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 Five9's 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 You'll 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: 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.