Senior Network Security Infrastructure Engineer

Senior Network Security Infrastructure Engineer

City of London (hybrid)

£120,000 - £130,000 per annum + annual discretionary bonus

We are supporting a Leading City of London based financial services organisation who are looking for an experienced Senior Network Security Infrastructure Engineer to play a key role in designing, building, and operating secure, scalable, and highly resilient network security platforms across both cloud and on-premises environments. This is an opportunity to join a highly skilled technology team where you'll influence strategy, drive automation, and help modernise critical enterprise infrastructure.

The organisation is pleased to offer the role on a hybrid basis, requiring 3 days a week in their City of London based office, therefore you must be within a reasonable and commutable distance to London.

Responsibilities

• Design, engineer, deploy, and optimise enterprise network security solutions across cloud and on-premises environments.
• Lead infrastructure automation initiatives using Terraform, Python, Ansible, and related technologies.
• Develop Infrastructure as Code (IaC) solutions to support scalable and repeatable deployments.
• Integrate security controls and automation into modern CI/CD pipelines.
• Act as the technical authority for network security infrastructure, providing guidance on architecture and best practices.
• Drive continuous improvement across performance, resilience, security, and operational efficiency.
• Support governance, compliance, audit, and risk management requirements.
• Mentor engineers and promote a culture of technical excellence and continuous improvement.
• Provide senior technical leadership during major incidents and complex problem investigations.

Essential Experience

• Strong commercial experience working with Fortinet security technologies.
• Proven expertise designing and securing AWS networking environments, including:
  • AWS Cloud WAN
  • AWS WAF
  • AWS Firewall Manager
  • AWS Transit Gateway
  • AWS Direct Connect
• Advanced knowledge of Terraform and Infrastructure as Code methodologies.
• Experience with GitLab and modern source control practices.
• Strong understanding of enterprise Firewall technologies across both cloud and traditional infrastructure.
• Deep knowledge of networking technologies including TCP/IP, BGP, OSPF, routing, switching, VPNs, DNS, load balancing, and network segmentation.
• Experience implementing security automation using Python, Ansible, or equivalent tooling.
• Strong understanding of cloud identity, access management, authentication, authorisation, certificates, and cryptography.
• Excellent troubleshooting, stakeholder management, and communication skills.

Desirable Experience

• AWS certifications such as AWS Certified Advanced Networking - Specialty or AWS Certified Security - Specialty.
• Experience with observability, monitoring, and telemetry platforms.
• DevOps and CI/CD implementation experience.
• Knowledge of Site Reliability Engineering (SRE) principles.
• Experience working within highly regulated environments.
• Understanding of security frameworks such as ISO 27001 and SOC 2.
• Exposure to Zero Trust networking and modern cloud security architectures.