Gusto
Senior Staff Software Engineer, Gusto Agent & Partner Experiences (API)
$213K–$278K
Denver, CO - Hybrid +3 · Senior Staff · Full-time · Posted Oct 14, 2026
- Location
- Denver, CO - Hybrid
New York, NY - Hybrid
San Francisco, CA - Hybrid
San Francisco, CA - Hybrid - Experience
- 12+ years of professional software development experience.
About the job
Leads engineering for Gusto’s API and agent-facing payroll platform, designing interfaces for developers and AI agents while shipping and scaling reliable software.
What you'll do
- Design API contracts and agent-facing tools for partners and AI agents.
- Build and ship clean, tested, performant code; resolve production issues and guide reliability and observability practices.
- Lead complex engineering initiatives, mentor engineers, and work with developer-customers and internal partners.
What they ask for
- 12+ years of professional software development experience, including technical ownership of organization-wide initiatives and a role in scaling engineering organizations.
- Expertise in Ruby and Rails, including experience with large Rails applications and multiple Ruby codebases.
- Experience designing and building platforms and public-facing APIs, with strong understanding of reliability and performance at scale.
- Experience mentoring and raising engineering standards across an organization.
Nice to have
- Payroll, tax, or fintech experience.
- Experience with agent-facing tooling, such as MCP servers, tool and function definitions, AI provider integrations, or GraphQL at scale.
Pay
USD $213,000 to $236,000 base salary (Denver & most remote locations); USD $251,000 to $278,000 base salary (San Francisco, New York and Seattle)
Tools
Ruby, Rails, MCP servers, GraphQL
AI focus
Design API contracts and tools that AI agents can reason about and use to act on payroll; engage with AI tools relevant to the role.
Model-written summary · the original posting is authoritative