Staff Software Engineer, Invoicing and Billing

Gusto

. Design, build, and test Gusto's core billing platform, including usage jobs, subscriptions, orders, invoice generation, payments, reporting, and accounting integrations .

Posted 9/25/2026full-timeSan Francisco • California • United StatesLead💰 $197,000 - $247,000 per yearWebsite

Tech Stack

Tools & technologies

Distributed SystemsJavaScriptReactRubyRuby on Rails

About the role

Key responsibilities & impact

Design, build, and test Gusto's core billing platform, including usage jobs, subscriptions, orders, invoice generation, payments, reporting, and accounting integrations
Mentor engineers solving complex technical problems at large scale
Help scale Gusto's Ruby/Rails and JavaScript/React applications
Collaborate with Product Engineering, Product Management, Data, and Design teams to understand customer pain points and develop solutions
Prototype, iterate, and launch products daily
Build products customers value
Shape architecture early in the design process
Improve and maintain a high-throughput transactional billing platform
Build self-service internal features and APIs
Own platform performance after launch
Enable product teams to launch new products and support billing models such as multi-entity and multi-currency anniversary billing

Requirements

What you’ll need

8+ years of software development experience
Experience leveraging AI tools or systems to accelerate development, improve testing, and deliver new platform capabilities
Curiosity and experimentation with emerging AI frameworks
Experience building large high-throughput distributed systems
Experience in the commerce domain, including invoicing, commerce, payment processing, or revenue recognition
Experience owning multi-quarter projects solving complex engineering problems with measurable user impact at scale
Experience with large-scale refactors, performance and reliability issues, and ownership of a platform area
Ability to mentor engineers
Experience in, or interest in working in, Ruby on Rails
Ability to communicate effectively across engineering teams and with business stakeholders
Ability to work from the San Francisco or San Jose metro area and in the office approximately 2–3 days per week

Benefits

Comp & perks

Competitive base pay
Health insurance
401(k)
Equity (RSUs)
Onboarding travel to Gusto's office
Secure, reliable, and consistent internet connection required when working outside a Gusto office
Reasonable accommodations for qualified individuals with disabilities and disabled veterans