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Sr Software Engineer

Five9 at a glance

five9.com
  • Founded 2001
  • Ticker FIVN
FIVN 24.66 USD +6.13%
  • Revenue (FY2025) $1.15B
  • Net income $39.42M

Investor research: Yahoo Finance · SEC filings

Five9

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.


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.

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.

To apply for this job please visit www.five9.com.

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India, officially the Republic of India, is a country in South Asia. It is the seventh-largest country by area, the most populous country in the world and, since its independence in 1947, the world's most populous democracy. Bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast, it shares land borders with Pakistan to the west; China, Nepal and Bhutan to the north; Bangladesh and Myanmar to the east. In the Indian Ocean, India is near Sri Lanka and the Maldives. Its Andaman and Nicobar Islands share a maritime border with Myanmar, Th

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