Description:
We are looking for a Systems Administrator to take ownership of core infrastructure and platform operations, with a focus on our on-premise environments. This role is responsible for ensuring systems are stable, secure, and consistently configured, enabling both engineering and security functions to operate effectively.
You will work closely with internal security teams and a co-managed MSP to implement and maintain infrastructure, enforce configuration standards, and ensure security controls are applied effectively. The role includes responsibility for Windows Active Directory domain services, virtualisation platforms, network infrastructure, and supporting systems associated with product development.
Role And Responsibilities
- Maintain and administer core infrastructure across Windows, Linux, and virtualised environments
- Manage and maintain Active Directory, including users, groups, GPOs, and domain services
- Design, implement, and maintain Group Policy Objects (GPOs) to enforce security baselines and configuration standards
- Provision and manage virtual machines using VMware (or similar platforms)
- Configure and maintain network infrastructure, including firewalls (e.g. Cisco) and related services
- Own system configuration, ensuring consistency, stability, and enforcement of defined standards
- Implement and maintain patching processes, leveraging automation where possible
- Manage user accounts, permissions, and access controls, supporting least privilege principles
- Implement and maintain security controls defined by the security team (e.g. logging, hardening, access restrictions)
- Ensure systems generate appropriate logs and telemetry to support monitoring and investigation
- Work with DevSecOps and Security Engineering to support secure configuration of platforms and services
- Support incident response by executing containment and remediation actions (e.g. isolating systems, disabling access)
- Act as the primary interface with the MSP, ensuring work is aligned with internal requirements and standards
- Ensure infrastructure changes are implemented in a controlled and auditable manner
- Identify and resolve configuration drift, reliability issues, and gaps in system management
- Continuously improve automation, tooling, and operational efficiency
Skills & Experience
- Experience working in a systems administration or platform engineering role (typically 2–5 years or equivalent practical experience)
- Strong working knowledge of Windows Server environments and Active Directory (including GPO design and management)
- Experience with virtualisation platforms (e.g. VMware) and VM provisioning
- Strong understanding of networking fundamentals (e.g. DNS, routing, firewalls), including practical experience with network configuration (e.g. Cisco)
- Working knowledge of Linux systems
- Experience managing identity and access (e.g. Active Directory, IAM, or similar)
- Experience implementing patching, system hardening, and baseline configuration
- Ability to script or automate tasks (e.g. PowerShell, Bash, Python)
- Understanding of security fundamentals and system-level risks
- Experience working with or alongside managed service providers is advantageous
- Strong problem-solving ability and attention to detail