Cloud Security Architect — ZTNA & Zscaler Expert

Colt Technology Services; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Flexible working hours

Option to work from home

Induction program with mentors

Educational opportunities

Global Family Leave Policy

Employee Assistance Program

Diversity and inclusion networks

Job summary

Colt Technology Services seeks a Security Architect specializing in Cloud Security and Secure Access to join its Security and Resilience – Security Architecture team in London. You will drive secure, Zero Trust-aligned cloud architectures across Azure, GCP and Zscaler, integrating Entra ID and SAML for seamless access control.

In this role you will design secure IaaS/PaaS solutions, lead ZIA/ZPA deployments, and collaborate with SOC, Risk, and Cloud Engineering to ensure compliant, scalable

Qualifications

• 5+ years in information security within large-scale enterprise or telecoms.
• Expertise in cloud security architecture across Azure and GCP.
• Strong experience with Zscaler ZIA and ZPA platforms.
• Solid understanding of ZTNA and secure access architectures.
• Experience designing secure IaaS/PaaS solutions with identity and workload protection.
• Knowledge of Entra ID, SAML and federation-based access models.
• Experience conducting security design reviews and risk assessments.

Responsibilities

• Act as the security architecture authority for cloud and secure access with Azure, GCP and Zscaler focus.
• Define and maintain target cloud security and secure access architectures aligned to Zero Trust principles.
• Design and implement secure IaaS/PaaS architectures across networking, compute, storage and identity.
• Lead the Zscaler ZIA/ZPA deployment to enable secure user-to-internet and user-to-application access.
• Define ZTNA architectures and reduce reliance on VPN-based access.
• Integrate identity controls (Entra ID) and federation technologies (SAML).
• Ensure secure access patterns for internal apps, SaaS and cloud workloads; align with compliance like TSA/DORA/ISO27001.
• Produce architecture artefacts and guidance; engage with vendors to stay aligned with roadmaps.

Skills

Azure

GCP

ZTNA

ZIA/ZPA

Entra ID

SAML

Federation

Cloud security

Hybrid environment

Tools

Zscaler

Entra ID

SAML

Job description

Colt Technology Services seeks a Security Architect specializing in Cloud Security and Secure Access to join its Security and Resilience – Security Architecture team in London. You will drive secure, Zero Trust-aligned cloud architectures across Azure, GCP and Zscaler, integrating Entra ID and SAML for seamless access control.

In this role you will design secure IaaS/PaaS solutions, lead ZIA/ZPA deployments, and collaborate with SOC, Risk, and Cloud Engineering to ensure compliant, scalable