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About the Role

We are looking for a Security Architect specializing in Cloud Security and Secure Access to join the Security and Resilience – Security Architecture team. This role acts as a subject matter expert across cloud security architecture (IaaS/PaaS) and secure access technologies, with a primary focus on Azure and GCP environments and Colt’s strategic Zscaler platform (ZIA / ZPA). The successful candidate will work closely with Security Engineering, SOC, Threat Intelligence and Risk functions, as well as wider technology teams (Cloud Engineering, Network Engineering, Service Delivery), to design and implement secure, scalable and Zero Trust-aligned architectures.

Responsibilities

Act as the security architecture authority for cloud and secure access solutions, with a focus on Azure, GCP and Zscaler platforms
Define and maintain the target architecture for cloud security and secure access, aligned to Colt’s Zero Trust principles
Design and implement secure architectures for IaaS and PaaS environments, ensuring appropriate controls across networking, compute, storage and identity layers
Lead the design and implementation of Zscaler Internet Access (ZIA) and Zscaler Private Access (ZPA) solutions to enable secure user-to-internet and user-to-application access
Define architectures for Zero Trust Network Access (ZTNA), replacing or reducing reliance on traditional VPN-based access models
Design and implement identity-integrated access controls, leveraging Entra ID and federation technologies such as SAML
Define secure access patterns for internal applications, SaaS services and cloud-hosted workloads
Ensure consistent integration between Zscaler, identity providers (Entra ID) and cloud platforms, supporting seamless authentication and access control
Conduct security architecture reviews and provide assurance for cloud and access-related solutions, supporting formal sign-off or risk acceptance processes
Work with cloud and network engineering teams to ensure secure and scalable implementation of architecture patterns
Support the adoption of Secure by Design principles across cloud-native and access solutions
Ensure alignment with regulatory and compliance requirements such as TSA, DORA and ISO27001
Define and document standard architecture patterns for cloud security and secure access, including segmentation, identity enforcement and traffic control
Assess and mitigate risks associated with cloud-native architectures, including misconfiguration, over-permissioning and insecure exposure of services
Engage with vendors (Zscaler, Microsoft, Google) to stay aligned with roadmaps and emerging capabilities
Produce high-quality architecture artefacts, standards and guidance documentation

Requirements

5+ years of experience in information security within large-scale enterprise or telecommunications environments
Strong experience in cloud security architecture, particularly across Microsoft Azure and Google Cloud Platform (GCP)
Strong experience with Zscaler platform, including Zscaler Internet Access (ZIA) and Zscaler Private Access (ZPA)
Strong understanding of Zero Trust Network Access (ZTNA) and modern secure access architectures
Experience designing secure solutions across IaaS/PaaS environments, including networking, identity and workload protection
Good understanding of identity and authentication technologies, including Entra ID, SAML and federation-based access models
Experience conducting security design reviews and translating policy into enforceable technical controls
Experience performing risk assessments aligned to recognised frameworks
Strong understanding of networking and security technologies, including segmentation, routing, secure access and traffic inspection
Ability to translate complex technical concepts into clear business-aligned outcomes
Experience working in hybrid environments, integrating cloud, on-prem and SaaS services
Strong stakeholder engagement and communication skills (technical and non-technical)
Strong team player, able to lead initiatives across engineering and architecture teams
Fluent in English (technical and non-technical communication)
Experience with additional Zscaler capabilities, including Zscaler Digital Experience (ZDX), Zscaler Deception, ZPA Privileged Remote Access (PRA)
Experience with AWS cloud platform
Experience integrating cloud security with SOC / SIEM platforms
Understanding of Telecoms Security Act (TSA) requirements and implementation patterns
Experience working in regulated environments such as telecommunications or critical infrastructure
Exposure to DevSecOps practices and cloud-native application security

Skills

Cloud Security
Secure Access
Azure
GCP
Zscaler
ZIA
ZPA
Zero Trust Network Access (ZTNA)
IaaS
PaaS
Networking
Identity
Workload Protection
Entra ID
SAML
Federation
Segmentation
Routing
Traffic Inspection
DevSecOps

Location

Global

Work Type

Flexible working hours
Work from home

Experience Level

5+ years of experience in information security

Benefits

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

About the Company

Colt provides network, voice and data centre services to thousands of businesses around the world, allowing them to focus on delivering their business goals instead of the underlying infrastructure.
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.

Equal Opportunity

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.
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.