Senior Network Administrator

KBR Careers; Leatherhead; On-site; GBP 52,000 - 78,000; Full time

Job summary

KBR, Inc. is seeking a Senior Network Administrator to maintain and secure our global enterprise network infrastructure across LAN, WAN, data centres and cloud connections.

The role demands deep technical knowledge, independent work style, and the ability to resolve complex issues to ensure availability and performance. Responsibilities include administering network security controls, firewall technologies, VPN connectivity, and SD-WAN.

Qualifications

• Bachelor's degree in Information Technology, Computer Science, Engineering, or a related field, or equivalent experience.
• Strong hands-on experience supporting enterprise networking environments.
• Experience with routing, switching, network segmentation, and secure connectivity technologies.
• Experience with network access control, identity-aware networking, and enterprise security platforms.

Responsibilities

• Administer enterprise network infrastructure including LAN, WAN, wireless, and data centre networking platforms.
• Implement routing and switching technologies and SD-WAN environments.
• Administer and support firewall technologies, VPN services, and secure remote-access solutions.
• Support data centre networking, load balancing, and hybrid cloud connectivity.
• Monitor network health, diagnose incidents, and participate in change management.

Skills

Enterprise networking

Routing & Switching

Network security

SD-WAN

VPN & remote access

Windows/Linux virtualization

Education

Bachelor's degree in IT/CS/Engineering

Tools

Firewalls

VPN solutions

Load balancing

Cloud networking

Job description

Title: Senior Network Administrator

KBR is a global provider of differentiated, professional services and technologies delivered across a wide government, defense and industrial base. Drawing from its rich 100-year history and culture of innovation and mission focus, KBR creates sustainable value by combining engineering, technical and scientific expertise with its full life cycle capabilities to help our clients meet their most pressing challenges today and into the future. We deliver science, technology and engineering solutions to governments and companies around the world. KBR employs approximately 37,000 people worldwide with customers in more than 80 countries and operations in over 29 countries. KBR is proud to work with its customers across the globe to provide technology, value-added services, and long-term operations and maintenance services to ensure consistent delivery with predictable results. At KBR, We Deliver.

The Senior Network Administrator is responsible for the administration, maintenance, security, and operational reliability of enterprise network infrastructure supporting KBR operations. The role provides advanced technical administration across network, connectivity, security, and related infrastructure platforms, ensuring the availability, performance, and resilience of critical services. The position requires deep technical knowledge of enterprise networking technologies, the ability to resolve complex operational issues, and the capability to work independently with minimal guidance. The role contributes directly to service stability, operational excellence, and infrastructure modernization initiatives while acting as a technical resource for colleagues within the team. This role does not include supervisory or people management accountability.

Key Responsibilities

• Network Administration
  • Administer enterprise network infrastructure, including: LAN, WAN, wireless, and data centre networking platforms
  • Routing and switching technologies
  • Software-defined networking and SD-WAN environments
  • Network access control and identity-aware networking services
  • Install, configure, maintain, and upgrade network infrastructure in accordance with operational standards.
  • Perform routine lifecycle management activities, including software updates, hardware maintenance, and technology refresh activities.
  • Maintain accurate network documentation, configuration standards, and operational records.
• Network Security & Connectivity
  • Administer and support enterprise network security technologies, including firewalls, VPN services, and secure remote-access solutions.
  • Maintain network segmentation, access control, and secure connectivity frameworks.
  • Support vulnerability remediation and implementation of network security controls.
  • Ensure network services comply with organisational security standards and governance requirements.
• Data Centre & Cloud Networking
  • Support enterprise data centre networking environments and associated connectivity services.
  • Administer load balancing and application delivery platforms.
  • Support hybrid cloud and cloud networking services.
  • Maintain reliable connectivity between on-premises infrastructure, cloud platforms, remote locations, and hosted environments.
  • Support network architecture and capacity growth initiatives.
• Infrastructure Integration
  • Collaborate with server, storage, backup, cloud, and cybersecurity teams to ensure reliable infrastructure operations.
  • Support infrastructure services where networking dependencies exist.
  • Maintain a working understanding of compute, virtualisation, storage, and application dependencies to support effective troubleshooting and escalation.
  • Contribute to infrastructure availability, resilience, and recovery initiatives.
• Operational Support
  • Monitor network health, availability, performance, and capacity using established operational tools and procedures.
  • Diagnose and resolve complex networking and infrastructure incidents.
  • Support incident, problem, and change management processes.
  • Participate in major incident investigations and root‑cause analysis activities.
  • Maintain technical documentation, operational runbooks, and support procedures.
• Recovery, Resilience & Security
  • Support network-related disaster recovery and resilience initiatives.
  • Participate in infrastructure recovery testing and operational readiness activities.
  • Maintain network configurations and controls that support business continuity objectives.
  • Ensure network services remain compliant with organisational security and audit requirements.
• Collaboration & Technical Contribution
  • Work independently on assigned systems and operational activities.
  • Collaborate with related IT teams, service providers, and project teams to resolve technical issues.
  • Act as a technical resource and provide guidance to colleagues with less experience.
  • Contribute to operational improvements, technical standards, and infrastructure modernization initiatives.
  • Support project delivery and technology implementation activities as required.

Qualifications, Skills and Experience

Technical Skills & Experience

• Strong hands‑on experience supporting enterprise networking environments.
• Experience with routing, switching, network segmentation, and secure connectivity technologies.
• Experience with network access control, identity‑aware networking, and enterprise security platforms.
• Experience supporting firewall technologies, VPN solutions, and secure remote access services.
• Experience with load balancing and application delivery technologies.
• Experience supporting cloud networking and hybrid connectivity solutions.
• Experience supporting enterprise infrastructure environments including Windows, Linux, and virtualisation platforms.
• Familiarity with structured IT operational environments and service management processes.
• Experience troubleshooting complex networking and infrastructure‑related issues.

Professional Capability

• Able to work independently with minimal supervision.
• Demonstrated ability to analyse and resolve complex technical problems.
• Exercises sound technical judgement using multiple sources of information.
• Strong operational discipline and attention to detail.
• Effective written and verbal communication skills.
• Ability to collaborate effectively across technical and business teams.

Education & Qualifications

• Bachelor's degree in Information Technology, Computer Science, Engineering, or a related field with relevant experience.
• OR Equivalent combination of related training and professional experience.

KBR Company Information

When you become part of the KBR team, your opportunities are endless. Through collaboration with our customers, we’re defining tomorrow’s challenges, then providing the solutions and services to overcome those challenges, always maintaining our commitment to total safety and reliability. At KBR, we partner with government and industry clients to provide purposeful and comprehensive solutions with an emphasis on efficiency and safety. With a full portfolio of services, proprietary technologies and expertise, our employees are ready to handle projects and missions throughout their entire lifecycle, from planning and design to sustainability and maintenance. Whether at the bottom of the ocean or in outer space, our clients trust us to deliver the impossible on a daily basis. Working at KBR means being rewarded for your contributions. In addition to competitive benefits and professional development, our people are empowered to use all their potential, creating meaningful change for themselves and our clients. We attract the best minds in the world because our expertise thrives on creativity, resourcefulness and collaboration. That is how we supply our clients with cutting‑edge solutions and services.

At KBR — Delivering Solutions, Changing the World. KBR brings together the best and brightest to deliver science, technology and engineering solutions that help governments and companies around the world accomplish their most critical missions and objectives. In everything we do, we are guided by our ONE KBR Values: We Value Our People – We create diverse, inclusive environments in which each person can feel safe, respected and valued, and where everyone has opportunities to grow and reach their full potential. We Deliver – We are uncompromising in our commitment to deliver innovative, high‑quality, technology‑led solutions for our customers and exceptional, sustainable value for all our stakeholders. We Are People of Integrity – We value honesty, trust, courage, fairness, prudence and tenacity. We believe doing what’s right for the planet, the communities where we work, and our people is good for business. We Empower – We empower our people with a shared purpose, the right tools and the supportive culture they need to be proactive decision‑makers, to be adaptive to change, and to succeed. We Are a Team of Teams – We have a will to succeed, but we value the achievements of our team of teams over individual accomplishments. Our collective focus makes us a better, stronger, more effective company. We have also embedded environmental, social and governance (ESG) principles in every business operation and corporate function. Not only are we committed to operating safely, sustainably and equitably, but we are also committed to using our capabilities and expertise to help our customers accomplish their sustainability goals. Worldwide, KBR employs a diverse workforce approximately 29,000 people strong, with customers in more than 80 countries and operations in 40 countries. At KBR, We Deliver.