Senior Network & Security Engineer – Banking – London (Liverpool Street) – Up to £110,000 Basic Salary + 20% Bonus + Hybrid Working
Overview
We are seeking an experienced Network & Security Engineer to join a leading global banking organisation, supporting a highly regulated enterprise network environment across EMEA. This role is responsible for the stability, security, and performance of core network and firewall infrastructure, combining incident ownership with project delivery and ongoing operational support.
This is a hands‑on role offering strong technical exposure, enterprise‑scale networking, and the opportunity to work in a mature, well‑funded financial services environment.
Key Responsibilities
- Own and resolve network and security incidents end-to‑end, acting as a senior technical escalation point
- Support and maintain enterprise network infrastructure including routing, switching, firewalls, and load balancers
- Monitor and optimise network performance and availability
- Deliver network and security project tasks to agreed timelines
- Maintain accurate network diagrams and technical documentation
- Work closely with internal teams and third‑party vendors to support operations and change delivery
- Participate in shift, on‑call, and out‑of‑hours support as required
Skills & Experience
- Strong hands‑on and design experience with Cisco ACI in large‑scale enterprise environments
- Firewall expertise across technologies such as Cisco ASA (or equivalent), including policy design, NAT, VPNs, and troubleshooting
- Advanced routing and switching experience, covering Layer 2 & 3 technologies (OSPF, BGP, VLANs, VXLAN, high availability)
- Load balancer experience (e.g. F5 BIG‑IP or equivalent)
- Experience with Amazon Web Services networking, including VPC design, hybrid connectivity (VPN/Direct Connect), and security controls
- 5+ years’ experience in network design, architecture, and delivery within complex, regulated environments
- Strong operational experience supporting and troubleshooting enterprise network infrastructure across networking, security, and cloud
- Proven experience delivering network migration or transformation projects and producing high‑quality technical documentation
- Good understanding of network security principles, including segmentation, least privilege, and Zero Trust concepts
- Comfortable working across hybrid environments (legacy and modern technologies) in large organisations
Working Pattern
- Monday to Friday core hours
- Participation in a rotating shift pattern (2 in 6)
- Early shifts from 7:00am
- Late cover until 6:00pm
- On‑call, weekend, and occasional bank holiday working as required
- Up to £110,000 Basic Salary
- Up to 20% Bonus
- Hybrid working (2–3 days onsite – Liverpool Street)
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