What you will do
Act as the design authority for Microsoft Security architecture, covering Defender, Entra ID and Purview capabilities
Define and maintain the target architecture for the Microsoft security platform, aligned to Colt’s Zero Trust strategy
Lead the design and implementation of Microsoft Defender capabilities across endpoints, identities and user-facing services, ensuring integration with wider security tooling where required
Define appropriate integration patterns between Microsoft Defender and non-Microsoft security tooling, particularly across server and infrastructure environments
Design and deliver Microsoft Purview solutions, including Data Loss Prevention (DLP), Information Protection, Insider Risk and data governance
Define and implement identity-first security controls using Entra ID (P2), including Conditional Access, MFA and Privileged Identity Management (PIM)
Support the modernisation of Colt’s SOC operating model, leveraging Defender and Sentinel for user and endpoint telemetry, alongside integration of broader infrastructure data sources
Conduct security architecture reviews and provide assurance for solutions leveraging Microsoft security technologies, including defining requirements and supporting formal sign-off or risk acceptance
Ensure consistent deployment and operationalisation of Microsoft security capabilities at scale, across a complex, hybrid estate
Ensure alignment with regulatory requirements such as TSA, DORA and ISO27001
Drive adoption of Secure by Design principles across Microsoft-based platforms and solutions
Define and implement security and governance controls for Microsoft Copilot and AI/LLM services, ensuring enterprise data is appropriately protected
Assess and mitigate risks associated with AI/LLM usage, including prompt injection, data leakage, over-permissioned access and unintended data exposure
Ensure AI-enabled services follow Zero Trust principles, enforcing least-privilege access to enterprise data accessed by Copilot and related tools
Engage with Microsoft and other vendors to stay aligned with emerging capabilities and roadmap developments, particularly across XDR, data protection and AI
Produce high-quality architecture artefacts, standards and guidance documentation
What we're looking for
Must haves
5+ years of experience in information security within large-scale enterprise or telecommunications environments
Deep expertise in Microsoft 365 E5 security capabilities, including
Microsoft Defender (Endpoint, Identity, Office 365, Cloud Apps)
Microsoft Entra ID (P2), Conditional Access and identity protection
Microsoft Sentinel (SIEM integration)
Microsoft Purview
Strong experience designing and implementing Microsoft Purview capabilities, including DLP, Information Protection, Insider Risk and eDiscovery
Strong understanding of Zero Trust architecture principles, particularly identity-driven security models
Experience deploying and operating Defender and SIEM capabilities, integrated within a wider security ecosystem
Experience conducting security design reviews and translating policy into practical controls
Experience performing risk assessments aligned to recognised methodologies
Strong understanding of cloud security concepts across IaaS, PaaS and SaaS, particularly within Azure environments
Ability to translate complex technical security concepts into clear business-aligned outcomes
Good understanding of networking and enterprise platforms (Windows/Active Directory, Linux/Unix environments)
Engineering/Computer Science degree or equivalent practical experience
Strong team player with the ability to lead initiatives across multiple stakeholders
Excellent communication and stakeholder management skills
Understanding of security risks associated with AI/LLM technologies, including prompt injection, data leakage and over-permissioning risks (e.g. Microsoft Copilot)
Fluent in English (technical and non-technical communication)
Might haves
Experience designing and implementing security and governance controls for AI/LLM platforms, including Microsoft Copilot integrated with Microsoft Purview
Experience consolidating endpoint and SaaS security capabilities into the Microsoft Defender ecosystem
Experience with Security Copilot and security automation
Understanding of Telecoms Security Act (TSA) requirements and implementation approaches
Experience working in regulated environments (telecommunications, financial services, critical infrastructure)
What we offer you
Looking to make a mark?
At Colt, you’ll make a difference. Because around here, we empower people. We don’t tell you what to do.
Instead, we employ people we trust, who come together across the globe to create intelligent solutions.
Our global teams are full of ambitious, driven people, all working together towards one shared purpose: to put the power of the digital universe in the hands of our customers wherever, whenever and however they want.
We give our people the opportunity to inspire and lead teams, and work on projects that connect people, cities, businesses, and ideas. We want you to help us change the world, for the better.
Diversity and inclusion
Inclusion and valuing diversity of thought and experience are at the heart of our culture here at Colt. From day one, you’ll be encouraged to be yourself because we believe that’s what helps our people to thrive. We welcome people with diverse backgrounds and experiences, regardless of their gender identity or expression, sexual orientation, race, religion, disability, neurodiversity, age, marital status, pregnancy status, or place of birth.
Most recently we have
Signed the UN Women Empowerment Principles which guide our Gender Action Plan
Trained 60 (and growing) Colties to be Mental Health First Aiders
Please speak with a member of our recruitment team if you require adjustments to our recruitment process to support you. For more information about our Inclusion and Diversity agenda, visit our DEI pages.
Benefits
Our benefits support you through all parts of life, for both physical and mental health.
Flexible working hours and the option to work from home.
Extensive induction program with experienced mentors and buddies.
Opportunities for further development and educational opportunities.
Global Family Leave Policy.
Employee Assistance Program.
Internal inclusion & diversity employee networks.
A global network
When you join Colt you become part of our global network. We are proud of our colleagues and the stories and experience they bring – take a look at ‘Our People’ site including our Empowered Women in Tech.
