Network Security Architect

Network Security Architect – Enterprise Transformation

Rate: Up to £850 per day | Inside IR35
Contract: 3 months initially with extension options likely
Location: Hybrid – 1–2 days per week onsite in London
Clearance: Not required
Start: Early-mid November

Overview

We are seeking an experienced Network Security Architect to support a major network transformation programme for a large international professional services organisation.

This is a strategic advisory and architecture role, focused on assessing existing network security environments, defining a vendor-neutral target architecture and supporting future sourcing and procurement decisions.

The successful candidate will combine deep technical network security expertise with strong enterprise architecture and consulting capabilities.

Key Responsibilities

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Assess existing enterprise network security environments, identifying architectural risks, dependencies and modernisation opportunities.

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Define high-level target network security architectures, principles and security guardrails.

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Evaluate Zero Trust, SASE/SSE, SD-WAN, segmentation, encryption and cloud connectivity strategies.

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Develop vendor-neutral architecture recommendations and contribute to transformation roadmaps.

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Assess managed service models, supplier dependencies and opportunities for service disaggregation.

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Translate architectural decisions into procurement-ready technical requirements and supplier evaluation criteria.

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Engage with senior stakeholders, technical teams and incumbent suppliers to validate architectural decisions.

Essential Skills & Experience

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Extensive experience as a Network Security Architect within complex enterprise environments.

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Strong knowledge of WAN/LAN, firewalls, network segmentation, remote access, cloud connectivity and enterprise network security.

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Proven experience with Zero Trust, SASE/SSE and modern network security architecture.

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Experience developing high-level target architectures, transformation strategies and technical roadmaps.

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Understanding of multi-vendor managed network services, supplier transitions and sourcing models.

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Experience translating architecture into procurement specifications, supplier requirements or evaluation criteria.

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Excellent stakeholder engagement, advisory and technical documentation skills.

Highly desirable: Financial services or regulated-sector experience, international transformation programmes, major managed-service re-procurement and relevant architecture certifications (SABSA, TOGAF, CISSP or equivalent).

Apply

If you're an experienced Network Security Architect with strong transformation and advisory experience, please get in touch to discuss this urgent opportunity
Only candidates based in UK and eligible to work in UK are allowed