Senior Systems Administrator

Your Job Join Flint Hills Resources as a Senior Systems Administrator, responsible for the full lifecycle of IT infrastructure that supports critical systems. In this dynamic role, you will manage a diverse technology landscape spanning on-premises data centers, cloud platforms, and hybrid environments. You will take ownership of key applications and services within our IT environment, driving their deployment, configuration, monitoring, and ongoing optimization to ensure uninterrupted, secure, and high-performance operation in a 24x7x365 mission-critical setting. This role will work a hybrid schedule and can be based in our Wichita, KS headquarters or our Rosemount, MN refinery. Our Team Flint Hills Resources offers a rare environment where you'll work across the full technology spectrum. You will partner with plant operations, cybersecurity, and IT engineering to support and modernize a broad technology stack-from legacy on premises systems to cloud native services, containerization, virtualization, and enterprise storage-balancing uptime and safety with innovation. You'll advance our zero trust approach, drive infrastructure modernization for compliance and observability, and help shape the technology roadmap that strengthens Flint Hills Resources' long term resilience. What You Will Do

Infrastructure Troubleshooting:

Lead troubleshooting and resolution of complex technical issues across Windows/Linux servers, storage, virtualization, and cloud components

Performance Monitoring & Capacity Planning:

Monitor and optimize system performance with tools like PRTG and Tanium; establish baselines and perform capacity planning for growth and resilience

Incident Response & Uptime Protection:

Manage incident response processes to protect system availability and integrity

Documentation & Compliance:

Maintain detailed documentation of system/network configurations, processes, and architecture to ensure transparency and compliance

Enterprise Storage Management:

Support and maintain enterprise storage systems (e.g., Nimble Storage arrays) to ensure efficient, secure data accessibility

• Identity & Access Management (Active Directory): Manage Active Directory for user/group administration, authentication, and access control to support secure operations
• Cloud Infrastructure Management (AWS): Oversee AWS-based infrastructure to extend and integrate cloud resources with on-premises systems
• Containerization & Orchestration (Kubernetes): Deploy and manage containerized applications with Kubernetes to improve scalability and reliability

Cross-functional Collaboration & Support:

Work with cross-functional teams, vendors, and customers to provide on-site and remote infrastructure support

Strategic Multi-Disciplinary Projects:

Participate in strategic projects that span technologies, business units, and stakeholders Who You Are (Basic Qualifications)

• 5+ years of experience in a system.

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