Technical Security Architect

Key Responsibilities

• Security Architecture Design & Development
• Design and develop technical security architectures for new and existing services, platforms, and infrastructure
• Produce detailed security architecture documentation including High-Level Designs (HLDs), Low-Level Designs (LLDs), security patterns, data flow diagrams, and integration specifications.
• Define security architecture principles, standards, and patterns that guide technology decisions across the organisation.
• Ensure security architectures address the full security stack: identity, authentication, authorisation, encryption, network segmentation, boundary protection, endpoint security, logging, monitoring, and incident detection.
• Security Toolset Tech Refresh & Evergreening
• Lead the technical planning, design, and architecture for the refresh and evergreening of the security toolset estate
• Develop tech refresh roadmaps for security toolsets — prioritised by risk exposure, vendor support status, capability gaps, and strategic alignment.
• Evaluate, assess, and recommend security technologies through structured evaluation processes including proof of concept (PoC), proof of value (PoV), and technical benchmarking.
• Cross-Domain Architecture & Pattern Alignment
• Ensure security architectures align with and contribute to cross-domain architectural patterns — including infrastructure, network, platform, application, and data architecture.
• Define reusable security architecture patterns and reference architectures that can be applied consistently across projects and services.
• Collaborate with enterprise architects, infrastructure architects, network architects, and application architects to ensure security is embedded in all architectural decisions — not bolted on.
• Cloud Security Architecture
• Design security architectures for public cloud (AWS, Azure, GCP), private cloud, hybrid cloud, and multi-cloud environments.
• Define cloud security reference architectures
• Identity & Access Management Architecture
• Design and maintain IAM architectures
• Ensure IAM architectures support operational requirements including break-glass procedures, emergency access, and audit trail integrity.
• Boundary & Network Security Architecture
• Design boundary and network security architectures
• Ensure boundary security designs support both traditional perimeter models and Zero Trust Network Architecture (ZTNA) principles.
• Secure Platform Architecture
• Design security controls and hardening standards for platform architectures
• Define secure build standards, hardening baselines (CIS Benchmarks, DISA STIGs), and compliance validation approaches.
• Risk Management & Threat-Informed Design
• Apply threat modelling methodologies (e.g., STRIDE, MITRE ATT&CK, kill chain analysis) to inform security architecture decisions.
• Identify, assess, and document security risks associated with architectural designs, technology choices, and toolset transitions.
• Maintain a security architecture risk register and ensure risks are communicated to stakeholders with clear mitigation recommendations.
• Required Skills & Experience
• Essential
• Significant experience in a Technical Security Architect or Senior Security Engineer role, designing and delivering security architectures in complex enterprise environments.
• TOGAF and/or SABSA certification
• CISSP certification (or equivalent)
• Deep technical expertise across multiple security domains: identity & access management, boundary/perimeter security, cloud security, endpoint security, network security, and secure platform architectures.
• Proven experience leading security toolset refresh, migration, and evergreening programmes.
• Strong experience designing security architectures for cloud environments (AWS, Azure, and/or GCP).
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