> Markdown version of [/jobs/ext/4620915-staff-software-engineer-full-stack-rails-react-new](https://www.wearedevelopers.com/jobs/ext/4620915-staff-software-engineer-full-stack-rails-react-new). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Staff Software Engineer - Full Stack Rails & React NEW

- **Company:** Briefed Inc.
- **Location:** Los Angeles, CA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), Artificial Intelligence, Code Coverage, Django Web Framework, Python (Programming Language), Node.Js, Ruby on Rails, Software Engineering, TypeScript, Web Applications, ReactJS, System Availability, Low Latency, Codebase, Front End Software Development, Code Restructuring
- **Published:** November 7, 2026
- **Apply:** https://www.juju.com/job/28_25303_b6aefd3f9ce21d341b83622900762ddd

## About the Role

* 10+ years of professional software engineering experience with deep full-stack architecture depth.
 * Large-Scale Full-Stack Mastery: Demonstrated experience building and operating high-throughput web applications using modern backend technologies (Ruby on Rails preferred, Python/Django, Node.js) and frontend ecosystems (React, TypeScript).
 * Codebase Scaling & Refactoring: Proven track record leading large-scale architectural refactors, resolving performance bottlenecks, and maintaining high reliability across complex domain models.
 * AI Tooling & Automation Fluency: Hands-on experience applying emerging AI tools or frameworks to streamline software development, refine testing suites, or deliver AI-powered product capabilities.
 * System Ownership & Impact: Track record of owning multi-quarter engineering roadmaps that solve hard infrastructure/business challenges and deliver measurable customer value.
 * Technical Mentorship: Demonstrated ability to mentor and elevate junior and senior engineers, driving technical excellence across teams., * Deep domain expertise in fintech, payroll processing, benefits administration, tax compliance, or HR tech.
 * Hands-on experience scaling large monolithic architectures into domain-oriented modular services.
 * Experience experimenting with and safely deploying generative AI frameworks in enterprise production environments.

## Description

* Core Product Architecture: Design, build, test, and maintain features across Gusto's core product suite, including Payroll, Health Benefits, HR, Retirement, Gusto Money, and Gusto Pro.
 * Large-Scale Platform Evolution: Help scale, refactor, and maintain one of the world's largest production Ruby on Rails and JavaScript/React codebases for high availability and low latency.
 * AI-Accelerated Engineering: Leverage state-of-the-art AI tools and agentic frameworks to accelerate feature development, enhance test coverage, optimize system refactoring, and share best practices across engineering pods.
 * Multi-Quarter Technical Leadership: Own ambiguous, multi-quarter technical initiatives from initial concept through technical spec, rollout, and long-term monitoring, solving complex scalability challenges.
 * Cross-Functional Collaboration: Partner directly with Product Management, Data Science, Design, and Platform Engineering teams to prototype, iterate, and ship high-impact features daily.
 * Mentorship & Technical Guidance: Mentor engineers across teams to solve complex technical problems, raise engineering quality standards, and maximize career development.