Five9 Tech Stack

Cloud contact center and customer experience platform powered by AI

Software Development San Ramon, CA 1,001–5,000 employees Public Company

Five9 operates a unified cloud-native CX platform spanning voice, chat, and omnichannel engagement, now scaling AI-driven automation through adopting Kafka, Redis, and conversational AI services (Google Dialogflow CX, Amazon Lex, IBM Watson). The hiring velocity is accelerating across engineering (92 open roles) and sales (41), with active projects focused on next-generation microservices, agentic quality management, and CDP integration—indicating a shift from legacy premise-based systems toward distributed, AI-elevated cloud infrastructure.

Tech Stack 200 technologies

Core StackNetSuite Salesforce Java Intercom Zendesk Rancher Kubernetes Terraform Helm Prometheus Grafana Loki Ansible Python Go Excel Spring Framework SQL Sprinklr Kustomer Genesys Talkdesk Freshworks Salesforce CPQ DocuSign CLM OpenStack Fleet Argo CD Elasticsearch Fluentd Kibana Bash+170 more

AdoptingNetSuite Kafka Redis RabbitMQ Amazon Kinesis Google Dialogflow CX Amazon Lex IBM Watson+4 more

What Five9 Is Building

◆Challenges

Transitioning legacy premise-based solutions to cloud
Scaling ai platform
Acquiring new customers
Scaling next-generation cloud-native services
Complex sales cycles
Capacity planning
Ensuring compliance with business and legal standards
Customer churn risk
Maintaining data integrity and compliance
Incident response

▲Active Projects

Partner enablement
Developing scalable, highly available global voice platform
Crm integration
Engagement-focused customer data platform (cdp) for acqueon’s customer engagement cloud
Reliability metric improvement
Next-generation ccaas platform
Docusign clm integration for new product launches
Agentic quality management platform
Enhance voice solutions for contact center platform
Next generation microservices platform

Hiring Activity

Accelerating230 roles · 100 in 30d

Department

Engineering

Sales

Support

Finance

Product

Ops

Data

Seniority

Senior

Mid

Director

Junior

Staff

Manager

Principal

Notable leadership hires: Account Director, Sales Director, Mid-Market Account Director

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About Five9

Five9 provides cloud-native contact center and customer experience solutions to mid-market and enterprise companies globally. The platform integrates voice, omnichannel messaging, and workforce management with embedded AI (Five9 Genius) to automate and personalize customer interactions. The company serves 3,000+ customers and works with 1,400+ partners. Five9 is a public company headquartered in San Ramon, CA, with operations spanning the United States, Philippines, Portugal, Canada, India, Germany, Colombia, Australia, and the United Kingdom. Current focus areas include migrating customers off legacy on-premises deployments, scaling the AI platform, improving reliability metrics, and launching new product modules via DocuSign CLM integration.

HeadquartersSan Ramon, CA

Company Size1,001–5,000 employees

Hiring MarketsUnited States, Philippines, Portugal, Canada, India, Germany, Colombia, Australia

Frequently Asked Questions

What tech stack does Five9 use?

Five9 uses Java, Spring Framework, SQL, Kubernetes, Terraform, and Prometheus for core infrastructure; Salesforce and NetSuite for business systems; Elasticsearch Fluentd Kibana for logging; and Argo CD for deployment automation. They're actively adopting Kafka, Redis, and conversational AI services from Google, AWS, and IBM.

What is Five9 working on?

Active projects include building a next-generation cloud-native microservices platform, developing an agentic quality management system, scaling the AI platform, integrating with DocuSign CLM for product launches, building a customer data platform (CDP) for engagement, and enhancing voice solutions for contact centers.