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 & 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 Role You 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 systems Administer Linux and Windows operating systems Manage cloud platforms (Azure, AWS, Google Cloud, Microsoft 365) Implement cyber security controls, including firewalls, WAFs, Active Directory, IPS/IDS Support network administration (IP networking, routing, VLANs, Spanning Tree, VoIP) Manage database administration, backups, patching, and upgrades Support high availability and secure production environments Produce and maintain technical documentation and operational procedures Skills & Experience Several years' experience in IT systems engineering or infrastructure roles Strong Linux and Windows experience Solid networking knowledge Hands-on cloud platform experience Exposure to cyber security tooling and practices Experience managing backups, patching, and system lifecycle processes Strong troubleshooting and problem-solving skills Degree in IT, Engineering, or related discipline (or equivalent experience) Personal Attributes You are self-motivated, proactive, and resilient You enjoy collaborating with others and communicating clearly You have strong attention to detail with a focus on security and reliability You take pride in maintaining stable production environments Why Join? Work on critical infrastructure supporting modern, cloud-based platforms Collaborative, technically driven engineering culture Exposure to modern cloud technologies and complex networking environments Opportunity to contribute to highly available, security-critical systems Stable, established company with a long-standing industry presence Package Competitive salary and benefits (depending on experience) Training and career development opportunities Opportunity to influence processes and work with cutting-edge technology For further details and to apply, please send your CV to jon.brass @ Circlerecruitment.com Network Support, Linux, Windows. Cloud, Telecoms, Firewalls, IT Systems Engineer Circle Recruitment is acting as an Employment Agency in relation to this vacancy. Earn yourself a referral bonus if you refer somebody else who fills the role! We also offer an iPad if you refer a new client to us and we recruit for them. Follow us on Facebook - Circle Recruitment, Twitter - @Circle_Rec and LinkedIn - Circle Recruitment.