iO Associates
Principal Network Security Consultant
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Principal Network Security Consultant
CRITICAL — Principal Network Security Consultant
Role Overview
Our client is a leader in secure data centre and high-security network environments, serving technology and government sectors. They are known for delivering innovative, compliant, and resilient solutions in mission-critical settings.
Position Summary
We are seeking a highly experienced Principal Network Security Consultant for an initial 6-month contract (with strong potential for extension) to lead the design and implementation of robust network security architectures in sensitive, high-security data centre and hybrid cloud environments. You will act as the senior technical authority, providing expert guidance on security strategy, design, and delivery and mentoring teams—ensuring strict adherence to regulatory standards.
Key Details
- Employment Type: Contract
- Rate: Contact Me
- Duration: 6 months (initial), with potential for extension
- Location: Hybrid / Client sites (regular on-site presence required for high-security environments)
- Clearance: Active Developed Vetting (DV) or eDV/MoD DV
Key Responsibilities
- Lead end-to-end technical design of advanced network security solutions (including secure data centre configurations and hybrid cloud architectures).
- Develop High-Level Designs (HLD), Low-Level Designs (LLD), implementation plans, testing strategies, and handover documentation.
- Advise on and implement:
- Network segmentation, micro-segmentation, firewall policy optimisation
- Secure enclave strategies for high-sensitive workloads
- Design secure routing, switching, and connectivity solutions ensuring high availability, resilience, and performance.
- Define and implement secure remote access, privileged access management, and Zero Trust models.
- Collaborate with stakeholders (across security, infrastructure, and service delivery teams) to ensure project success.
- Support incident response and root cause analysis for network security events.
- Produce detailed technical documentation (build guides, as-built records, and operational procedures).
- Mentor junior engineers and delivery teams on best practices for secure network design and implementation.
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Essential Skills & Experience
- Significant senior/lead experience in network security consulting or architecture within regulated, government, or defence environments.
- Hands-on expertise in data centre network design (routing/switching protocols: BGP, OSPF, VLANs, VRFs, QoS).
- Deep experience with enterprise firewall platforms (e.g., Palo Alto, Fortinet, Check Point, Cisco ASA/FTD).
- Proven track record in delivering:
- Secure network segmentation
- Controlled inter-zone connectivity
- Secure ingress/egress traffic management
- Firm understanding of NAC (e.g., Cisco ISE), encryption, Zero Trust principles, and audit/compliance requirements.
- Experience in resilient, high-availability network architectures.
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- Clearance requirement: Active DV (Developed Vetting) or equivalent (eDV/MoD DV).
Desirable Skills & Experience
- Experience integrating with SIEM platforms (Splunk, Microsoft Sentinel, ArcSight).
- Knowledge of load balancers/Application Delivery Controllers (F5, A10) in secure environments.
- Expertise in infrastructure-as-code tools (Ansible, Terraform) for network and security automation.
- Relevant certifications such as: CCNP/CCIE (Security), PCNSE, CISSP, GIAC, NSE, or CCSE.
Please submit your CV for immediate consideration if you meet these criteria. This is an opportunity to work on high-impact security projects within a challenging and rewarding environment.
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