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 application design principles
Excellent English communication skills, both verbal and written, with a proactive approach to collaboration
Self-motivated, enthusiastic, and ownership-driven, with a strong commitment to delivering high-quality solutions
Comfortable leveraging agentic coding tools and AI-assisted development environments to enhance productivity and code quality
Bachelor's degree (or equivalent) in a relevant discipline
Nice to Have
Experience with Tokens Studio and Style Dictionary for managing design tokens
Experience with Storybook
Experience with bundlers such as Rollup
Deep understanding of CORS, CDNs, and i18n
Familiarity with Agile methodologies, JIRA, Confluence, and end-to-end testing practices
Exposure to backend technologies and API-driven architectures
Technology & Tools
Languages & Frameworks: React, TypeScript, JavaScript, HTML, CSS/SCSS
Frontend Ecosystem: Storybook, Design Tokens, Vite, Rollup, Codemods
Testing: React Testing Library, Cypress, Enzyme, Chromatic
DevOps & CI/CD: Git, GitLab CI/CD
Design & Collaboration: Figma, JIRA, Confluence
Hardware: Apple MacBook options available
Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.
View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal.
Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Work arrangement
No