Staff Software Engineer, Gusto Pro Integrations

Denver, CO - Hybrid · New York, NY - Hybrid · San Francisco, CA - Hybrid · 8+ years experience · Hybrid · Posted Oct 9, 2026

At a glance

Experience: 8+ years experience
Workplace: Hybrid
Location: Denver, CO - Hybrid · New York, NY - Hybrid · San Francisco, CA - Hybrid

At Gusto, we're on a mission to grow the small business economy. We handle the hard stuff — payroll, health insurance, 401(k)s, and HR — so owners can focus on their craft and their customers. With teams in Denver, San Francisco, and New York, we support more than 500,000 small businesses nationwide and are building a workplace that reflects the people we serve.
All full-time employees receive competitive base pay, benefits, and equity (RSUs) — because everyone who helps build Gusto should share in its success. Offer amounts are determined by role, level, and location. Learn more about our Total Rewards philosophy.
AI is a fundamental part of how work gets done at Gusto. We expect all team members to actively engage with AI tools relevant to their role and grow their fluency as the technology evolves. AI experience requirements vary by role and will be assessed during the interview process.

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.
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).
This is a high-ownership role on a small, growing team where you'll have real input into what gets built next.

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

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
Excellent communication skills — able to explain technical tradeoffs to both engineers and cross-functional partners
AI-native mindset, with AI tools naturally embedded in your daily engineering workflow (code generation, review, debugging, documentation)

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