Network Security Engineer

Network Security Engineer
Rate: up to £490 per day - Umbrella only
Duration: 4 months

Location:

Knutsford 3 day onsite

Clearance Required:

BPSS

Description:

As an experienced Network Security Engineer, you will play a key role in designing, implementing, securing, and optimising enterprise network security services across on-premises, cloud, and hybrid environments. Your expertise will be utilised to strengthen the organisation's cyber defence capabilities, drive network security innovation, automate security operations, and ensure resilient, secure, and scalable connectivity solutions.

You will work closely with architecture, engineering, operations, cloud, and business teams to deliver secure network services, respond to emerging threats, and support the adoption of modern network security technologies. The role requires a strong focus on automation, continuous improvement, operational excellence, and adherence to security and regulatory requirements.

Primary Responsibilities

Network Security Engineering & Delivery

Lead the implementation, engineering and operational support of Island Enterprise Browser services across enterprise environments.
Develop and maintain browser security policies to protect sensitive data, secure third-party access and support workforce mobility initiatives.
Collaborate with Security Architecture, End User Computing, Identity & Access Management and Security Operations teams to deliver secure browser-based access solutions.
Support browser modernisation initiatives that replace traditional VPN and endpoint-centric security controls with Zero Trust access models.
Design, implement, and maintain secure enterprise network infrastructure and security controls aligned to organisational strategy and security standards.
Drive network security enhancements and modernisation initiatives within agreed budgets, timelines, and risk appetites.
Support the delivery of secure connectivity solutions across cloud, on-premises, and hybrid environments.
Collaborate with architects and engineers to develop High Level Designs (HLDs) and Low Level Designs (LLDs) into operational solutions.

Network Security Operations & Governance

Lead operational readiness and transition requirements from design/build phase to BAU
Lead policy governance, including rule review, optimisation, recertification, and compliance management processes.
Drive continuous improvement of network security operations through automation, policy simplification, and control standardisation.
Identify opportunities to reduce operational risk through proactive firewall rule analysis, remediation, and optimisation activities.
Partner with Infrastructure, Security Architecture, Engineering, and Cyber Defence teams to deliver secure network services and strategic security initiatives.
Collaborate with leadership teams to align network security capabilities with broader technology, resilience, and cyber security strategies.

Security Automation & Engineering

Develop and implement automated solutions for network security administration, policy management, compliance validation, and operational processes.
Drive the adoption of Infrastructure as Code (IaC), Security as Code, and automated governance controls across network security platforms.
Contribute to enterprise-wide initiatives focused on network visibility, security posture improvement, and operational efficiency.

Security Operations & Risk Management

Monitor and analyse browser security events, policy violations and suspicious user activity to support threat detection and incident response activities.
Support investigations involving browser session activity, data protection events and secure application access controls.
Monitor, analyse, and respond to network security incidents, vulnerabilities, and emerging threats.
Support threat detection, containment, remediation, and post-incident reviews.
Ensure network security controls remain effective, compliant, and aligned with evolving cyber threats.
Conduct security assessments, rule reviews, and network segmentation activities.

Security Architecture & Standards

Ensure network architectures comply with security standards, secure-by-design principles, and software development lifecycle requirements.
Support the implementation of Zero Trust, defence-in-depth, and least privilege security models.
Maintain awareness of current industry threats, vulnerabilities, and security technologies.

Standard Technical Skills & Competencies

Strong understanding of SWG controls
Island Enterprise Browser, extension and agent engineering
Strong understanding of TLS interception
Proxy & Secure Web Gateway Technologies
Zero Trust Network Access (ZTNA)
Strong understanding of authentication method at enterprise level
Strong understanding of content controls (request and response mode)
Network Security Automation (Python, Power Shell, APIs, Terraform)
Cloud Security & Secure Connectivity
Identity Integration (Entra , Conditional Access, MFA)
Enterprise Browser & Secure Access Technologies & Security Policy…