Network Security Architect - Firewalls, DNS, Onpremise, Cloud

We are seeking an experienced Network Security Architect to join a high-profile organisation based in London on an initial 6-month contract. This is an exciting opportunity to play a key role in designing, implementing, and enhancing secure network infrastructure across both on-premise and cloud environments.

You will be responsible for defining network security architecture, driving best practice, and ensuring the resilience, scalability, and security of critical enterprise systems.

• Proven experience as a Network Security Architect within large-scale enterprise environments.

• Strong expertise in:

• DNS architecture and security
• Next-generation firewalls (Palo Alto, Check Point, Fortinet, Cisco Firepower or similar)
• Network segmentation and micro-segmentation
• Secure remote access and VPN technologies
• Load balancing and traffic management
• DDoS protection and network threat mitigation

Experience designing and securing both:

• On-premise network infrastructure
• Public cloud environments (Azure, AWS, or Google Cloud)

Strong understanding of:

• Zero Trust Architecture
• Network Access Control (NAC)
• IDS/IPS technologies
• Routing and switching protocols
• Security frameworks and regulatory standards

Experience producing High-Level and Low-Level Design documentation (HLDs/LLDs).

Excellent stakeholder management and communication skills.

Desirable Skills

• Experience within highly regulated environments.
• Knowledge of cloud-native security services.
• Exposure to Software Defined Networking (SDN).

• Relevant certifications such as:

• CISSP
• CCNP Security / CCIE Security
• Palo Alto PCNSE
• Azure Security Engineer Associate
• AWS Security Specialty

If you are an experienced Network Security Architect with strong expertise across DNS, firewall technologies, cloud security, and enterprise network architecture, we’d love to hear from you.