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Sr Software Engineer - UI

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. &

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Five9 Source published Sep 20, 2026 Verified 1 hour ago
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Overview

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. &

Full job description

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.  Role Overview     We're looking for a talented Frontend Engineer who leads with UI but isn't afraid to go deep. You thrive in a fast moving environment, ship polished interfaces with TypeScript and React and embrace AI-assisted development as a core part of your workflow. This role is front-end-first, but the expectation is that you'll grow into full stack ownership over time.   How You Contribute   Design and build responsive, performant UIs using  React, TanStack, Zustand,   TypeScript and/or JavaScript   Collaborate on feature development end-to-end, gradually taking on backend work as you grow   Use  GitLab  for version control, CI/CD pipelines, merge request workflows, and issue tracking   Deploy and manage workloads on  Google Cloud Platform CDN , working alongside with services like GKE, and Cloud Storage   Leverage  AI-assisted (vibe coding)  tools to accelerate development — you're comfortable using Copilot, Cursor, Claude, or similar tools as a force multiplier   Write clean, maintainable code with strong typing and component reuse in mind   Partner closely with designers and product to translate specs into real, shippable experiences   Participate in code reviews, retrospectives, and architectural discussions     Required Skills and Qualifications     5+ years of + post-internship experience with React and TypeScript.   Solid JavaScript/ TypeScript, HTML, CSS    Knowledge of UI Component Libraries, Web Accessibility, Internationalization    Ability to work with test libraries (Jest, Playwright)    Proficient in React, TanStack, Zustand    Engineering focus    Overall system knowledge     Working knowledge of Jira, GitLab, Visual Studio, CI/CD    Proficient in Google Cloud Platform, Kubernetes, BigQuery, Cloud SQL, CDN    Ability to use Claude Code   Desirable Qualifications   AI Tools   Micro Front End Architecture   Java/ Springboot   Database SQL/ NoSQL   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.    This role is hybrid and requires 3 days a week in office .   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.

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