Senior Systems Administrator

Compensation: $115,000 - $150,000 / year

Department: General & Admin

Location: Boulder, CO

Flatirons Solutions is seeking a highly skilled Senior Systems Administrator with advanced expertise supporting Defense workloads and operating within highly compliant, security-driven environments. This is a critical role within our organization, responsible for taking primary ownership of infrastructure in a CMMC Level 2 certified environment designed to securely host Controlled Unclassified Information (CUI). If you thrive in secure, compliance-focused environments and bring deep experience in defense, CMMC, FedRAMP, or similar regulatory frameworks, we want to hear from you.

In this role, you will play a vital part in managing and maintaining our customer-facing IT infrastructure. You will oversee the design, implementation, optimization, and security of systems to ensure reliability, performance, and compliance.

This role requires a proactive, security-first mindset and the initiative to drive continuous improvement across infrastructure, processes, and compliance controls.

• Assist with design of long‑term strategic vision for the IT environments.
• Participate in product evaluations given by vendors for potential implementation.
• Participate and provide expert guidance/response for all audits such as ISO
  27001, ISO
  9001, ISO 27701, CMMC, NIST etc.
• Advise management on hosting budget for all infrastructure-related expenditures.
• Design, deploy, and maintain the company's hosting IT infrastructure, including servers, networks, storage, and virtualization environments.
• Manage and monitor system performance, capacity, and availability to ensure optimal performance and uptime.
• Implement and enforce security best practices to protect company and/or customer data and systems from potential threats and vulnerabilities.
• Troubleshoot and resolve technical issues related to servers, networks, and applications in a timely manner.
• Collaborate with other IT teams and departments to support business initiatives and projects.
• Plan and execute system upgrades, patches, and migrations with minimal disruption to operations.
• Design backup strategies for all systems.
• Develop and maintain documentation, standard operating procedures, and policies related to system administration.
• Mentor and provide oversight to other system administrators, sharing knowledge and best practices.
• Serve as a point of escalation for other systems administrators.
• Perform planning, configuration, deployment, and maintenance‑work associated with the Flatirons Solutions production and development hosting environments.
• Perform systems administration tasks associated with implementation, migration and deployments utilizing remote hands.
• Quickly and efficiently troubleshoot simple and complex issues to provide outstanding support for customer and internal needs.
• Identify areas for process and efficiency improvement within systems operations; recommend solutions and assist in overseeing implementation.
• Actively facilitate continuous improvement with a focus towards efficiency, value, and improved stability, security and privacy.
• Ensure all necessary operational processes and procedures are carried out with a high level of attention to detail, expediency and on‑time delivery.
• Create and maintain system information diagrams and detailed documentation.
• Monitor various systems capacity and provide analytics & forecasts for added or reduced capacity as required.
• Use strong communication skills (both written and verbal) to direct with precision and clarity remote‑hands technicians over the phone to execute deployment, break‑fix, and upgrade plans accurately.
• Understands and adheres to all requirements of the Integrated Management Systems (IMS), which includes Quality, Information Security, and Privacy.
• Other duties as may be assigned.

• Proficiency in virtualization technologies such as VMware or Hyper‑V.
• Strong understanding of networking principles and protocols (TCP/IP, DNS, DHCP, VLANs, etc.)
• Experience with cloud platforms such as AWS and Azure.
• Familiarity with configuration management tools (e.g., Puppet, Chef, Ansible).
• Excellent problem‑solving skills and the ability to troubleshoot complex technical issues.
• Solid communication and interpersonal skills, with the ability to work effectively in a team environment.
• Industry certifications such as MCSE, RHCE, CCNA, or AWS Certified Sys Ops Administrator preferred.
• Experience with containerization technologies (Docker, Kubernetes) is a plus.
• Knowledge of scripting languages (Power Shell, Bash, Python) for automation is a plus.
• Experience with cybersecurity practices and tools preferred.

Preferred location is the Denver/Boulder area.