Sr AI Software Engineer

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.

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

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

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

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

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

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

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

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

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

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

• 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

• 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