Security Engineer Infrastructure / Cryptography / Automation £500£700 per day (Inside IR35) Cheshire 2 days per week onsite (mandatory) Initial 12-month contract Atrium EMEA are supporting a world-leading IT services client on their search for multiple Security Engineers to join a long-term financial services programme. We are hiring across several specialist areas within secure enterprise infrastructure. These roles sit within a highly regulated environment and require strong hands-on engineering capability. We are particularly interested in professionals with experience in one or more of the following areas: Cryptography engineering, including Hardware Security Modules (HSMs) such as Thales, Entrust or IBM platforms Infrastructure and security engineering across Windows, Unix/Linux, networking and firewalls Python-based automation, REST API integration and workflow improvement within secure environments These are build-focused engineering roles not support or helpdesk positions. Candidates should have experience working within enterprise or financial services environments and be comfortable operating within structured, security-controlled infrastructure. Key Requirements: Strong hands-on engineering background within security or infrastructure Experience working within regulated enterprise environments Ability to work onsite in Cheshire 2 days per week Willingness to support occasional data centre deployments where required This is an excellent opportunity to join a long-term programme delivering critical secure infrastructure within a major financial services environment.