Senior Security Platform Engineer in Hemel Hempstead

Salary: £37,000 - 77,000 per year

Requirements

• Multiple years of experience working in IT and/or Security Operations Centers.
• Experience in a data centre environment preferred.
• Advanced expertise in architecting, implementing, and optimizing SIEM and security platforms across hybrid environments.
• Demonstrated leadership in ICs and SCADA security integration and monitoring within critical infrastructure.
• Deep knowledge of security architecture with hands-on experience designing and integrating multi-layered security solutions across diverse technology stacks.
• Strategic customer engagement mindset with a proactive approach to anticipating security needs, influencing stakeholders, and driving continuous improvement.
• Strong problem-solving skills with a track record of resolving complex security challenges independently and leading cross-functional teams through ambiguity.
• Exceptional attention to detail in high-stakes environments, especially in threat detection, incident response, and documentation.
• Advanced analytical skills with the ability to synthesise threat intelligence, correlate multi-source data, and produce actionable risk insights.
• Polished spoken and written communication skills in English.
• Proven leadership in global security teams, including collaboration, mentoring, and alignment between security operations and business objectives.
• Bachelor’s degree or equivalent in Information Technology or a related field.
• Relevant security certifications such as CySA, PenTest, CCSP, GCIH, OSCP, CISM, or CISSP preferred.
• Relevant IT certifications such as CCNA, CCNP, RHCSA, GRID, GICSP, AZ-500, or SC-200 considered an advantage.
• Advanced experience with security technologies such as SIEM, PAM, IAM, PenTest, Threat Hunting, Firewall, and Proxy, preferably within a global IT services organisation.

Responsibilities

• Serve as a senior member of a 24/7 global cybersecurity team, providing leadership in IT/OT environments with expertise in ICs and SCADA systems.
• Lead the administration and optimization of enterprise security platforms, including break-fix, patching, version upgrades, and integration with broader security ecosystems.
• Direct complex security incident response efforts across endpoint protection, EDR, malware analysis, network forensics, and computer forensics to ensure rapid containment and root cause analysis.
• Design and execute advanced vulnerability assessments using automated and manual techniques, prioritising remediation based on business risk and threat intelligence.
• Continuously monitor threat intelligence feeds and security alerts to identify emerging risks and recommend countermeasures.
• Interpret and synthesise threat reports to guide architectural improvements and validate the effectiveness of security controls.
• Partner with cross-functional teams to develop and implement mitigation strategies, configuration baselines, and patch management frameworks.
• Champion automation initiatives to streamline incident response, threat detection, and reporting workflows using security platforms and scripting.
• Maintain and evolve knowledge base by authoring and reviewing technical articles, playbooks, and SOPs.
• Lead post-incident reviews, driving service recovery, documentation, and preventive measures across teams and vendors.
• Provide expert guidance on specialized security domains and technologies to ensure effective resolution of escalated incidents.
• Ensure meticulous incident logging and collaborate across internal teams, client IT environments, vendors, and carriers to expedite resolution.
• Conduct advanced data correlation and threat hunting across network traffic, email logs, malware samples, web server logs, and DNS records to uncover stealthy threats.
• Lead strategic security projects, mentor junior engineers, and contribute to the evolution of security posture through innovation and thought leadership.

Technologies

• AI
• Firewall
• IAM
• Network Security
• Web

We are the third largest data centre provider, operating more than 150 data centres across over 20 countries and regions. We combine local and global data centre expertise with a connected platform of AI-ready data centres to help our clients scale their digital businesses seamlessly, anywhere and anytime. This role sits within our global data centre cybersecurity organisation and offers the opportunity to work on critical IT/OT security challenges in a highly collaborative, international environment.