About the role

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.

Skills & Tags

react java typescript javascript go ai frontend backend

Aplyr's read

Five9 excels in cloud contact center solutions, attracting tech-savvy professionals keen on enhancing customer communication through innovative software.
Synthesized from recent postings & public sources

What's promising

•Five9's cloud-based platform is crucial for businesses seeking flexible and scalable customer service solutions.
•The company is investing heavily in AI and automation, indicating a forward-thinking approach.
•Recent hires suggest robust growth and a diverse range of career opportunities across global locations.

What to watch

•Competition in the cloud contact center market is intense, with major players like Amazon and Microsoft.
•Rapid technological changes require constant adaptation, potentially straining resources.
•Limited public information about employee satisfaction and company culture could concern potential applicants.

Why Five9

•Five9 specializes in cloud contact center software, setting it apart from broader cloud service providers.
•The focus on AI-driven customer experience solutions highlights its commitment to innovation.
•A diverse range of roles in engineering and management reflects a comprehensive approach to talent acquisition.

Aplyr’s read is generated by AI from public sources. Was it useful?

About Five9

Five9

five9.com

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Five9 is a leading provider of cloud contact center software, enabling businesses to deliver exceptional customer service and support through a variety of communication channels.