Senior Cloud Platform 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. Sr Cloud Platform Engineer, Cloud Platform About the Role We are building a scalable, cloud-native Email-as-a-Service (EaaS) platform to power automated delivery of alerts, reports, and data notifications across our product suite. You will own the infrastructure layer, defining and automating the full lifecycle of email delivery infrastructure using Terraform/OpenTofu and OpenStack/Rancher. This is a high-ownership role where your work directly enables product reliability at scale. What You Will Do Design, implement, and maintain end-to-end IaC pipelines for the email service using Terraform and OpenTofu, covering provisioning, configuration, and teardown. Deploy and operate email service infrastructure on OpenStack and Rancher-managed Kubernetes clusters. Build and maintain CI/CD pipelines for infrastructure delivery and service rollouts, ensuring zero-downtime deployments. Define and enforce networking, DNS, TLS, and IP reputation configurations required for reliable email delivery (SPF, DKIM, DMARC). Implement observability stacks (metrics, logging, alerting) for email throughput, delivery rates, bounce/spam rates, and queue health. Manage secrets, credentials, and access controls using secrets management tooling and RBAC across environments. Collaborate with backend engineers to define infrastructure contracts and service interfaces. Conduct capacity planning, load testing, and incident response for the email platform. Produce clear IaC documentation, runbooks, and disaster recovery playbooks. What We Are Looking For 6+ years of hands-on D