Senior Systems Administrator
Full time | Hybrid | Arlington, VA
We are supporting a growing technology organisation seeking a Senior Systems Administrator to manage and scale its internal IT and network infrastructure.
This role is hands-on and varied, combining day-to-day IT support with longer-term systems, security, and automation initiatives. You will work closely with internal teams to ensure reliable, secure, and efficient technology operations across the business.
Responsibilities
- Administer Microsoft 365 including user accounts, permissions, licensing, and security configurations
- Provision, image, deploy, and maintain laptops and other hardware across their lifecycle
- Build, maintain, and troubleshoot corporate networks, servers, virtualization platforms, and cloud services
- Monitor alerts and logs, respond to incidents, and maintain backup and recovery processes
- Diagnose system outages, performance issues, and infrastructure bottlenecks
- Manage access provisioning across SaaS platforms and on-prem environments
- Coordinate with third-party vendors for hardware, software, and networking services
- Support IT and DevOps-related projects through to delivery
Requirements
- Proven experience as a Systems Administrator, Network Administrator, or IT Support Specialist
- Strong Microsoft 365 administration experience
- Solid understanding of networking, VPNs, firewalls, and virtualization
- Experience with device imaging and deployment
- Strong troubleshooting and problem-solving skills
- Clear communication skills and a service-focused mindset
- Current CCNA or RHCE certification
- Current IAT II compliant certification
Desirable Experience
- Automation or DevOps tooling such as Ansible, Packer, Python, or Bash
- Linux and Windows server administration
- Security monitoring and incident response
- Familiarity with CMMC and NIST 800-171 compliance frameworks
- Additional certifications such as Security+, Microsoft, AWS, or Azure
