We are seeking a Senior Identity Security Engineer to design, implement and enhance large-scale identity environments across Microsoft Active Directory, Entra ID, PKI/ADCS and modern hybrid platforms. This role combines hands‑on engineering with leadership in security design, implementation and assessment, requiring someone who can resolve complex identity challenges end‑to‑end and deliver robust, high‑impact solutions. You will work closely with engineering, architecture and operational teams, across a range of sectors, to deliver secure, resilient identity and certificate services across on‑premises, hybrid and cloud environments.