Staff Software Engineer, PEO Benefits
Staff full-stack engineer building greenfield PEO Benefits systems at Gusto, including benefits shopping flows, carrier integrations, and AI-automated support tools. Requires 8+ years experience owning complex, cross-functional projects end-to-end at scale, plus strong mentoring and AI fluency.
About the job
Responsibilities
- Design, build, and test the Gusto PEO Benefits experience including benefits shopping and plan-recommendation flows, carrier integrations, MCP tools, and agents that automate operational and customer support processes.
- Mentor other engineers to solve the hardest technical problems in complex domains at large scale.
- Help scale one of the largest Ruby/Rails and JavaScript/React applications in the world.
- Collaborate with Product Management, Data, Design, and Platform Engineering teams to understand customer pain points, prototype, iterate, and launch solutions.
- Build products that customers genuinely love.
- Operate across the full product lifecycle: shaping features from early spec and design through launch and long-term iteration, including writing clean frontend code, designing reliable backend APIs, influencing product direction, and owning post-launch outcomes.
- Leverage AI tools or systems to accelerate development, improve testing, and deliver new product capabilities.
- Experiment with emerging AI frameworks, applying and sharing best practices to evaluate and scale AI use safely.
Requirements
- 8+ years of software development experience.
- Experience owning multi-quarter projects that solve complex engineering problems and make measurable customer impact at scale.
- Experience driving large, cross-functional projects end-to-end through ambiguity, including scoping, sequencing, unblocking, aligning stakeholders, and working with multiple teams.
- Experience leveraging AI tools or systems to accelerate development, improve testing, and deliver new product capabilities.
- Curiosity and experimentation with emerging AI frameworks, applying and sharing best practices to evaluate and scale AI use safely across teams.
- Ability to mentor engineers to maximize their performance and impact.
- Ability to build well-structured, maintainable, well-documented code.
- Ability to effectively communicate across engineering teams and with business stakeholders.
- Travel to Gusto's office for onboarding is required.
Nice-to-Haves
- PEO Expertise: 3+ years of experience with PEO, with direct experience building PEO flows in a high-growth environment.
- Experience in, or interest in working in, Ruby on Rails.
- Appreciation for a collaborative, test-driven environment.
Skills
Ruby on Rails, JavaScript, React, AI Tools, Frontend Development, Backend Apis, Mentoring
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