ON.energy is setting the standard for large load interconnection. ON’s patented AI UPS™ is a medium-voltage UPS that serves as a firewall, protecting the data center from the grid, and the grid from the data center. With multiple gigawatts currently under construction, we are enabling grid-safe data centers.

ROLE SUMMARY

We're looking for A Senior RHEL Infrastructure QA Engineer to validate the reliability, performance, and deployment integrity of our server and application infrastructure, including systems running on Red Hat Enterprise Linux (RHEL) and containerized workloads. This role sits at the intersection of QA and systems/infrastructure engineering — testing not just application behavior, but the platforms and deployment pipelines that behavior runs on, including performance under load, correct behavior across upgrades, and validation of containerized and orchestrated deployments.

KEY RESPONSIBILITIES

Design and execute test plans for infrastructure changes, including OS-level updates, container deployments, and platform upgrades.
Validate server sizing and performance under load, including load, stress, and soak testing of production-bound systems.
Test and verify containerized application deployments for correctness, resource behavior, and rollback safety.
Build and maintain test automation and monitoring scripts to validate infrastructure health and deployment outcomes.
Collaborate with systems, DevOps, and application engineering teams to define acceptance criteria for infrastructure changes.
Document test results, defects, and qualification outcomes clearly for technical and non-technical stakeholders.

KEY REQUIREMENTS

5+ Years of hands-on Linux administration experience, specifically with Red Hat Enterprise Linux (RHEL) — system administration, package management, service management (systemd), and shell scripting.
Experience testing or validating containerized deployments — building, running, and troubleshooting Docker containers, and working knowledge of container orchestration fundamentals (Kubernetes or OpenShift).
Solid QA/testing background — designing test plans and test cases, executing structured test cycles, and tracking/triaging defects to resolution.
Experience with CI/CD pipelines and validating automated build/deployment processes (e.g. Jenkins, GitLab CI, Azure DevOps, or similar).
Working knowledge of networking fundamentals (TCP/IP, DNS, firewalls, VPN concepts) sufficient to test connectivity, access, and security requirements.
Scripting ability in Bash and/or Python, for building test harnesses and automating repetitive validation tasks.
Experience with performance/load testing tools and methodology (e.g. JMeter, Locust, k6, or comparable).
Familiarity with version control (Git) and issue tracking systems (e.g. Jira, Azure).
Strong troubleshooting and root-cause analysis skills spanning OS, network, and application layers.
Clear written communication — able to produce test plans, test cases, and defect/qualification reports that non-specialists can follow.

PREFERRED EXPERIENCE

Experience testing industrial/OT systems or SCADA platforms (e.g. Ignition, PLCs, MQTT/OPC UA) — directly relevant to our environment.
Deeper Kubernetes/OpenShift operational experience — cluster administration, Helm charts, or similar.
Exposure to infrastructure-as-code tooling (Ansible, Terraform).
RHEL certification
Experience with monitoring/observability tooling (Prometheus, Grafana, Nagios, Zabbix, or similar).
Security testing awareness — vulnerability scanning, hardening validation, or familiarity with CIS benchmarks for RHEL.
Experience with virtualization platforms (VMware, KVM).
Prior experience in energy, utilities, or other critical-infrastructure/industrial sectors.
Experience with cloud platforms (Azure, AWS), especially hybrid on-prem/cloud environments.
Familiarity with database testing (PostgreSQL, MySQL, or similar).
Experience with load balancers or reverse proxies (HAProxy, NGINX).

Senior RHEL QA Infrastructure Engineer

Note: This position may include 20% annual business travel