---
title: 'Staff Software Engineer, Gustie Assist at Gusto, Inc.'
canonical: 'https://feeny.ai/job/staff-software-engineer-gustie-assist-gusto-inc-denver-141g3n2kmrgw'
type: 'job'
last_seen: '2026-09-07'
---

# Staff Software Engineer, Gustie Assist at Gusto, Inc.

- **Company:** Gusto, Inc.
- **Location:** Denver, CO / New York New York, United States / San Francisco, CA
- **Work type:** hybrid
- **Posted:** 2026-08-14
- **Last confirmed live:** 2026-09-07
- **Apply:** https://job-boards.greenhouse.io/gusto/jobs/8095028

## Job description

## About Gusto

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](https://gusto.com/about/careers/total-rewards).

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.

Gustie Assist builds Otto, the AI agent that Gusto's support advocates rely on to solve customers' hardest payroll, benefits, and compliance problems. When a small business hits a wall and reaches out, the advocate turns to Otto: it reasons over the customer's full context, answers in the moment, and increasingly takes real actions across Gusto's systems on the advocate's behalf to make the customer whole. We're a small platform team building an agent that reasons, acts, and has to get it right when the stakes are someone's payroll.

This is unusually broad, hands-on applied-AI work: you'll own an LLM agent runtime and the full stack around it, including the tool layer that lets it act over Gusto's systems, the Rails/GraphQL backend, the advocate-facing frontend, and the eval system that keeps it trustworthy while it touches live customer accounts. We keep the path from idea to production short, and measure ourselves on customer outcomes, not model novelty.

Here's what you'll do day-to-day:

- Design and build across the Otto platform, including the runtime and agent graph, the tool/action layer, the Rails/GraphQL backend, and the advocate-facing experience, owning a meaningful slice end-to-end
- Expand what the agent can safely do: autonomous, tool-using actions with human-in-the-loop approval, built on a secure, auditable identity and permissions model
- Build the eval and observability systems (LLM-as-judge + deterministic scorers, offline gates and online production monitoring) that let us change the agent in production weekly without regressing correctness or escalation behavior
- Work directly with LLMs, including prompting, tool/function design, retrieval, and the feedback loops that turn real advocate interactions into a better Otto
- Partner closely with Product, Data, Design, and our CX teams to turn advocate and customer pain into shipped capabilities
- Mentor engineers and set the bar for how we build agentic systems responsibly and at scale

Here's what we're looking for:

- Typically 8+ years of software engineering experience, owning systems end-to-end
- You've built and shipped LLM-powered or agentic systems in production, including tool-calling/agents, retrieval, or evals, and you know where they break and how to make them reliable
- Strong full-stack range. Must be comfortable moving between backend services, an LLM runtime, and customer-facing product, and picking up whatever the problem needs
- Experience owning multi-quarter projects that make measurable user impact at scale
- Sound judgment about safety and blast radius when software takes real actions on real accounts
- Ability to mentor engineers and raise the bar around you

Also great to have:

- Experience with agent frameworks, evals/LLM-as-judge, retrieval, or MCP-style tool architectures
- Experience with Ruby on Rails and/or JavaScript/React (our stack), or the ability to ramp quickly
- Familiarity with GraphQL and federated backends
- Appreciation for a collaborative, test-driven, high-autonomy environment, and clear communication with engineering and business stakeholders

Gusto has physical office spaces in Denver, San Francisco, and New York City. Employees who are based in those locations will be expected to work from the office on designated days approximately 2-3 days per week (or more depending on role). The same office expectations apply to all Symmetry roles, Gusto's subsidiary, whose physical office is in Scottsdale.

Note: The San Francisco office expectations encompass both the San Francisco and San Jose metro areas.

When approved to work from a location other than a Gusto office, a secure, reliable, and consistent internet connection is required. This includes non-office days for hybrid employees.

Our customers come from all walks of life and so do we. We hire great people from a wide variety of backgrounds, not just because it's the right thing to do, but because it makes our company stronger. If you share our values and our enthusiasm for small businesses, you will find a home at Gusto.

Gusto is proud to be an equal opportunity employer. We do not discriminate in hiring or any employment decision based on race, color, religion, national origin, age, sex (including pregnancy, childbirth, or related medical conditions), marital status, ancestry, physical or mental disability, genetic information, veteran status, gender identity or expression, sexual orientation, or other applicable legally protected characteristic. Gusto considers qualified applicants with criminal histories, consistent with applicable federal, state and local law. Gusto is also committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. We want to see our candidates perform to the best of their ability. If you require a medical or religious accommodation at any time throughout your candidate journey, please fill out [this form](https://docs.google.com/forms/d/e/1FAIpQLSdEfl7Bp-Twz7LLlhGlha46CrxZ9Kacgakmarf3K2TbnaEgKQ/viewform) and a member of our team will get in touch with you.

Gusto takes security and protection of your personal information very seriously. Please review our [Fraudulent Activity Disclaimer](https://gusto.com/about/careers/fraudulent-activity-disclaimer).

Personal information collected and processed as part of your Gusto application will be subject to [Gusto's Applicant Privacy Notice](https://gusto.com/about/careers/applicant-privacy-notice).

## About Gusto, Inc.

## Company Overview
- **One-liner**: Gusto provides an all-in-one payroll, benefits, and HR platform that automates and simplifies the people side of running a small business.
- **Entity Type**: Private (bootstrapped to significant scale; no recent funding rounds disclosed)
- **Headquarters**: Denver, Colorado, USA (with offices in San Francisco, New York City, and Scottsdale, Arizona)
- **Founded**: 2012 (originally launched as ZenPayroll)
- **Founders**: Not publicly available in provided sources

## Core Business
- **Primary industry**: Human Resources / Payroll / Benefits technology
- **Target customers**: Small and medium-sized businesses (SMBs) across the U.S. (and Canada via EOR)
- **Mission or purpose**: “We’re making work meaningful for everyone, everywhere.” – Focused on helping small businesses take care of their teams.

## Products & Services
- **Payroll Processing (Core)**: Full-service payroll that automatically calculates, files, and pays taxes. Supports both W-2 employees and international contractors.
- **Benefits Administration**: Health insurance, 401(k) plans, commuter benefits, and other voluntary benefits integrated into the platform.
- **HR & Compliance Tools**: Hiring, onboarding, time tracking, PTO management, and compliance support (e.g., labor law posters, ACA reporting).
- **Employer-of-Record (EOR) for Canada**: Powered by Remote, allows U.S. businesses to hire full-time employees in Canada without a local entity.

All offerings are SaaS-based, delivered through a single integrated platform.

## Market Standing
- **Valuation/Market Cap**: Not publicly available (private company)
- **Key Metric**: Serves **more than 500,000 businesses** nationwide; processes tens of billions of dollars in payroll annually.
- **Notable Investors/Partners**: Not disclosed in provided sources
- **Growth Signals**:
  - Headcount: ~4,400 total employees, with ~1,200 in product & tech roles
  - Expanding into Canada via EOR partnership with Remote
  - Strong emphasis on AI integration to “absorb complexity” and improve customer experience

## Competitive Advantages
- **All-in-one platform**: Combines payroll, benefits, HR, and compliance in a single system, reducing the need for multiple vendors.
- **Automated tax filing and compliance**: Removes a major pain point for small business owners.
- **Customer obsession**: 9 out of 10 customer satisfaction rating; focus on serving an underserved market.
- **AI-first approach**: Uses AI to catch errors, answer questions, and streamline workflows, giving customers leverage without replacing human judgment.

## Strategic Focus
- **AI as a force multiplier**: Continued investment in AI to automate edge cases, improve speed, and enable higher-impact work for both customers and employees.
- **Expanding the platform**: Adding capabilities like EOR for Canada and deeper benefits integrations.
- **Scaling the small business economy**: Prioritizing features that help businesses grow and take care of their teams, with a long-term view of market leadership.

## Why Work Here
- **Culture values**: “Act with Bold Conviction,” “Raise the Bar, Learn Fast, Repeat,” “Customer Obsessed,” “Dream Big, then Make it Real.” Emphasis on directness, healthy debate, and ownership.
- **Work model**: Hybrid – most roles tied to hub locations (Denver, San Francisco, New York City, Scottsdale) with in-person collaboration **two days a week** (Tues/Wed for most; Wed/Thu in Scottsdale). Trusts employees to work remotely the rest of the time.
- **Benefits**: Comprehensive medical, dental, vision; family planning and fertility support; gender-affirming care; mental health support; paid vacation, sick leave, holidays, parental leave, and sabbaticals.
- **Community**: Employee-led affinity groups open to all; inclusive culture that values diversity.
- **Engineering culture**: Builders who enjoy untangling hard problems; high ownership; AI tools give engineers leverage to focus on judgment and creativity.

## Sources
1. [gusto.com/about](https://gusto.com/about) – Company overview, values, mission, headcount (500k+ businesses)
2. [gusto.com/about/careers](https://gusto.com/about/careers) – Culture, work model, benefits, AI philosophy
3. [gusto.com](https://gusto.com/) – Product details, pricing, features, customer stats
4. [job-boards.greenhouse.io/gusto](https://job-boards.greenhouse.io/gusto) – Current job openings (78 listed), departments
5. [builtin.com/company/gusto](https://builtin.com/company/gusto) – Employee count (4,405 total, 1,200 product+tech), office locations, hybrid policy

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