Senior Network & Security Engineer

Prince Resourcing Group; Cardiff; Hybrid; GBP 27,000 - 45,000; Full time

Job summary

Prince Resourcing Group is seeking a Senior Network & Security Engineer in Cardiff with hybrid work. You will own complex projects from discovery to handover, focusing on Fortinet Firewalls, Secure SD‑WAN, and multi‑site deployments, while mentoring engineers and contributing to engineering standards.

The role emphasizes technical leadership over people management, with responsibilities spanning design, testing and customer handover to Managed Services.

Qualifications

• Significant experience delivering complex network and security projects in MSP/consultancy or enterprise.
• Strong hands-on experience designing, deploying and troubleshooting FortiGate firewalls in production.
• Experience with Secure SD-WAN and multi-site environments with dynamic routing over VPN overlays.

Responsibilities

• Lead design, deployment and migration of Fortinet solutions and Secure SD‑WAN.
• Guide projects from discovery through implementation, testing and handover.
• Lead technical workshops, discovery sessions, design reviews and planning meetings.

Skills

Fortinet

Secure SD-WAN

Networking fundamentals

Troubleshooting

Technical leadership

Mentoring engineers

Tools

FortiGate firewalls

Job description

Job Title : Senior Network & Security Engineer

Location : Cardiff – Hybrid

Salary : Up to £45,000

The Opportunity

Are you a senior network and security engineer looking for a role where you can design, deliver and lead genuinely complex technology projects?

We are looking for an experienced Senior Network & Security Engineer to join a Professional Services team and take a leading technical role in delivering enterprise and strategic customer solutions across the UK.

This is far more than a traditional engineering position. You’ll be trusted to take ownership of complex projects from initial discovery and technical design right through to implementation, migration, testing and operational handover.

You’ll work extensively with Fortinet technologies and Secure SD-WAN, while also drawing on your wider networking and security expertise to solve challenging customer environments.

What You’ll Be Doing

You’ll take ownership of the technical delivery of high‑profile customer projects, including complex multi‑site deployments and migrations.

Your responsibilities will include:

• Leading the design, deployment and migration of Fortinet solutions and Secure SD‑WAN.
• Taking projects from technical discovery and requirements gathering through to implementation, testing and handover.
• Leading customer workshops, technical discovery sessions, design reviews and implementation planning meetings.
• Producing and reviewing high-quality Low-Level Designs (LLDs), implementation plans, Methods of Procedure (MoPs), test plans, as‑built documentation and handover packs.
• Providing technical assurance throughout the project lifecycle, identifying risks, dependencies, rollback requirements and appropriate mitigations.
• Acting as the senior escalation point for complex technical issues across firewalls, routing, switching, VPNs, wireless and cloud connectivity.
• Troubleshooting challenging production environments and taking ownership when implementations don't go according to plan.
• Supporting and developing other engineers through mentoring, coaching, peer reviews and knowledge sharing.
• Helping establish and improve engineering standards, reusable templates, reference configurations, automation and best practice.
• Supporting presales activity through technical scoping, solution validation, effort estimation and delivery risk assessment.
• Building trusted relationships with senior customer stakeholders, partners and technology vendors.
• Leading testing and customer acceptance before ensuring a smooth transition into Managed Services.
• This is a technical leadership role rather than a people‑management position. You’ll be the person others turn to for guidance, assurance and expertise.

What You’ll Bring

We’re looking for an accomplished network and security professional who enjoys solving complex problems and delivering high‑quality customer outcomes.

• Significant experience delivering complex network and security projects within an MSP, consultancy or enterprise environment.
• Strong hands‑on experience designing, deploying and troubleshooting FortiGate firewalls in production environments.
• Strong networking fundamentals across routing, switching, TCP/IP, VLANs, dynamic routing, IPsec VPNs, HA and network security.
• Experience designing and implementing Secure SD‑WAN, ideally across multi‑site environments and with dynamic routing over VPN overlays.
• Exceptional troubleshooting and diagnostic ability, with the confidence to lead technical recovery when things don't go to plan.
• A strong track record of producing clear, accurate and professional customer‑facing technical documentation.
• The confidence to lead technical workshops and communicate effectively with engineers, project teams and senior customer stakeholders.
• A collaborative mindset, with a genuine interest in mentoring engineers and raising technical standards.
• Strong ownership and organisational skills, alongside an understanding of project scope, effort, commercial considerations and change control.

If you're an experienced security engineer ready for your next technical challenge, this could be an excellent opportunity to take your expertise to the next level.