Network Engineer L3

Claranet Limited; Gloucester; On-site; GBP 55,000 - 75,000; Full time

Job summary

Claranet Limited in the United Kingdom is seeking an experienced Network Engineer with strong Netskope expertise to support migrations, transformations and implementations at engineering level.

You will diagnose and resolve complex incidents across SDWAN, WAN, LAN/WLAN and VPN/SASE, implement changes using approved templates, ensure regulatory compliance, contribute to CMDB enrichment, and provide guidance to Level 2 engineers while maintaining audit trails and governance records.

Qualifications

• 4+ years hands-on experience in network engineering in regulated/financial environments.
• Strong understanding of network principles, design, operational environments, and compliance requirements.
• Proven experience with complex incident resolution, change management, and performance optimisation.
• Experience with data centre network technologies, cloud and security services (Azure, AWS, Load Balancing, DNS).
• Fluent written and spoken English; ability to produce audit-ready documentation and communicate confidently with senior stakeholders.
• SASE management (Fortinet / Netskope).

Responsibilities

• Diagnose and resolve complex incidents across SDWAN, WAN, LAN/WLAN, VPN/SASE, and load-balancing platforms, ensuring regulatory compliance.
• Implement network configuration changes using approved templates and security baselines, maintaining audit trails.
• Validate device configurations, firmware posture, and compliance with golden standards and sector-specific requirements.
• Support onboarding of new sites/services using Zero-Touch Provisioning (ZTP) and Infrastructure-as-Code pipelines.
• Manage routing policies, QoS, wireless performance tuning, and load balancer configuration updates.
• Collaborate with vendor management teams on escalated transport or device issues, ensuring regulatory requirements are met.
• Contribute to CMDB enrichment through topology validation and asset reconciliation.
• Support automated impact assessments and change risk analysis, with a focus on operational resilience.
• Participate in continuous service improvement (CSI) initiatives, such as monitoring optimisation and capacity analysis.
• Provide technical guidance and mentoring to Level 2 engineers

Skills

Routing & Switching

SD-WAN

Wireless LAN

Load Balancing

Python Scripting

Terraform/Ansible

Troubleshooting

Networking Compliance

Documentation

CI/CD for Network

Tools

Fortinet

Cisco

Netskope

ServiceNow

Job description

Please note this role requires strong Netskope experience, involving migrations/transformations/implementations at Engineering level.

Essential Roles & Responsibilities

• Diagnose and resolve complex incidents across SDWAN, WAN, LAN/WLAN, VPN/SASE, and load-balancing platforms, ensuring compliance with financial services regulations
• Implement network configuration changes using approved templates and security baselines, maintaining audit trails
• Validate device configurations, firmware posture, and compliance with golden standards and sector-specific requirements
• Support onboarding of new sites/services using Zero-Touch Provisioning (ZTP) and Infrastructure-as-Code pipelines
• Manage routing policies, QoS, wireless performance tuning, and load balancer configuration updates
• Collaborate with vendor management teams on escalated transport or device issues, ensuring regulatory requirements are met
• Contribute to CMDB enrichment through topology validation and asset reconciliation
• Support automated impact assessments and change risk analysis, with a focus on operational resilience
• Participate in continuous service improvement (CSI) initiatives, such as monitoring optimisation and capacity analysis
• Provide technical guidance and mentoring to Level 2 engineers

Financial Services & Regulatory Compliance

• Ensure all network operations adhere to financial services regulations and frameworks (e.g., FCA, PRA, DORA, ISO 27001, SOC)
• Maintain documentation and audit trails for all changes, incidents, and compliance activities
• Support risk assessments, compliance reviews, and operational audits as required
• Integrate regulatory requirements and security controls into network designs and operations

Governance & Reporting

• Maintain accurate incident, request, and change records in ServiceNow
• Produce and present operational reports, dashboards, and summaries for internal and customer stakeholders, highlighting compliance, risk management, and performance
• Support governance initiatives including process improvement, risk analysis, and post-implementation reviews

Key Skills

• Advanced routing & switching (BGP/OSPF, ACLs, NAT)
• SDWAN technologies (e.g. Fortinet, Cisco)
• Wireless LAN operations and performance tuning
• Familiarity with F5 or equivalent load-balancing platforms
• Exposure to automation or scripting (Python, Terraform, Ansible)
• Strong troubleshooting and analytical skills
• Experience with network compliance, configuration management, and infrastructure documentation
• Familiarity with automation frameworks and CI/CD for network configuration (Python, Terraform, Ansible)

Behavioural Competencies – Organisational & Behavioural Fit

Essential:

• 4+ years' hands-on experience in network engineering, including advanced support and implementation for regulated/financial environments
• Strong understanding of network principles, design, operational environments, and compliance requirements
• Proven experience with complex incident resolution, change management, and performance optimisation
• Experience with data centre network technologies, cloud and security services (Azure, AWS, Load Balancing, DNS)
• Effective under pressure; strong written and verbal communication
• Familiarity with ITSM workflows, SDWAN/VPN concepts, and ServiceNow
• SASE management (Fortinet / Netskope)
• Fluent written and spoken English is essential. The role requires the ability to produce audit ready documentation and communicate confidently with senior and executive level stakeholders

Highly Desirable:

• Experience in managed service or telecom environments, especially for financial services clients
• Hands-on provisioning/troubleshooting with Voice technologies (Avaya, Cisco Call Manager)
• Relevant certifications (CCNP, Fortinet NSE5/7, Meraki ECMS2, F5)
• Experience with SolarWinds, Infoblox, Zero-Touch Deployment, automation tools

Critical Competencies – General Fit

Personal Attributes:

• Technical leader and mentor, passionate about advanced troubleshooting and optimisation
• Strong compliance and risk awareness, with attention to regulatory detail

Shift & Working Pattern:

• Standard business hours, with participation in an oncall rota as required
• Occasional weekend engineering coverage will be required, typically limited to a small number of planned weekends per year, to support business continuity, resilience testing, or disaster recovery activities