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Infrastructure Engineer - Network Specialist

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Transact

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Location:
United Kingdom, London

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Category:
IT - Administration

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Contract Type:
Employment contract

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Salary:

Not provided
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Job Description:

We are currently recruiting an exciting opportunity on our IT Infrastructure team. As we continue our IT transformation journey, we are looking to bring in a Network Specialist who will be able to lead the engineering and design of our hybrid infrastructure, championing cyber-secure design principles and drive the business on this journey. This role will involve engineering, designing, monitoring, and supporting our hybrid network infrastructure, encompassing both core data centre and cloud environments. The successful individual will specialise in strategic network engineering and LLD ownership, ensuring the infrastructure runs smoothly, securely, and efficiently to support the organisations goals and objectives.

Job Responsibility:

  • Design, and deploy end-to-end network solutions, including LANs, WANs, WLAN and SD-WAN Solutions, both on-premise and within cloud infrastructure
  • Serve as the subject matter expert for all Azure networking components, leading integration, security, and governance efforts
  • Drive cross-functional collaboration, partnering closely with architecture, cybersecurity, and change delivery teams to ensure network designs and implementations are secure, compliant, and fully aligned with business and technical objectives
  • Drive network automation initiatives, identifying opportunities and implementing solutions (e.g. Ansible) to streamline provisioning, management, and monitoring
  • Manage and monitor networks, servers, and systems to ensure optimal performance. This includes troubleshooting network issues and performing regular maintenance and upgrades
  • Lead network security design and configuration to protect the organisation's data and systems, including setting up firewalls, VPNs, policy-based routing, and zero-trust network security principles
  • Translating High-Level Designs (HLDs) and business requirements into practical conceptual models, while taking full ownership for the creation, documentation, and implementation of detailed Low-Level Designs (LLDs)
  • Proactively managing the capacity and performance of the hybrid network infrastructure, with a focus on Data Center fabric scalability, and raising strategic design proposals for continuous improvement in line with business demands
  • Owning the network infrastructure lifecycle strategy, including vulnerability management, patching governance, and maintenance planning
  • Providing where necessary out of hours support of the IT systems

Requirements:

  • A minimum of 5 years in a network infrastructure engineering role, ideally within Financial Services
  • Advanced experience with Azure Virtual Network (VNet) design (including subnetting, peering, and NSGs)
  • Extensive hands-on experience designing and managing Core and Top-of-Rack (ToR) switching environments, including resilience technologies like VSX or other MC-LAG protocols
  • Proven experience implementing network access control (NAC) and zero-trust principles
  • Working knowledge of configuration management and orchestration tools such as Ansible
What we offer:
  • company discretionary bonus
  • excellent pension contributions
  • an attractive staff share scheme
  • BUPA health insurance
  • buying and selling of annual leave
  • sponsorship of relevant professional qualifications

Additional Information:

Job Posted:
December 13, 2025

Employment Type:
Fulltime
Work Type:
Hybrid work
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