VOIP and Infrastructure Engineer - Milton Keynes Network Support, Linux, Windows. Cloud, Telecoms, Firewalls Onsite role A growing technology company is seeking a Senior IT Systems Engineer to join its Infrastructure and Security team at its Milton Keynes HQ. This is a new, hands-on role focused on maintaining and improving corporate and production IT systems, both on-premise and in the cloud. The RoleYou will play a key role in ensuring system availability, improving operational resilience, and supporting critical infrastructure. You''ll work across Linux and Windows environments, manage cloud platforms, implement cyber security measures, and contribute to the ongoing optimisation and documentation of IT systems. This is an excellent opportunity to take ownership of infrastructure that supports high-availability, security-critical services. Key Responsibilities Provision and support IT infrastructure and systemsAdminister Linux and Windows operating systemsManage cloud platforms (Azure, AWS, Google Cloud, Microsoft 365)Implement cyber security controls, including firewalls, WAFs, Active Directory, IPS/IDSSupport network administration (IP networking, routing, VLANs, Spanning Tree, VoIP)Manage database administration, backups, patching, and upgradesSupport high availability and secure production environmentsProduce and maintain technical documentation and operational procedures Skills and Experience Several years'' experience in IT systems engineering or infrastructure ro