Senior Infrastructure EngineerCentral London 550 - 650 p/d - outside IR353 month initial term A well-established, growing business is seeking an experienced Senior IT Infrastructure Engineer to support both core infrastructure and MandA projects. This is a critical role during a period of ambitious expansion, including multiple acquisitions and integration of new sites. You will ensure seamless IT operations, business continuity and secure, resilient infrastructure across offices and acquired businesses. Key Responsibilities: Lead the assessment, integration and consolidation of IT environments during mergers and acquisitions Manage core office and site networks, including LAN/WAN, VPNs, IP addressing and firewall operations (FortiGate)u Conduct audits of IT infrastructure, cloud environments (Azure, AWS) and enterprise applications (ERP, CRM) Plan and execute migrations, including tenant-to-tenant Microsoft 365 and Active Directory consolidations Collaborate with managed service providers and internal teams to maintain high availability, security and compliance Support business continuity through proactive monitoring, incident management and disaster recovery planning Mentor and provide technical guidance to team members and act as an escalation point for complex issues Essential Skills and Experience: Strong expertise in Azure, Microsoft 365, Windows Server and hybrid cloud environments Networking: TCP/IP, DHCP, DNS, routing, switching, VPNs, firewall configuration; CCNA/CC