Trellint UK
Senior Network Engineer
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Job Summary
As a Senior Network Engineer, you will lead the design, implementation, and support of enterprise network infrastructure across our UK data center and office environments. This role is focused on data center networking, load balancing, and core network services, ensuring high availability, performance, and security across all platforms.
Job Description
Exciting Opportunity: Senior Network Engineer
Are you a seasoned network professional ready to lead the design, implementation, and evolution of enterprise network infrastructure? We are seeking a Senior Network Engineer to drive the planning, deployment, and optimization of our critical IT and security platforms. In this role, you’ll architect solutions, mentor team members, and ensure the seamless delivery of secure, reliable services across the organization.
About Us
Join a forward-thinking company committed to pushing the boundaries of technology and driving innovation. Our team is made up of passionate individuals who thrive in a collaborative environment and are dedicated to shaping the future of our industry.
Your Role
As a Senior Network Engineer, you will lead the design, implementation, and support of enterprise network infrastructure across our UK data center and office environments. This role is focused on data center networking, load balancing, and core network services, ensuring high availability, performance, and security across all platforms.
What You’ll Do
Strategic Support & Risk Awareness
- Proactively identify operational risks, performance issues, and security gaps within network and infrastructure environments
- Monitor trends, alerts, and emerging technologies to support continuous improvement of network reliability and security
- Contribute technical input to infrastructure and network strategy under the direction of IT leadership
Network Design & Implementation
- Design, configure, and support enterprise network infrastructure across UK-based data centers and offices
- Implement and maintain FortiGate firewalls, including policies, NAT, and high-availability configurations
- Deploy and support FortiADC load balancers, including application delivery, traffic distribution, and high-availability designs
- Configure and manage Dell L2/L3 switching environments, including VLANs, trunking, and inter-VLAN routing
- Design and maintain core routing architecture using protocols such as OSPF
- Provide secure VPN access into the data center for administrative and operational access
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Operations & Troubleshooting
- Provide advanced troubleshooting across routing, switching, firewalls, and load balancing platforms
- Support network monitoring, logging, and alerting to ensure high availability and performance
- Participate in incident response and root cause analysis for network-related outages
Security & Compliance
- Implement and maintain network security controls aligned with ISO 27001 and Cyber Essentials Plus
- Ensure proper segmentation, VLAN design, and access controls across environments
- Support audit activities through documentation, configurations, and evidence collection
Change Management & Documentation
- Support network connectivity for co-located UK data center environments
- Manage cross-connects, switching infrastructure, and carrier handoffs
- Ensure resilient and redundant network designs aligned to production requirements
Technologies
- Fortinet Firewalls (FortiGate)
- FortiADC (load balancing and application delivery)
- Dell networking (Layer 2 / Layer 3 switching platforms)
- Routing (OSPF)
- VLAN design and network segmentation
- Layer 2 / Layer 3 switching
What You Bring to the Role
Education
- Bachelor’s degree in Computer Science, Computer Information Systems, or related field.
- Relevant certifications such as CCNP, CCIE, CISSP, or equivalent are preferred.
Experience
- 7+ years of enterprise network engineering experience in data center-centric environments
- Strong hands-on experience with:
- Deep experience with:
- Experience supporting high-availability network architectures
- Experience supporting ISO 27001 and Cyber Essentials Plus compliance environments
- Experience working in 24x7 production environments with on-call responsibilities
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Skills
- Core Networking
- Advanced TCP/IP networking fundamentals
- Routing, switching, VLANs, and segmentation
- Dell switch configuration and troubleshooting
- Load Balancing & Application Delivery
- FortiADC configuration and support
- Traffic distribution, persistence, health checks, and high availability
- Firewall & Security
- FortiGate configuration, NAT, policy management, logging, and high availability
- Network segmentation and access control
- Connectivity
- Secure remote access via VPN for administrative and operational use
Work Environment
This position offers remote-first flexibility, with hybrid or on-site options available. Occasional travel to offices or vendor sites may be required based on project needs.
Why You’ll Love It Here
- Strategic Impact: Lead mission-critical IT projects with direct visibility to senior leadership.
- Ownership & Autonomy: You’ll own the project plan — and the outcome.
- Collaborative Team: Work closely with experienced IT, business, and R&D professionals who value structure and results.
- Flexibility & Growth: Enjoy a flexible work environment with room for continued professional development.
Ready to lead strategic IT projects with precision and impact? Apply now and help shape the future of our infrastructure and operations.
We are committed to building a diverse and inclusive team where everyone feels empowered to contribute and grow. If you meet most of the qualifications and are excited about the role, we encourage you to apply.
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