Senior Software Engineer, AI-Powered HR Platform

Gusto; San Francisco (CA); On-site; USD 169,000 - 235,000; Full time

Job summary

Gusto is seeking a Staff Software Engineer to architect and build PeopleOS, our AI-native internal HR platform, and related tools that power the People tech ecosystem. You will shape how Gusties experience HR from recruiting to offboarding with a hands-on full-stack approach.

The role requires 7+ years of production software experience in Python or TypeScript/Node.js, REST API mastery, and a track record of integrating SaaS platforms. This is a hybrid role with offices in Denver, SF, and NY.

Qualifications

• 7+ years of full-stack software engineering experience with production-quality work in Python, TypeScript/Node.js, or both.
• Strong experience building and consuming REST APIs — including OAuth flows, rate limiting, pagination, and error handling.
• Demonstrated ability to integrate SaaS platforms (bonus: Workday, Greenhouse, Slack, or Google Workspace).
• Comfort with AI/LLM API integration — Anthropic Claude, OpenAI, or equivalent — including prompt design and response parsing.
• Experience shipping internal tools or developer tooling with real end users and feedback loops.
• Strong written communication: document APIs, write tech specs, and explain trade-offs to non-engineers.
• Understanding of HR data sensitivity and data retention guidelines.

Responsibilities

• Be the technical owner for PeopleOS, our internal AI-powered HR platform, and related tools.
• Collaborate with People Ops to translate workflows into production software, including design, implementation, UAT support, and releases.
• Design, build, test, and maintain integrations across Workday, Greenhouse, Slack, and Google Workspace.
• Develop MCP servers to give AI agents structured access to People Systems data.
• Design prompts and ensure safe, reliable AI-assisted workflows for People Ops use cases.

Skills

Full-stack engineering

Python

TypeScript

Node.js

REST APIs

OAuth

SaaS integrations

AI API integration

Developer tooling

Documentation

Tools

Workday

Greenhouse

Slack

Google Workspace

Job description

Gusto is seeking a Staff Software Engineer to architect and build PeopleOS, our AI-native internal HR platform, and related tools that power the People tech ecosystem. You will shape how Gusties experience HR from recruiting to offboarding with a hands-on full-stack approach.

The role requires 7+ years of production software experience in Python or TypeScript/Node.js, REST API mastery, and a track record of integrating SaaS platforms. This is a hybrid role with offices in Denver, SF, and NY.