Systems Infrastructure Engineer

The Systems Infrastructure Engineer manages Entanet’s on-premise and hybrid cloud infrastructure through and beyond separation from CityFibre. The role owns hardware, OS-level administration of the Linux estate and virtualisation platforms, supports lifecycle management of the estate, including migration to AWS or other cloud environment. This is a hands-on role, and they will work closely with the team of Networks Architects and Engineers on shared systems such as RADIUS, DNS, NMS, and logging., * Manage on-premise server and storage infrastructure hosted across two data centres in London and Wolverhampton, including OpenStack and Proxmox virtualisation environments, together with associated storage and backup/recovery systems (e.g. Veeam, Bacula or Restic).

• Manage cloud (AWS) environments, including provisioning via infrastructure-as-code (e.g. Terraform or CloudFormation).
• Support configuration and migration from CityFibre systems, including replacement systems such as a Network Monitoring System (e.g. Zabbix, LibreNMS or Observium), NetBox (IPAM/DCIM), centralised logging (e.g. rsyslog, Graylog or the ELK stack), DNS (e.g. BIND or PowerDNS) and an ITSM platform (e.g. ServiceNow or Jira Service Management).
• Own Linux/OS administration (e.g. RHEL/Rocky Linux, Ubuntu/Debian), patching, virtualisation and automated server provisioning.
• Collaborate with Networks on network-related systems and integration (NMS, DNS, FreeRADIUS, TACACS+/AAA, logging).
• Support the Cloud/AWS Engineer on migrations requiring data extraction from on-prem systems.
• Support the rebuild of services that fall out of scope (e.g. DNS) where required.
• Maintain configuration compliance and a reliable patching cadence across the estate using configuration-management and automation tooling (e.g. Ansible or Puppet).
• Use approved AI-assisted tooling (Copilot, Claude, etc) to automate patching workflows, configuration compliance checks and migration data validation, reducing manual effort and the risk of human error.
• This role will require suitable on-call rota, including out of hours for remote troubleshooting and maintenance activities.

• Strong Linux/OS administration experience (e.g. RHEL/Rocky Linux, Ubuntu/Debian) in a production environment.
• Experience with virtualisation platforms (OpenStack, Proxmox or equivalent).
• Understanding of on-premise to cloud migration, including data extraction.
• Familiarity with network-adjacent systems such as FreeRADIUS/TACACS+ (AAA), DNS (BIND/PowerDNS) and centralised logging (rsyslog/Graylog).
• Build and configure systems “secure by design”, with particular focus on compliances with the Telecoms Security Act, NCSC guidelines and NIST frameworks.
• Strong scripting (e.g. Bash, Python) and automation ability (e.g. Ansible, Terraform).
• Methodical approach to patching, compliance and change.
• Collaborative - able to work across infrastructure and network boundaries.
• Comfortable using AI-assisted tooling to accelerate deployment, reduce manual and error-prone tasks.

It would be great if you have any of the following, but it’s not essential:

• Hands-on AWS experience to support migration workstreams.
• Experience standing up or rebuilding DNS and core services.
• Exposure to ISP core systems, such as TACACS+, DHCP, DNS, NTP, RADIUS, NMS, SYSLOG, Netbox.
• Previous involvement in a TSA or carve-out network/system/server migration.
• Experience working within ITIL framework., * Degree in a relevant field or equivalent experience.
• Relevant certification (e.g. Linux, AWS, or virtualisation) desirable.
• Right to work in the UK.

• Competitive base salary.
• Generous holiday allowance and flexible working arrangements.
• Supportive, inclusive culture with and cross-functional collaboration.

Please submit your CV and if you wish, a brief covering note outlining your relevant experience and why you are interested in this role. We will review applications on a rolling basis and contact shortlisted candidates to arrange interviews.

We are committed to equality of opportunity and welcome applications from candidates of all backgrounds. If you require any reasonable adjustments during the recruitment process, please let us know.