Staff Software Engineer, Gusto Pro

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About the position

As a Staff Software Engineer on Gusto Pro Integrations, you'll build and own integrations between Gusto and the third-party tools accounting firms already use to run their practice. The team maintains a growing portfolio of integrations today (including our Bookkeeping integrations), and we expect that portfolio to keep expanding as the team grows what \"integrations\" means for Gusto Pro. You'll work hands-on across the stack (Ruby on Rails, Sidekiq), including evaluating both traditional API integrations and emerging AI agent protocols like MCP (Model Context Protocol), while partnering closely with Product, Design, and Data Science to make sure every integration fits naturally into how accountants actually work. This is a high-ownership role on a small, growing team: the Integrations roadmap ahead isn't fully defined yet, and you'll have real input into what gets built next.

Responsibilities

  • Own and extend Gusto's existing third-party integrations and help build out new ones as the portfolio grows
  • Design and build reliable backend services (Ruby on Rails, Sidekiq) that sync data between Gusto and partner platforms
  • Evaluate and help build new integration patterns — including AI agent protocols like MCP — as we expand beyond traditional API integrations
  • Help define the technical approach and roadmap as the Integrations domain grows
  • Partner with Product, Design, and Data Science to validate accountant workflows and iterate based on feedback
  • Participate in code review and help set the technical bar for a team that's still establishing its engineering practices
  • Mentor other engineers as the team scales

Requirements

  • 8+ years of professional software development experience
  • Experience owning multi-quarter projects end-to-end — scoping, planning, execution, stakeholder management, and launch
  • Strong platform/application engineering background: services, APIs, third-party integrations, data flows, observability
  • Comfortable operating in an ambiguous, early-stage domain where the roadmap isn't fully written yet
  • AI-native mindset, with AI tools naturally embedded in your daily engineering workflow (code generation, review, debugging, documentation)
  • Excellent communication skills — able to explain technical tradeoffs to both engineers and cross-functional partners

Nice-to-haves

  • Ruby on Rails experience strongly preferred; experience with OAuth and third-party API integrations a plus
  • Familiarity with AI agent protocols (e.g., MCP) or agentic integration patterns is a plus

Benefits

  • Competitive base pay
  • Benefits
  • Equity (RSUs)
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