Sr Infrastructure 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. 

We are seeking a highly experienced Cloud Infrastructure Engineer to implement and support our community-driven OpenStack-based private cloud infrastructure. You will be directly responsible for ensuring the scalability, resilience, automation, and performance optimization of our cloud environment by leveraging Infrastructure-as-Code (IaC) tools like Ansible and Terraform.

This is a deeply technical role requiring expert-level understanding of Ubuntu KVM internals, OpenStack internals, and Kubernetes. You will also collaborate with platform and SRE teams to maintain secure, performant, and multi-tenant-isolated services that serve high-throughput, mission-critical applications.

*This position is based out of one of the offices of our affiliate Acqueon Technologies in India, and will adopt the hybrid work arrangements of that location. You will be a member of the Acqueon team with responsibilities supporting Five9 products, collaborating with global teammates based primarily in the United States.

• Implement and support multi-tenant OpenStack infrastructure with Ubuntu KVM supporting multi-region virtual infrastructure deployments.

• Implement and support multi-tenant Kubernetes clusters leveraging BareMetal servers and software-defined storage protocols.

• Automate the provisioning, lifecycle management, and configuration of Ubuntu KVM, Cisco UCS servers, Pure Storage for block and file, Ceph for software-defined storage, and supporting components using Ansible, Terraform, or Pulumi.

• Implement continuous delivery pipelines for infrastructure updates, including patch management, service upgrade testing, and rollback procedures.

• Develop automated monitoring, alerting, and healing mechanisms using GitOps principles and observability stacks (e.g., Prometheus, Loki, Grafana).

• Harden services for high availability, disaster recovery, and scale-out operations.

• Perform deep-dive troubleshooting and performance analysis of infrastructure services across hypervisors, backend storage protocols, and networking layers.

• Participate in on-call rotation, incident response, and root cause analysis for platform reliability issues.

• 5+ years of experience operating and automating large-scale OpenStack cloud environments with Ubuntu KVM hypervisors and Kubernetes, preferably in community-driven or upstream-contributing teams.

• Proficiency in Infrastructure-as-Code with Ansible, Terraform, or Pulumi.

• Strong hands-on knowledge of Cisco UCS Blade Servers (or similar server infrastructure), block/file storage (software-defined storage preferred).

• Strong Linux (RHEL/CentOS/Ubuntu) systems engineering background with advanced scripting in Python, Bash, or Go.

• Fluency with Git, CI/CD pipelines, and automated test frameworks.

• Strong understanding of hypervisor technologies (KVM, vSphere), storage protocols (iSCSI, NFS, CEPH), and L2/L3 networking.

• Demonstrated success building or maintaining multi-region or high-availability OpenStack clusters.

• Ability to write technical documentation and contribute to community wikis or knowledge bases.

• Contributions to upstream Ubuntu codebases or participation in SIGs/WGs.

• Understanding of security best practices for Ubuntu OS patching and security compliance (e.g., CIS, NIST).

• Background in telco, edge cloud, or large enterprise infrastructure environments.

• Experience building and maintaining automated test environments for Ubuntu upgrades and validation.

• Bachelor's degree in Computer Science, IT, Engineering, or a related field preferred; equivalent experience and relevant industry certifications will also be considered.

• A collaborative team that's deeply invested in open source, community contribution, and infrastructure excellence.

• Complex technical challenges that require creative, scalable solutions.

• The opportunity to shape a next-generation private cloud platform built on true open infrastructure principles.

• Access to the latest tools, frameworks, and upstream project developments.

• Analytical Thinking & Problem Solving: Demonstrated ability to translate complex, cross-domain requirements into scalable and resilient cloud infrastructure and automation solutions.

• Collaboration & Teamwork: Strong interpersonal and communication skills with a proven track record of effective collaboration across multidisciplinary teams, including developers, operations, security, and product stakeholders.

• Mentorship & Leadership: Passionate about knowledge-sharing and mentorship, with experience guiding junior engineers and fostering a team culture of continuous learning, innovation, and technical excellence in cloud engineering and DevOps practices.

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. 

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Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.