Galldris Group
Location: Enfield, Middlesex, EN3 7FJ
An exciting opportunity has arisen for a Senior Infrastructure & Network Systems Engineer to join our Head Office team based in Enfield, Middlesex. The Senior Infrastructure & Network Systems Engineer will design, operate, and secure a modern hybrid IT environment spanning on‑prem, remote office, and cloud platforms. This is a hands‑on, internal ‑based role suited to someone who enjoys working across multiple technologies while maintaining strong security and reliability standards.
Key Responsibilities:
- Design, implement, and support Linux and Windows Server environments (Windows Server 2022+).
- Manage and maintain virtualisation platforms, including Proxmox, ensuring high availability and performance.
- Administer cloud-hosted infrastructure and integrate on-premises systems with cloud-based identity and access management solutions.
- Support and maintain Microsoft 365 and Exchange environments, including both cloud and hybrid deployments.
- Deliver and manage secure web services using IIS and associated technologies.
Storage, Backup & Data Services
- Take ownership of enterprise storage and data services, including TrueNAS environments.
- Manage file services, backup solutions, disaster recovery processes, and business continuity requirements.
- Ensure data integrity, availability, and recovery capabilities are maintained to a high standard.
Identity & Access Management
- Administer authentication, authorisation, and access control solutions across multiple platforms.
- Develop and manage RADIUS policies to support secure network access.
- Oversee Public Key Infrastructure (PKI) and certificate lifecycle management, ensuring secure certificate-based authentication and encryption practices.
- Design, implement, and support secure enterprise networks using Cisco and Ubiquiti technologies.
- Configure and maintain VLAN segmentation, VPN connectivity, M-LAG, and LACP solutions.
- Troubleshoot complex networking issues and optimise network performance across multiple sites.
- Contribute to the development and ongoing enhancement of an in-house Kubernetes platform.
- Support containerised workloads, platform services, storage integration, and certificate management within Kubernetes environments.
- Collaborate with technical teams to improve scalability, automation, and operational efficiency.
Cyber Security
- Champion a security-first approach across all infrastructure and network services.
- Apply Zero Trust and defence-in-depth security principles throughout the IT estate.
- Support ISO 27001-aligned operations and contribute to security hardening, monitoring, vulnerability management, and incident response activities.
Qualifications/ Experience/Knowledge:
- Extensive knowledge of Windows Server infrastructure (2022 and later).
- Experience supporting hybrid cloud and Microsoft technology environments.
- Strong understanding of networking principles and protocols.
- Experience with Cisco and/or Ubiquiti networking technologies.
- Knowledge of authentication, identity management, and PKI solutions.
- Experience managing enterprise backup and disaster recovery solutions.
- Strong troubleshooting and problem-solving skills.
- Excellent documentation and technical communication abilities.
- CompTIA Network+ or equivalent networking qualification.
- Experience with Proxmox virtualisation.
- Knowledge of Kubernetes and containerised environments.
- Experience working within ISO 27001 or other security-focused frameworks.
- Microsoft 365 and Exchange administration experience
Why work for us?
You will be joining a great team with plenty of ongoing support, training and internal development opportunities; a summary of our benefits include:
- 25 days of annual leave plus bank holidays, increasing to 29 days with length of service.
- An extra day of annual leave for your birthday.
- Access to our Salary Sacrifice Car Scheme.
- Access to a range of wellbeing resources.
- Access to private medical insurance.
- Company life assurance.
- Excellent social opportunities with access to Premier League football and The O2 Arena VIP tickets.
Interested applicants must be eligible to work legally in the UK.
Employee referral scheme – refer a friend or family member to work for Galldris.
Galldris is an Equal Opportunities employer and does not discriminate against any protected characteristic.
Please note: We are not using recruitment agencies for this role. In the event of speculative CV submissions, no fees will be applicable.
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