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.
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 DoBuild 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
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
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 Required
- 4+ years of hands-on frontend engineering experience shipping production applications at scale
- Proficiency in modern JavaScript and TypeScript
- Proficiency in React
- Proven experience building real-time applications using WebSocket or SSE
- Experience building or maintaining Electron-based desktop applications, including packaging and auto-update
- Understanding of contact center domain concepts and CCaaS platforms (Genesys, NICE, Avaya, Amazon Connect)
- Working knowledge of Agent Assist or AI Agents platform development (real-time transcription, copilots, supervisor monitoring)
- Experience with Microfrontend architecture (Webpack Module Federation or equivalent)
- Hands-on with CI/CD tooling (Jenkins, Harness, or similar) and automating build validation and deployment pipelines
- Experience with cloud deployment to S3 or CDN-backed infrastructure
- Instrumenting applications with observability and session tooling (Sentry, LogRocket, New Relic, or equivalent)
- Ability to design clean, usable interfaces for enterprise operational users
Five9 Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Five9 and has not been reviewed or approved by Five9.
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Healthcare Strength — Employer-paid employee premiums, multiple plan options, and broad coverage across medical, dental, vision, disability, FSAs, and EAP are emphasized as core elements of the package. These features position healthcare as a standout component of total rewards.
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Equity Value & Accessibility — Equity grants and an ESPP are highlighted as meaningful parts of total compensation. Feedback suggests these stock components can materially enhance overall pay when company performance is favorable.
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Fair & Transparent Compensation — Public job postings include salary ranges and company materials describe formal peer benchmarking of pay. These practices indicate structure and visibility around compensation decisions.
Five9 Insights
What We Do
Five9 is an industry-leading provider of cloud contact center solutions, bringing the power of cloud innovation to more than 2,000 customers worldwide and facilitating billions of customer engagements annually. The Five9 Intelligent Cloud Contact Center provides digital engagement, analytics, workflow automation, workforce optimization, and practical AI to help customers reimagine their customer experience. Designed to be reliable, secure, compliant, and scalable, the Five9 platform helps increase agent and supervisor productivity, connects the contact center to the business, and ultimately deliver tangible business results including increased revenue and enhanced customer trust and loyalty
