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, ...

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