Network Design Engineer - Fortinet

Capgemini Engineering; Greater London; Hybrid; GBP 85,000 - 110,000; Full time

Job summary

Capgemini is seeking an experienced network design expert in London to deliver carrier-grade solutions for leading clients. You will author HLD/LLD, review test plans, and drive automation initiatives while ensuring security and high availability across complex service-provider environments.

The role requires deep knowledge of routing, switching, and firewall architectures, plus hands-on experience with Nokia 7750, Fortinet FortiGate, and Cisco IOS platforms.

Qualifications

• Experience designing carrier grade network solutions for projects, complying with client design standards.
• Strong understanding of reliability/availability metrics and the commercial aspects of network solutions.
• Proven track record with service provider technologies for routing, switching and security.
• Ability to elicit business and technical requirements and produce technical artefacts (HLD/LLD).
• Excellent written and verbal communication, capable of driving sign-offs and weekly updates.

Responsibilities

• Author high level and low level design documents to support the client’s network projects.
• Own software/hardware selection, perform bug scrubs and security vulnerability assessments.
• Drive platform improvements to enable automation and DevOps capabilities.
• Steer network security elements’ feature roadmap with partners for release planning and budgeting.
• Demonstrate experience with routers, switches and firewalls from multiple vendors in live environments.

Skills

Carrier grade network design

Cisco IOS-XE / IOS-XR

Firewall architecture

BGP/ISIS/MPLS/L2VPN/L3VPN

Network security planning

Communication skills

Education

Bachelor's degree in a relevant field

Tools

Cisco Routers IOS-XE/IOS-XR

Nokia 7750

Fortinet FortiGate

NETCONF-YANG

Python/Ansible/GIT basics

Job description

Your Profile

• Author High Level and Low Level Design Documents to support client's network
• Own software/hardware selection perform bug scrubs and security vulnerability assessments and work with Test and Delivery engineers to review test plans, defects, test reports, MOP and change tickets.
• Drive platform improvements enable automation and implement new solutions that enable DevOps capabilities and support business strategy of building once and deploy multiple time.
• Competent in designing Carrier grade network solutions for projects, complying with client's design standards
• Good experience with service provider technologies for supporting carrier routing, switching and security
• Elicit business and technical requirements working with various partners during requirements collection phase.
• Strong understanding of Reliability matrix, availability matrix, longevity of design, commercial aspect of solutions
• Steer network security elements’ feature roadmap by working closely with our strategic technology partners for software release planning, budget submissions and provide inputs for case preparation.

Your Profile

• Experience working for a Service Provider
• Competent in designing carrier grade network solutions for projects, complying with client's design standards
• Good experience with service provider technologies for supporting carrier routing, switching and security
• Strong understanding of Reliability matrix, availability matrix, longevity of design, commercial aspect of solutions
• Demonstrable document writing skills in producing artefacts such as HLD and LLD, presentation and technical diagrams as part of project engagements
• Possess excellent communication skills to convey Risks, obtain sign-off, timely elevate issues to management, and send weekly project updates
• Deep knowledge about routers, switches and firewalls from different vendors in live environments
• Strong working experience with Cisco routers – IOS-XE and IOS-XR based
• Solid grasp of firewall architecture, policies and working experience with Palo Alto Firewalls
• Extensive experience on ISIS, BGP, MPLS, L2VPN, L3VPN, RSVP, TE, Hierarchical QOS, LACP, IPv6

Nice to have:

• Ability to apply Open-config and Vendor specific NETCONF-YANG models, JSON and XML payload for network automation to configure and manage firewalls
• Knowledge of Python, Ansible and GIT to manage configuration templates and develop Automation solutions
• Understanding of distributed hardware architecture and hands‑on experience with Nokia 7750
• Knowledge of FortiGate, F5 LTM/GTM (or other load balancing) and Mobile 5G technologies
• Fortinet NSE4 certification and hands‑on experience of FortiGate firewalls, FortiAnalyser and FortiManager

If you're excited about this role but don’t meet every requirement, we still encourage you to apply, your unique experience could be just what we need.

Make it real – what does it mean for you?

• Exposure to top global companies working withCapgemini (145 of the Fortune 500 companies)
• Open access to digital learning platforms
• Active employee networks promoting diversity, equity and inclusion like OutFront, CapAbility or Women@Capgemini

Capgemini is proud to be a Disability Confident Employer (Level 2) under the UK Government’s Disability Confident scheme. As part of our commitment to inclusive recruitment, we will offer an interview to all candidates who:

• Declare they have a disability, and
• Meet the minimum essential criteria for the role.
• Please opt in during the application process.

Capgemini. Make it real.

Need to know

• All roles will require a level of security clearance; BPSS OR Security Clearance OR Developed Vetting.
• Location: London
• Hybrid Working: This is a permanent role with Capgemini, offering a hybrid working model. Regular onsite presence of 2 days per week at client site in Brick Lane, London will be required.
• You can bring your whole self to work. At Capgemini building an inclusive future is part of everyday life and will be part of your working reality. We have built a representative and welcoming environment, for everyone.

About Capgemini

Capgemini is an AI-powered global business and technology transformation partner, delivering tangible business value. We imagine the future of organisations and make it real with AI, technology and people. With our strong heritage of nearly 60 years, we are a responsible and diverse group of over 420,000 team members in more than 50 countries. We deliver end-to-end services and solutions with our deep industry expertise and strong partner ecosystem, leveraging our capabilities across strategy, technology, design, engineering and business operations. The Group reported 2025 global revenues of €22.5 billion.