Senior Systems Engineering

energy is building the power infrastructure that makes the AI era possible. As AI demand surges past what the grid and traditional data centers can support, ON.energy provides a new class of power technology proven at gigawatt scale and trusted by the world’s leading cloud and AI companies. S. national labs, and certified for grid-safe operation by major utilities. With real products in the field, we’re scaling faster than the grid can, transforming power from a bottleneck into a competitive advantage for the companies building the future.

The Senior RHEL engineer will own the OS and container platform behind our on-premises energy-management deployments. You’ll build and harden the tailored RHEL image and the containerized Ignition SCADA workload running on industrial PCs across U.S. data-center sites, and act as our deep RHEL authority and L3 escalation point. This is a platform-engineering and expertise role — not field installation.

You will own our OS architectures, container builds and configuration, and the runtime that hosts Ignition, while the SCADA team owns everything configured inside Ignition (tags, screens, logic). On the network side, the host firewall and OS-level networking (interfaces, routing, DNS, firewalld/nftables) are yours, while the physical and site network beyond the host NIC belongs to Operational Technology (OT). Travel to third-party data-center sites is for troubleshooting and support only. The separate OT team commissions and deploys every machine, so you won’t install systems in the field.

Containerfile, base image, JVM, persistence, ports, hardening, scanning, and registry.

Harden the OS and images to a recognized baseline (CIS/STIG) and define a patching and lifecycle strategy for OT uptime and restricted/disconnected sites (offline/mirrored registry).

Troubleshoot full-stack — OS, container runtime, and application runtime behavior — remotely and on-site, handing off application-level issues to the SCADA team.

Own host-level networking and firewall configuration (interfaces, routing, DNS, firewalld/nftables, and port exposure for the SCADA container), and lead connectivity troubleshooting between the host and site infrastructure.

Document runbooks for the OT team and help define the connectivity and security posture.

Maintain the Windows image pipeline (Packer-based) in steady state once established: periodic patching, hardening updates, and image rebuilds.

7+ years of senior, hands-on production RHEL/Linux engineering.

Podman, quadlets/systemd, building and owning container images (including packaging a JVM-based app such as Ignition), and registry management.

Reproducible, turnkey, versioned RHEL image building (bootc, Kickstart, Image Builder/osbuild, or Ansible-driven).

Patch and lifecycle management for restricted/disconnected environments, including offline/mirrored content and registries.

Strong Linux networking and diagnostics: firewall administration (firewalld/nftables) and packet/connectivity tooling (Wireshark, tcpdump, ss, ip), plus containerized debug environments (toolbox).

Windows image automation (Packer) and Windows patching/hardening familiarity.

Available to travel to sites for on-site support (20%), and to provide remote support for production issues.

Able to meet third-party data-center access requirements (background check, badging, host-facility protocols) and represent the company professionally on-site.

Competitive salary + annual performance-based bonus eligibility

Medical, dental, and vision insurance

Paid time off and company holidays

Competitive salary + annual performance bonus eligibility

Major medical expenses and life insurance

Paid time off and holidays (per local policy)

Professional development and growth opportunities

Opportunity to grow with a mission-driven team shaping the future of clean energy

Equal Opportunity: ON.energy is committed to equal employment opportunity and to maintaining a work environment free of harassment, discrimination, or retaliation.

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