Sr AI Software Engineer

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.

About the Role

We are looking for a Senior Frontend Engineer to join the AI team at Five9 building tools that enable 3rd-party Contact Center and call recording platform customers to integrate with Five9s AI capabilities.

You will own the frontend of a standalone AI application used by enterprise customers and sales teams working closely with product AI and backend engineering to deliver fast reliable and intuitive experiences in a real-time contact center environment.

What Youll Do

• Build and maintain the AI Standalone frontend application including data ingestion mapping and transformation workflows

• Develop real-time UI features using WebSocket and streaming protocols for live agent and supervisor experiences

• Design and deliver desktop applications (Electron or equivalent) alongside web-based interfaces where the use case demands it

• Design intuitive interfaces for non-technical operations and sales users working with contact center data

• Implement scalable frontend architectures including Microfrontend patterns for modular multi-team codebases

• Collaborate with backend and AI platform teams on integration patterns for real-time data and AI-driven features

• Build and maintain CI/CD pipelines automated test validation and code quality checks to support fast delivery

• Instrument applications with observability and session tooling (Sentry LogRocket New Relic or equivalent)

• Lead and mentor engineers within the team and contribute to frontend engineering standards and practices

• Support expanding integrations across multiple 3rd-party CCaaS platforms and enterprise customers

What You Bring

• 4 years of hands-on frontend engineering experience shipping production applications at scale

• Proficiency in modern JavaScript/TypeScript and React (primary stack)

• Proven experience building real-time applications using WebSocket or SSE - live dashboards agent assist overlays streaming transcripts or similar

• Experience building or maintaining Electron-based desktop applications including packaging auto-update and cross-platform distribution

• Understanding of Contact Center domain concepts: call flows agent states dispositions queue management recordings and CCaaS platforms (Genesys NICE Avaya Amazon Connect or similar)

• Working knowledge of Agent Assist or AI Agents platform development - building or consuming AI-driven features such as copilots real-time transcription or supervisor monitoring in a contact center context

• Experience with Microfrontend architecture (Webpack Module Federation or equivalent) for large multi-team applications

• Hands-on with CI/CD tooling (Jenkins Harness or similar) and automating build validation and deployment pipelines

• Ability to design clean usable interfaces for enterprise operational users

• Experience with cloud deployment to S3 or CDN-backed infrastructure

Nice to Have

• Background in speech analytics conversation intelligence or post-call QA platforms

• Experience with HLS or other media streaming protocols in a browser or desktop context

• Prior work on multi-tenant SaaS products serving multiple enterprise customers

• Hands-on with observability and analytics tooling: LogRocket Sentry New Relic Mixpanel or Loggly

• Experience with browser-based file processing: CSV parsing client-side data transformation and download workflows

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: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.