Senior Ruby On Rails Developer Jobs in Denver, CO

We're looking for seasoned full‑stack software engineers to join the teams behind Gusto's product platforms – the shared systems that our product teams build upon – to serve small business owners every day. As a Staff Software Engineer, you'll operate across the full lifecycle of foundational systems: shaping architecture early in the design process, building self‑service internal features and APIs, and owning their performance long after launch. That means engineering the core business engine, enabling product teams with reliable backend services, and setting the engineering standard for those around you.

• Design, build, and test Gusto core platform services – communications, reporting, dashboards, access, workflows, risk, payments, and compliance capabilities, among others
• Mentor other engineers to help solve some of the hardest technical problems in very complex domains and at a large scale
• Help scale one of the largest Ruby/Rails and JavaScript/React applications in the world
• Collaborate with Product Engineering, Product Management, Data, and Design teams to understand customer pain points, come up with solutions, and then prototype, iterate, and launch daily
• Build platforms that engineering teams rely on, and trust to deliver products that our customers genuinely love

• Successful applicants typically have 8+ years of software development experience
• Passion for creating scalable, efficient platforms for users
• Experience leveraging AI tools or systems to accelerate development, improve testing, and deliver new platform capabilities
• Curiosity and experimentation with emerging AI frameworks, applying and sharing best practices to evaluate and scale AI use safely across teams
• Experience owning multi‑quarter projects that solve complex engineering problems and make measurable user impact at scale
• Experience with large‑scale refactors, performance and reliability issues, and a strong sense of ownership over all aspects of your platform area
• Ability to mentor engineers to maximize their performance and impact

• Experience in, or interest working in, Ruby on Rails
• Appreciation for a collaborative, test‑driven environment
• Ability to build well‑structured, maintainable, well‑documented code
• Ability to effectively communicate across engineering teams and with business stakeholders
• Two day travel to a Gusto office for onboarding is required

Our cash compensation for this role is targeted at $163,000–$204,000 in Denver and most remote locations, and $197,000–$247,000 for San Francisco and 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.

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. 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.

Personal information collected and processed as part of your Gusto application will be subject to Gusto's Applicant Privacy Notice. Gusto takes security and protection of personal information very seriously. Please review our Fraudulent Activity Disclaimer.