Staff Software Engineer - Frontend | Digital

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide.

Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.

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The Opportunity

As a Staff Software Engineer on the Digital Team, you will design, develop, and maintain frontend software solutions supporting Five9’s digital initiatives. This role focuses on building scalable, reliable, and high-performance frontend applications.

Our dedicated team is committed to optimizing user experiences, streamlining workflows, and enhancing productivity across the board. Whether empowering agents with intuitive interfaces, equipping supervisors with powerful management tools, or enabling seamless access to critical applications across multiple platforms, we strive to deliver with efficiency and customer satisfaction.

You will be responsible for developing, maintaining, and advancing applications and component libraries across Five9. Responsibilities include software design and development, testing, and documentation across our React component library and applications. A passion for developing consistent, high-quality, and performant user interfaces is essential.

The role also involves deep technical exploration of emerging technologies and partnering with product teams to bring innovative ideas into production. In addition, this position plays a key role in mentoring engineers and driving frontend engineering best practices across Five9.

What You’ll Do

• Build reusable, responsive, and WCAG-accessible components for our design system and web applications while translating Figma designs into production-ready component code aligned with design specifications
• Maintain and organize the design token system, bootloader, and codemods in collaboration with other frontend developers and the design team
• Continuously improve our React component library by adopting modern frontend packages, patterns, and engineering best practices
• Ensure seamless deployment by implementing CI/CD workflows, unit tests, integration tests, and visual regression testing, while publishing and communicating component library enhancements
• Collaborate closely with cross-functional teams including design teams, product managers, UI architects, and frontend developers to build new capabilities and improve existing experiences
• Advocate and establish standards, best practices, and engineering guidelines that ensure high-quality, scalable, and maintainable code
• Drive architectural discussions and influence technical direction across frontend initiatives
• Provide technical guidance and mentorship to engineers through code reviews, strategic planning, design discussions, and knowledge sharing
• Stay current with evolving technologies and help evaluate and adopt tools that strengthen our frontend ecosystem

What You Bring

• Strong debugging and problem-solving skills with the ability to investigate and resolve complex application issues
• 7–10 years of frontend development experience with modern web technologies
• Strong expertise in React and TypeScript
• Strong proficiency in semantic HTML, CSS (preferably SCSS), and JavaScript
• Experience building and maintaining component libraries, design systems, and design tokens
• Strong expertise in Web Content Accessibility Guidelines (WCAG)
• Experience with frontend tooling and migration frameworks (preferably Vite and Codemods)
• Experience with testing frameworks such as React Testing Library, Cypress, Enzyme, and Chromatic
• Experience working closely with design teams using Figma
• Strong understanding of frontend architecture, application performance optimization, and scalable UI patterns
• Understanding of product architecture and modern frontend applicatio…