Job Description

Senior and Principal Security Architects

£50-£90 per hour (Dependent on experience and level) - Inside IR35

12 month contracts

Hybrid - 2/3 days a week on site - Warton (PR4)

**Applicants must have the right to work in the UK**

**Successful applicants must be eligible for SC/DV clearance**

Role Purpose / Overview

Highly experienced security architects with strong technical credentials across enterprise, cloud, network and classified environments. Responsible for designing end-to-end secure architectures (HLD/LLD), leading Design Authorities and Technical Design Authorities, and providing architectural assurance across multi-supplier programmes up to TOP SECRET / Above Secret classifications. Ensures Secure-by-Design principles are embedded from the outset across all programmes.

Key Outcomes

Security is consistently embedded into system design across all programmes

Architectural decisions align with Secure-by-Design principles from the outset

Complex, multi-partner and classified environments are designed securely and coherently

Identity, cross-domain and data protection controls are defined at the architecture level

Design Authority interactions are informed, structured and technically robust

Key Responsibilities

Design end-to-end secure architectures (HLD/LLD)

Lead Design Authorities and Technical Design Authorities

Ensure security is consistently embedded into system design across all programmes

Align architectural decisions with Secure-by-Design principles from the outset

Define identity, cross-domain and data protection controls at the architecture level

Enable structured, technically robust Design Authority interactions

Provide architectural assurance across complex, multi-partner and classified environments

Technical Skills & Experience, a good mix of some or all of the following:

Secure-by-Design (MOD SbD / NIST 800-53r5 / NIST CSF / CIS CSC v8.1) - design, maturity tracking and assurance across full programme lifecycles

Enterprise & Cloud Security Architecture - AWS, Azure, GCP, Oracle Cloud (multi-cloud landing zones, hybrid identity, secure migration patterns)

Classified Platform Design - OFFICIAL, OFFICIAL-SENSITIVE, SECRET and ABOVE SECRET environments, ROSA, Garrison, Citadel, VCF, Cross-Domain Solutions

Zero Trust, IDAM & PKI - conditional access, hybrid identity, cryptography, HSMs, IAM, RBAC, OIDC, federation

Threat Modelling - STRIDE / STRIDE-LM, attack-surface analysis, trust boundary modelling, design reviews

Network & Boundary Security - Checkpoint, Palo Alto, Fortinet, Cisco, Juniper, F5, Zscaler, NSX-T, SD-WAN, encrypted WAN, DMZ, NAC

ServiceNow & M365 Architecture - ITSM, ITOM, CSM, EAM, SharePoint Online, Purview, Entra, Sentinel, Defender, Power Platform, CoPilot

Container & DevSecOps - Kubernetes (EKS, Tanzu), Terraform, Ansible, CI/CD security, image scanning, container hardening

Architecture Frameworks - TOGAF, ArchiMate, SABSA, Zachman, MODAF, JSP standards, NCSC architectural patterns

HLD / LLD authoring, Security Patterns, Reference Architectures, Bill of Materials, Crypto Plans and JSP-compliant documentation

Design Authority leadership, Technical Security Boards, Gateway Reviews, multi-supplier governance

Qualifications & Certifications

CISSP (multiple holders), CISM, CCSP, OSCP, CEH

TOGAF 9 / TOGAF 9.2, SABSA Foundation, Zachman, ITIL v3/v4

AWS Security Specialty, AWS Solutions Architect, AWS DevOps Pro, AWS Advanced Networking

Azure Security Specialist (AZ-500), Azure Solutions Architect (AZ-303/304), Microsoft MCSE

CCIE (#38006), CCNP, CCDP, VCP, VCAP-NV, VCP-NV, Check Point CCSE/CCSA, PCNSE

ISO 27001 Lead Auditor, ISO 27005

Prince2 Practitioner, MSP, Chartered Engineer (IET), MBCS CITP

Government Clearances: SC, DV (active and historic), Five Eyes engagement