Sr Software Engineer

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.

Key Responsibilities

• 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

Qualifications & Skills

• 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

Preferred Skills

• AI Tools
• Micro Front End Architecture
• Java/Springboot
• Database SQL/NoSQL

Diversity & Inclusion

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.