Sr. RHEL Systems Engineer, OT/SCADA
HybridHouston, Texas, United States
Job Summary
Build and maintain a reproducible, turnkey RHEL image tailored for SCADA hosts, including time sync, firewall rules, storage, and resource tuning. Own the end-to-end SCADA container image lifecycle, managing Containerfiles, base images, JVM persistence, hardening, and registry operations. Run containers as systemd services via Podman and quadlets while hardening OS and images to CIS/STIG baselines. Troubleshoot full-stack issues remotely or on-site, handling host-level networking, routing, DNS, and firewalld/nftables configuration. Document runbooks for the OT team and define connectivity security posture for restricted, offline environments. Available for 20% travel to third-party data-center sites for support, with a hybrid schedule based in Houston, Miami, or Reston VA.
Required Qualifications
- 7+ years of senior, hands-on production RHEL/Linux engineering
- Container-native delivery: 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)
- OS and image hardening to a recognized baseline (CIS/STIG)
- Patch and lifecycle management for restricted/disconnected environments, including offline/mirrored content and registries
- Automation (Ansible) and version control
- Strong Linux networking and diagnostics: firewall administration (firewalld/nftables) and packet/connectivity tooling (Wireshark, tcpdump, ss, ip), plus containerized debug environments (toolbox)
- Confidence operating as the RHEL authority, with strong documentation habits
- 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
- Based in the Houston, TX area preferred for hybrid schedule environment
Desired Qualifications
- OT/ICS or SCADA exposure and frameworks (IEC 62443, NERC CIP, NIST 800-82)
- Familiarity with Ignition specifically
- Windows image automation (Packer) and Windows patching/hardening familiarity
- RHCSA / RHCE / RHCA certifications
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