11th November 2026
Senior Network Security Infrastructure Engineer
Engineering
London
£120,000 - £130,000 per annum + annual discretionary bonus
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.
Consultant - Brendan Connolly
Telephone: 0207 392 7512
Email: brendan.connolly@spencer-rose.com
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