Retirement AI Senior Staff Engineer

Symmetry is the payroll infrastructure for software & payroll platforms powering the paychecks of over 64 million workers each year. Our fully integrated suite of payroll tax APIs and software tools allows companies to solve tax compliance issues and build applications across the entirety of the payroll process. 

About the Role:

You’ll be a key engineer helping us ship real, user-facing AI at Gusto Retirement. This role is all about bias to action: owning problems end-to-end, getting working software in front of customers, and iterating quickly. You’ll work closely with a small, senior team to implement language-model-powered experiences. If you like being hands-on, making pragmatic technical decisions, working closely with product & design partners, and turning ideas into production features, you’ll be a great fit.

About the Team:

We’re a small, focused AI product team building practical, high-impact experiences to help people save for retirement at Gusto Retirement. The team is senior, collaborative, and very execution-focused—PMs bring strong ideas, and we own the execution fully. We work closely with product, design, and partner engineering teams, but keep tight ownership of our priorities and roadmap.

Here’s what you’ll do day-to-day:

• Design, build, and ship production features that use large language models to solve real customer problems.


• Implement and integrate LLMs (prompting, tool loops, evaluation, monitoring, etc).


• Make pragmatic architecture decisions, de-risk tricky areas, and keep the work unblocked.


• Partner with product and design to refine ideas, shape scope, and iterate quickly on end-to-end experiences.


• Collaborate with other engineering teams to integrate with existing systems and unblock dependencies.


• Write clear, reliable, well-tested code that ships quickly and scales well.

Here’s what we're looking for:

• 10+ years of software engineering experience building and shipping production products or platforms


• Hands-on experience implementing LLM-powered features (e.g., RAG flows, agents, tool loops, workflow automation with language models, etc)


• Strong engineering skills (e.g., services, APIs, data flows); comfortable spending most of your time coding.


• Experience running or heavily contributing to a team’s execution: sprints, Jira, scoping, and cross-functional coordination.


• Bias to action: you default to trying things, iterating, and learning, rather than getting stuck in analysis or waiting for direction.


• Clear communicator who can work well with product, design, and other engineering teams without needing a formal management title.


• Experienced with Ruby on Rails (or any comparable language), React (or any comparable library).

Please note that travel to Gusto’s Denver office for onboarding is required for this position. If you have any questions regarding this requirement, please share with your recruiter.

Our cash compensation amount for this role is targeted at $213,000/yr to $236,000/yr in Denver & most remote locations, and $251,000/yr to $278,000/yr for San Francisco, Seattle & New York. Stock equity is additional. Final offer amounts are determined by multiple factors including candidate experience and expertise and may vary from the amounts listed above.

Symmetry has a physical office space in Scottsdale. 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).

When approved to work from a location other than the office, a secure, reliable, and consistent internet connection is required.

Working at Symmetry

Being happy at a job goes beyond just doing the work. Where you choose to spend 40 hours a week should be a place that challenges you professionally and aligns with your personal goals and well-being. We truly love what we do, and our customers love what we produce. Our family-owned and -operated business is collaborative, fun, and friendly. We offer the opportunity to work with all kinds of positions across the company, from the CEO to support to sales and everything in between.

Recently, Symmetry became part of Gusto. More than 400,000 businesses use Gusto’s people platform to hire, pay, insure, and support their team–from modern payroll and benefits to distributed work services and international contractor support to expert HR. Together, Symmetry and Gusto are pushing the entire industry forward by helping growing businesses access tools and services that for so long have only been available to larger corporations.

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 with us.

We are 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. Our company considers qualified applicants with criminal histories, consistent with applicable federal, state and local law. Our company 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 and a member of our team will get in touch with you.

We take security and protection of your personal information very seriously. Please review our Fraudulent Activity Disclaimer.

Personal information collected and processed as part of your Gusto application will be subject to Gusto's Applicant Privacy Notice.

About our products

Our products make sure millions of paychecks are right, no matter where people live or work in the U.S. We simplify the payroll process with accurate and dependable payroll withholding tax solutions. Our clients include Fortune 500 companies, like Walmart and Southwest Airlines, and leading payroll service providers, including ADP and Paychex. With a 95%+ customer retention rate, our products always have to be top-of-the-line, and so do our employees.

Symmetry is also the company behind the popular website PaycheckCity.com, which helps millions of Americans better understand their paychecks every month.