Network Engineers (DV Security Clearance)
Company
CGI
Location
London
Employment Hours
Full Time
Employment Type
Permanent
Salary
Job Requirements/Description
Network Engineers (DV Security Clearance)
Position Description
CGI's Space, Defence and Intelligence business unit delivers innovative, secure, and mission-critical technology solutions to some of the UK government's most complex challenges. Our teams design, build, operate, and modernise large-scale infrastructure estates, working in close partnership with our clients to ensure resilience, performance, and security.
We are seeking a Senior Network Engineer to provide hands-on technical expertise across network design, automation, operations, and modernisation initiatives. You will play a key role in sustaining and evolving complex networking environments, including legacy infrastructure, while contributing to the delivery of next-generation hybrid and multi-cloud network architectures.
This role suits an experienced, self-motivated engineer with strong networking fundamentals, a passion for automation, and the ability to operate effectively in highly secure environments.
Due to the nature of the work, this role is open only to sole UK Nationals who hold or are eligible for DV / HLC clearance, and requires full onsite attendance.
Your future duties and responsibilities
Network Design & Architecture
Design and implement scalable, resilient LAN, WAN, and data centre network architectures.
Design and deploy next-generation hybrid and multi-cloud WAN solutions using physical and virtual appliances.
Implement application and network policies within Cisco SD-WAN environments.
Network Operations & Support
Maintain and support legacy and end-of-life network infrastructure, ensuring high availability, reliability, and performance.
Diagnose and resolve complex issues across LAN, WAN, VPN, and data centre environments.
Participate in incident, problem, and capacity management processes.
Automation & Infrastructure as Code
Develop and implement network automation solutions using scripting languages such as Python.
Automate configuration, deployment, and operational tasks, including event-driven automation.
Contribute to network automation initiatives alongside DevOps and development teams.
High Availability & Load Balancing
Design, implement, and validate high-availability network solutions.
Configure and manage load balancing technologies to ensure optimal traffic distribution.
Perform testing and validation to ensure network resilience and failover effectiveness.
Monitoring, Change & Modernisation
Monitor network traffic and performance, identifying and resolving bottlenecks.
Implement network changes, upgrades, and patching through controlled change management processes.
Support network modernisation and migration initiatives to contemporary platforms and cloud services.
Collaboration & Documentation
Work closely with infrastructure, service management, security, and application teams.
Produce and maintain clear network documentation, including designs, configurations, and procedures.
Provide guidance and mentoring to junior engineers where required.
Required qualifications to be successful in this role
Strong experience in network engineering and architecture, including LAN, WAN, and data centre environments.
Hands-on experience with Cisco networking technologies, including Cisco SD-WAN.
Solid understanding of IP networking, routing and switching protocols.
Experience with multicast network flows, load balancing, and high-availability solutions.
Proven experience supporting business-critical network infrastructure in secure environments.
Strong troubleshooting and operational support skills.
Experience working within structured delivery frameworks (e.g. backlog-driven delivery, PI planning, change control).
Together, as owners, let's turn meaningful insights into action.
Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you'll reach your full potential because
You are invited to be an owner from day 1 as we work together to bring our Dream to life. That's why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company's strategy and direction.
Your work creates value. You'll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise.
You'll shape your career by joining a company built to grow and last. You'll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.
Come join our team-one of the largest IT and business consulting services firms in the world.
Position Description
CGI's Space, Defence and Intelligence business unit delivers innovative, secure, and mission-critical technology solutions to some of the UK government's most complex challenges. Our teams design, build, operate, and modernise large-scale infrastructure estates, working in close partnership with our clients to ensure resilience, performance, and security.
We are seeking a Senior Network Engineer to provide hands-on technical expertise across network design, automation, operations, and modernisation initiatives. You will play a key role in sustaining and evolving complex networking environments, including legacy infrastructure, while contributing to the delivery of next-generation hybrid and multi-cloud network architectures.
This role suits an experienced, self-motivated engineer with strong networking fundamentals, a passion for automation, and the ability to operate effectively in highly secure environments.
Due to the nature of the work, this role is open only to sole UK Nationals who hold or are eligible for DV / HLC clearance, and requires full onsite attendance.
Your future duties and responsibilities
Network Design & Architecture
Design and implement scalable, resilient LAN, WAN, and data centre network architectures.
Design and deploy next-generation hybrid and multi-cloud WAN solutions using physical and virtual appliances.
Implement application and network policies within Cisco SD-WAN environments.
Network Operations & Support
Maintain and support legacy and end-of-life network infrastructure, ensuring high availability, reliability, and performance.
Diagnose and resolve complex issues across LAN, WAN, VPN, and data centre environments.
Participate in incident, problem, and capacity management processes.
Automation & Infrastructure as Code
Develop and implement network automation solutions using scripting languages such as Python.
Automate configuration, deployment, and operational tasks, including event-driven automation.
Contribute to network automation initiatives alongside DevOps and development teams.
High Availability & Load Balancing
Design, implement, and validate high-availability network solutions.
Configure and manage load balancing technologies to ensure optimal traffic distribution.
Perform testing and validation to ensure network resilience and failover effectiveness.
Monitoring, Change & Modernisation
Monitor network traffic and performance, identifying and resolving bottlenecks.
Implement network changes, upgrades, and patching through controlled change management processes.
Support network modernisation and migration initiatives to contemporary platforms and cloud services.
Collaboration & Documentation
Work closely with infrastructure, service management, security, and application teams.
Produce and maintain clear network documentation, including designs, configurations, and procedures.
Provide guidance and mentoring to junior engineers where required.
Required qualifications to be successful in this role
Strong experience in network engineering and architecture, including LAN, WAN, and data centre environments.
Hands-on experience with Cisco networking technologies, including Cisco SD-WAN.
Solid understanding of IP networking, routing and switching protocols.
Experience with multicast network flows, load balancing, and high-availability solutions.
Proven experience supporting business-critical network infrastructure in secure environments.
Strong troubleshooting and operational support skills.
Experience working within structured delivery frameworks (e.g. backlog-driven delivery, PI planning, change control).
Together, as owners, let's turn meaningful insights into action.
Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you'll reach your full potential because
You are invited to be an owner from day 1 as we work together to bring our Dream to life. That's why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company's strategy and direction.
Your work creates value. You'll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise.
You'll shape your career by joining a company built to grow and last. You'll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.
Come join our team-one of the largest IT and business consulting services firms in the world.