NREL is seeking a mid-career Network & Systems Engineer to join its Cybersecurity Research Center (CRC). The CRC conducts applied research at the intersection of cybersecurity, energy systems, national resilience, and data-centric research infrastructure-developing the tools, architectures, methods, and scientific foundations required to secure and sustain the nation's evolving energy infrastructure. CRC research and experimentation spans secure network and system architecture, adversarial and defensive cybersecurity experimentation, operational technology (OT) and industrial control systems (ICS), network and system modeling, database and data workflow management, hardware/software assurance, and cyber-physical resilience testing. Working across NREL's energy, grid, and systems integration missions, the CRC leverages unique laboratory assets-including the ARIES Cyber Range-to build, operate, and evaluate large-scale, high-fidelity cyber-physical research environments. We are seeking a technically strong and research-focused systems professional who can design, build, and manage secure research infrastructures while enabling controlled adversarial experimentation, threat emulation, and cybersecurity evaluation. The successful candidate will bring depth in one or more areas such as network engineering, systems administration, programming/automation, database management, cybersecurity, data center operations, or systems architecture. This individual will collaborate with researchers conducting adversarial experiments and will help translate research requirements into reproducible, secure, and high-performance computing environments.