Network Design Engineer

Onyx-Conseil; Hart; On-site; GBP 50,000 - 70,000; Full time

Job summary

A leading consulting firm in the UK seeks a Senior Network Design Engineer to design and implement network solutions. Responsibilities include troubleshooting, collaborating with stakeholders, and maintaining documentation. The ideal candidate has strong networking knowledge, relevant certifications, and excellent communication skills. This role offers a chance to work on diverse projects in a dynamic environment, contributing to innovative solutions for clients.

Qualifications

• 2+ years of experience with networking layer 2 and layer 3.
• Good understanding of TCP/IP, IPv4/IPv6, VLANs.
• Strong problem-solving and troubleshooting skills.

Responsibilities

• Design and deploy networks to meet organization needs.
• Troubleshoot network issues escalated by support.
• Implement network security measures to protect data.
• Work closely with stakeholders to define requirements.
• Maintain documentation for all implemented networks.
• Mentor junior network engineers to develop skills.
• Automate network tasks to improve efficiency.
• Plan for and respond to service outages.
• Perform network maintenance and upgrades.
• Evaluate new networking technologies.

Skills

Strong technical networking knowledge

Experience with routing protocols

Network security products

Proficiency in F5, Cisco Secure Firewall

Design experience with global vendors

Network device configuration

Understanding of project life cycle

Excellent communication skills

Performance testing of cyber monitoring tools

Education

Certifications such as CCNA, CCNP, or JNCIA

Tools

Visio

Cisco Packet Tracer

SolarWinds

Nagios

Job description

Senior Network Design Engineer

Our purpose is to make the world more sustainable by building trust in society through innovation. As a Network Design Engineer, you will contribute to this by working collaboratively in service and project teams, and designing and implementing medium/large network solutions and changes to enable cost-effective services for our customer.

We are looking for a Senior Network Designer Engineer to work on delivery opportunities. Your role will involve understanding the business and technical requirements and you will be responsible for producing the relevant design collateral (including passing any governance reviews), providing hands‑on configuration and implementation support, troubleshooting technical issues, ensuring effective handover to service and supporting the project team in its milestone deliverables.

Key Skills and Experience

• Strong technical networking knowledge with industry‑recognized certifications (e.g., Cisco CCNA/CCNP, Juniper JNCIS‑ENT).
• Experience with routing protocols, virtual routing instances, VPNs, and security zones.
• Experience with network security products including Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS).
• Proficiency in F5, Cisco Secure Firewall, and Gigamon technology.
• Demonstrable design experience with global network vendors (e.g., Cisco, Juniper).
• Network device configuration, troubleshooting, and defect resolution skills.
• Understanding of project life cycle from requirements gathering to operational acceptance.
• Proven experience in network troubleshooting across multiple vendors and technology areas.
• Excellent communication skills and ability to work with multiple stakeholders.
• Experience of performance testing of cyber monitoring tools (sizing, capacity management and planning, performance troubleshooting).

Responsibilities

• Design and Deploy Functional Networks: Design and deploy networks (LAN, WAN) to meet the organization and customer needs.
• Troubleshoot Network Issues: Diagnose and troubleshoot network issues, including those escalated by lower tiers of support.
• Implement Network Security Measures: Design and implement network security measures to protect data, software, and hardware from threats and unauthorized access.
• Collaborate with Stakeholders: Work closely with executive team members, decision‑makers, and stakeholders to define business requirements and systems goals, and to identify and resolve business systems issues.
• Create and Maintain Documentation: Maintain comprehensive documentation for all implemented networks, including network diagrams, configuration details, and operational procedures.
• Mentor Team Members: Provide guidance and mentorship to junior network engineers and other team members, helping them to develop their skills and knowledge.
• Automate Network Tasks: Develop and implement automation scripts to streamline network management tasks and improve efficiency.
• Plan for Service Outages: Plan for and respond to service outages and other network‑related problems, ensuring minimal disruption to business operations.
• Support Network Upgrades: Perform network maintenance and system upgrades, including service packs, patches, hot fixes, and security configurations.
• Evaluate New Technologies: Stay up‑to‑date with the latest networking technologies and evaluate their potential benefits for the organization and our customers.

Desired Skills, Experience, Qualifications

• 2+ years of experience with networking layer 2 and layer 3.
• Good understanding of network protocols (e.g., TCP/IP, IPv4/IPv6, VLANs).
• Proficiency in network design and implementation tools (e.g., Visio, Cisco Packet Tracer).
• Experience with network management and monitoring tools (e.g., SolarWinds, Nagios).
• Strong problem‑solving and troubleshooting skills.
• Excellent communication and interpersonal skills.
• Ability to work independently and meet deadlines.
• Certifications such as CCNA, CCNP, or JNCIA.

Additional Considerations

• Familiarity with virtualization technologies such as VMware / KVM / RHEV / Xen / ProxMox / CXP‑NG is beneficial.
• A strong understanding of data centre networking and technologies is advantageous.

Due to the nature and urgency of this post, candidates holding or who have held high level security clearance in the past are most welcome to apply. Please note successful applicants will be required to be security cleared prior to appointment which can take up to a minimum 10 weeks. LA International is a HMG approved ICT Recruitment and Project Solutions Consultancy, operating globally from the largest single site in the UK as an IT Consultancy or as an Employment Business & Agency depending upon the precise nature of the work, for security cleared jobs or non‑clearance vacancies, LA International welcome applications from all sections of the community and from people with diverse experience and backgrounds.

Award Winning LA International, winner of the Recruiter Awards for Excellence, Best IT Recruitment Company, Best Public Sector Recruitment Company and overall Gold Award winner, has now secured the most prestigious business award that any business can receive, The Queens Award for Enterprise: International Trade, for the second consecutive period.