Role: Infrastructure Engineer (PKI) - DV Cleared Duration: 6-month rolling Rate: Up to £500/day Outside IR35 Location: UK Onsite We are seeking a skilled Infrastructure Support Specialist to join our Customers IT Team. This role is key to ensuring the reliability, security, and compliance of our Public Key Infrastructure (PKI) services and related systems. You will provide expert support, manage critical certificates, maintain infrastructure, and enforce security policies.Key Responsibilities include:Deliver advanced 2nd and 3rd line support for PKI infrastructure, including root and issuing CAs, resolving issues related to certificate issuance, revocation, auto-enrolment, and chain validation.Respond to and manage incidents, service requests, and change tickets in line with SLA targets, ensuring timely and effective resolution.Configure, maintain, and support core systems such as AzureAD accounts, SSO applications, Microsoft Intune, and Microsoft Defender monitoring.Oversee CA operations, CRLs, OCSP responders, and backup CA keys; perform patching, updates, and maintain an up-to-date cryptographic inventory.Keep comprehensive PKI documentation, review audit logs, implement role-based access controls, and uphold revocation procedures and security best practices.To find out more, please apply now or drop an email with a copy of your CV to (see below) GCS is acting as an Employment Business in relation to this vacancy.