Rails, React, GraphQL, or similar full-stack frameworks) with ability to build well-structured, maintainable code
• Bonus if you have AI platform development experience or strong learning orientation toward AI technologies, patterns, and frameworks (orchestration, evals, prompt systems—not ML model development)
• Product-minded, customer-facing engineering approach with passion for creating great customer experiences and ownership over performance, reliability, and quality