I''m currently partnering with a leading international organisation headquartered in London that''s undergoing a major transformation of its security landscape. As part of this growth, they''re looking to appoint a Principal Information Security Engineer to strengthen their enterprise and cloud security posture. The Role This is a critical technical leadership position focused on implementing and optimising security controls across complex hybrid environments. You''ll be responsible for driving Zero Trust architecture, network segmentation, and championing secure-by-design practices in collaboration with engineering, cloud, and business teams. Key Responsibilities: Lead end-to-end threat assessments and influence secure architecture across enterprise projects Deploy and optimise core security tools (EDR, PAM, AV, DNS, DLP, Cloudflare) Conduct threat modelling, risk assessments, and proactively hunt for threats Collaborate with IT teams to roll out segmentation and extend Zero Trust across environments Take ownership of attack surface reduction, including Red Teaming and vulnerability management Contribute to compliance efforts across GDPR, NIS, ISO 27001 The following experience/skills are essential: Strong hands-on experience across operating systems (Windows andamp; Linux), cloud security (AWS, Azure), and enterprise security tooling Practical knowledge of MITRE ATTandamp;CK, TTPs, and Red Team/Blue Team tactics Experience in Scripting (PowerShell, Python, Bash) and ..... full job details .....