2,225 Network Testing jobs in the United Kingdom

• Monitor, analyze, and report on telecommunications network performance KPIs.
• Identify and troubleshoot network degradations and performance bottlenecks.
• Develop and implement strategies for network optimization and capacity planning.
• Conduct root cause analysis for network issues and recommend corrective actions.
• Collaborate with network operations and design teams to implement improvements.
• Develop and maintain automated performance reporting and alarming systems.
• Lead and mentor junior performance engineers.
• Stay current with emerging network technologies and performance best practices.
• Provide technical expertise on network performance to cross-functional teams.

• Bachelor's degree in Electrical Engineering, Telecommunications, Computer Science, or a related field.
• Minimum of 7 years of experience in telecommunications network performance analysis.
• In-depth knowledge of mobile (4G/5G) and fixed-line network technologies.
• Proficiency with network performance monitoring tools and techniques.
• Strong data analysis and troubleshooting skills.
• Experience with scripting languages (e.g., Python, Perl) for automation.
• Excellent communication and leadership abilities.
• Ability to work independently and manage tasks effectively in a remote environment.

• Monitor and analyze 5G network performance metrics (throughput, latency, reliability).
• Identify network performance issues and bottlenecks in RAN, Core, and Transport.
• Develop and maintain performance dashboards and reports.
• Recommend and implement network optimization strategies.
• Collaborate with network engineers and operations teams on performance improvements.
• Conduct deep-dive analysis of network data to identify root causes of problems.
• Support the planning and deployment of new 5G features and services.
• Utilize network performance monitoring tools and techniques.
• Troubleshoot complex network performance issues.
• Stay abreast of latest 5G technologies and industry trends.
• Contribute to capacity planning and network evolution strategies.

• Bachelor's or Master's degree in Telecommunications Engineering, Computer Science, or a related field.
• Significant experience (5+ years) in mobile network performance analysis, specifically with 5G.
• In-depth knowledge of 5G NR, NSA/SA architecture, RAN, and Core network elements.
• Proficiency with network performance monitoring tools (e.g., TEMS, Nemo, Scala, Actix).
• Strong data analysis skills and experience with scripting languages (Python, R) for automation.
• Experience with drive testing and post-processing tools.
• Excellent problem-solving and analytical abilities.
• Strong communication and interpersonal skills.
• Ability to work effectively in a hybrid team environment.
• Understanding of QoS and QoE principles in mobile networks.

National Grid is at the heart of the UK energy network keeping people connected and society moving. We develop, own and maintain the physical infrastructure, such as pylons and cables needed to move the electricity generated from windfarms and power sources around the country. Every time a phone is plugged in, or a switch is turned on, we've played a part, connecting you to the electricity you need - and we're leading the transformation towards a greener future, dreaming bigger to bring a more affordable energy future to everyone.

But it's our people that provide our true superpower. They drive and sustain our growth, their unique differences only making us stronger. But it's no small feat – and we need the best to join us in our mission. So, join us and power the future of energy.

Network Operations & Intelligence (NOI) is responsible for running the Transmission Network Control Centre and planning the System Access (outages) that are a key requirement to enable Electricity Transmission (ET) to carry out all types of critical work to maintain safety and reliability. NOI also provides key insights and analysis of our network to internal and external stakeholders.

The Portfolio & Performance Team work with colleagues across the NGET business to identify and mitigate portfolio delivery risks, report progress against targets and drive business performance towards meeting and exceeding stakeholder commitments. This includes everything from maintenance activity up to a major clean power infrastructure project. We work with people across the business which is a fantastic way for a graduate to learn more about the business as a whole. Your placements will be largely up to you and where your interests lie – as well as our business need; you will have the opportunity to work in one of several areas including:

• Portfolio Deliverability are responsible for looking at our portfolio risk, managing the outage change control process, governing our planning process, and delivering improvements where needed.
• Business Performance set the annual contracts across NGET by agreeing targets with our executives and CEO team. Throughout the year they track key performance indicators and progress against milestones and critical outcomes to challenge the business and inform our executives.
• Portfolio Change Control conduct detailed analyses on our asset portfolios so that we can accurately report on their status both internally and externally. They own and manage the change control process where we justify to our regulator, Ofgem, why we have made changes to our plan – for example choosing to replace an asset instead of refurbishment due to a catastrophic fault.

As you'll be joining our 18-month graduate programme, you'll have a tailored development pathway to support you as you develop a wide range of leadership, business, and technical skills. You'll attend in-person and virtual development sessions throughout your programme to equip you with the essential skills required, as you begin your career at National Grid. We're committed to the personal development of our colleagues so as well as the support from your line manager as you navigate your new role, you'll also have access to 121 coaching and a mentor, from a previous cohort to help you transition from campus to corporate life.

All graduates complete the core development programme to develop key skills such as how to make an impact, giving feedback and presentation skills. Aligned to this role is our Engineering pathway and as part of this you'll develop further key technical skills aligned to your role as well as important learning modules such as working safely. If relevant to your career aspirations, you will be able to access Institution of Engineering and Technology (IET) membership and seek support from a National Grid IET mentor to help you secure your chartership.

We believe in the importance of getting as much on-the-job experience as possible and to do this, you will complete three 6-month placements, across the UK, designed to deepen your understanding of your speciality but to also broaden your knowledge of our business. At the end of your 18-month programme you'll return to your initial placement area to kickstart your superpowered career.

You'll need to achieve a minimum 2:2 in a Computer Science, Artificial Intelligence (AI), Engineering, Mathematics, Technology, Statistics or Data Analytics related degree. It doesn't matter when you graduated or if you are currently working towards your qualification. We just need you to be eager to apply your knowledge in a real-world setting.

You'll need flexibility to travel within role and throughout your rotations as required.

This role is based in National Grid House in Warwick and offers flexible hybrid working, where possible.

We are proud to offer a graduate starting salary of £36,640

Not only will you receive a tailored development programme to progress a superpowered career at National Grid, we also offer some great rewards and benefits too:

• £,000 bonus, once joined and started on programme
• 26 days holiday
• ,400 payment on successful completion of the programme
• Up to 00 per month accommodation allowance as you move around the business, and additional annual leave for when you move between placements plus assistance with moving personal belongings
• Other benefits include pension and share-option schemes, Flexible Benefits, close mentorship and regular feedback & volunteering opportunities.

You can only apply for one graduate opportunity during this recruitment cycle. We kindly ask that you review all our graduate opportunities and apply for the one that aligns closest with your aspirations and interests.

We recruit on a rolling basis and reserve the right to close our vacancies once we have enough applications/based on volume of applications. We encourage you to apply as early as possible to ensure you obtain the place you want in the application process.

Assessment centres will be held between November - April 2026

National Grid's Graduate & Student opportunities in the UK are open to all applicants who meet the eligibility criteria including an existing and valid right to work in the UK. As part of the application process this will need to be evidenced and verified before you can start the programme.

Please note that in most cases, National Grid is unable to offer sponsorship for employment under the UK points-based immigration system. As such, applicants must have the legal right to work in the UK without requiring sponsorship now or in the future under the UK points-based immigration system. However, in exceptional circumstances where there is a clear and demonstrable need for specialist skills that cannot be sourced from the local labour market, National Grid may consider offering sponsorship. All applications are welcome from candidates who meet these requirements, regardless of race, nationality, or ethnic origin.

Please be aware that it's your responsibility to explore avenues of working in the UK, as we're not able to provide advice on this. For information about visas please visit

At National Grid, it's our people that provide our true superpower. They drive and sustain our growth, their unique differences only making us stronger, so we pride ourselves on placing diversity, equity and inclusion at the heart of who we are and what we do and are committed to building a workforce of the future which represents the communities we serve. We welcome and encourage applicants with diverse experiences and backgrounds, and offer flexible and tailored support, at home and in the office where and when needed. All our offers are based on the right to work in the UK, qualifications, the innovation from creating diverse teams and perspectives, as well as business need.

Network & Infrastructure Engineer

Location: London / Hybrid

Salary: £40,000-£60,000

Overview

We are seeking an experienced Network & Infrastructure Engineer to design, implement, and support secure, scalable, and high-performing technology environments across our organisation.

This is an exciting opportunity to work at the cutting edge of Smart Building applications, IoT, IT/OT convergence to integrate building auto; HVAC, lighting, security and IoT with enterprise IT Systems.

This is a hybrid technical and stakeholder-facing role, combining hands-on engineering expertise with project delivery and business engagement skills. You’ll lead network and infrastructure initiatives end-to-end — from understanding user needs and translating them into technical designs, through to deployment, documentation, and optimisation.

The ideal candidate will have a strong grounding in network and security technologies, cloud infrastructure, and project management, with the ability to communicate effectively across technical and non-technical teams.

Key Responsibilities

Network & Infrastructure Design

• Design, deploy, and maintain network infrastructure including LAN/WAN, wireless, VPN, and firewalls.
• Configure and manage network segmentation, VLANs, and routing to support secure and efficient data flow.
• Oversee server, storage, and virtualisation environments (on-premise and/or cloud).
• Implement and maintain cloud connectivity and hybrid networking (Azure/AWS VPNs, ExpressRoute, etc.).

Security & Compliance

• Ensure network and infrastructure security align with organisational policies and standards (ISO27001, GDPR, etc.).
• Configure and monitor firewalls, intrusion detection/prevention systems, and endpoint security solutions.
• Support identity and access management, MFA, and secure network access policies.
• Conduct regular vulnerability assessments, patch management, and system hardening.

Project Management & Delivery

• Lead infrastructure and network projects from scoping through delivery, ensuring quality, cost, and time objectives are met.
• Define technical requirements and translate business needs into deliverable solutions.
• Develop and maintain project documentation including architecture diagrams, risk registers, and deployment guides.
• Manage vendors, suppliers, and third-party contractors to ensure aligned delivery outcomes.
• Apply structured project management methodologies (Agile, Prince2, or hybrid).

Stakeholder Engagement & Collaboration

• Act as a trusted advisor to internal teams and business units, gathering and translating technical requirements into actionable solutions.
• Collaborate closely with IT, Operations, Security, and external partners to ensure seamless integration and delivery.
• Communicate complex technical concepts in clear, non-technical language for diverse audiences.
• Provide updates and reports on project progress, risks, and mitigations to leadership and stakeholders.

Operations & Support

• Provide third-line support for network and infrastructure incidents and escalations.
• Monitor system performance and implement improvements to enhance reliability and scalability.
• Maintain detailed documentation of infrastructure, configurations, and changes.
• Participate in an on-call or escalation rota as required.

Qualifications & Experience

Essential:

• 5+ years’ experience in network and infrastructure engineering roles.
• Proven experience managing and delivering technical projects end-to-end.
• Strong knowledge of IP networking, routing, switching, VLANs, VPNs, and firewall configuration (Cisco, Fortinet, Palo Alto, etc.).
• Hands-on experience with cloud platforms (Microsoft Azure, AWS, or equivalent).
• Familiarity with Active Directory, Azure AD, DNS, DHCP, Group Policy, and M365 environments.
• Strong understanding of cybersecurity principles, access control, and encryption standards.
• Excellent communication, stakeholder engagement, and documentation skills.

Desirable:

• Relevant certifications (CCNA, CCNP, CompTIA Network+/Security+, Azure Administrator, etc.).
• Experience with infrastructure automation or scripting (PowerShell, Python).
• Knowledge of monitoring and observability tools (SolarWinds, PRTG, Grafana, etc.).
• Experience with ITIL practices and ServiceNow or equivalent ticketing systems.

Personal Attributes

• Technically curious, proactive, and solutions oriented.
• Confident engaging with technical and business stakeholders alike.
• Comfortable balancing hands-on technical work with structured project delivery.
• Strong organisational and time-management skills with a focus on quality and outcomes.

Why Join Us

• Be part of a forward-thinking technology function driving innovation and digital transformation.
• Work on diverse infrastructure and security projects with tangible business impact.
• Opportunities for ongoing professional development and certification.
• Supportive and collaborative environment where technical excellence is valued.

Network & Infrastructure Engineer

Location: London / Hybrid

Salary: £40,000-£60,000

Overview

We are seeking an experienced Network & Infrastructure Engineer to design, implement, and support secure, scalable, and high-performing technology environments across our organisation.

This is an exciting opportunity to work at the cutting edge of Smart Building applications, IoT, IT/OT convergence to integrate building auto; HVAC, lighting, security and IoT with enterprise IT Systems.

This is a hybrid technical and stakeholder-facing role, combining hands-on engineering expertise with project delivery and business engagement skills. You’ll lead network and infrastructure initiatives end-to-end — from understanding user needs and translating them into technical designs, through to deployment, documentation, and optimisation.

The ideal candidate will have a strong grounding in network and security technologies, cloud infrastructure, and project management, with the ability to communicate effectively across technical and non-technical teams.

Key Responsibilities

Network & Infrastructure Design

• Design, deploy, and maintain network infrastructure including LAN/WAN, wireless, VPN, and firewalls.
• Configure and manage network segmentation, VLANs, and routing to support secure and efficient data flow.
• Oversee server, storage, and virtualisation environments (on-premise and/or cloud).
• Implement and maintain cloud connectivity and hybrid networking (Azure/AWS VPNs, ExpressRoute, etc.).

Security & Compliance

• Ensure network and infrastructure security align with organisational policies and standards (ISO27001, GDPR, etc.).
• Configure and monitor firewalls, intrusion detection/prevention systems, and endpoint security solutions.
• Support identity and access management, MFA, and secure network access policies.
• Conduct regular vulnerability assessments, patch management, and system hardening.

Project Management & Delivery

• Lead infrastructure and network projects from scoping through delivery, ensuring quality, cost, and time objectives are met.
• Define technical requirements and translate business needs into deliverable solutions.
• Develop and maintain project documentation including architecture diagrams, risk registers, and deployment guides.
• Manage vendors, suppliers, and third-party contractors to ensure aligned delivery outcomes.
• Apply structured project management methodologies (Agile, Prince2, or hybrid).

Stakeholder Engagement & Collaboration

• Act as a trusted advisor to internal teams and business units, gathering and translating technical requirements into actionable solutions.
• Collaborate closely with IT, Operations, Security, and external partners to ensure seamless integration and delivery.
• Communicate complex technical concepts in clear, non-technical language for diverse audiences.
• Provide updates and reports on project progress, risks, and mitigations to leadership and stakeholders.

Operations & Support

• Provide third-line support for network and infrastructure incidents and escalations.
• Monitor system performance and implement improvements to enhance reliability and scalability.
• Maintain detailed documentation of infrastructure, configurations, and changes.
• Participate in an on-call or escalation rota as required.

Qualifications & Experience

Essential:

• 5+ years’ experience in network and infrastructure engineering roles.
• Proven experience managing and delivering technical projects end-to-end.
• Strong knowledge of IP networking, routing, switching, VLANs, VPNs, and firewall configuration (Cisco, Fortinet, Palo Alto, etc.).
• Hands-on experience with cloud platforms (Microsoft Azure, AWS, or equivalent).
• Familiarity with Active Directory, Azure AD, DNS, DHCP, Group Policy, and M365 environments.
• Strong understanding of cybersecurity principles, access control, and encryption standards.
• Excellent communication, stakeholder engagement, and documentation skills.

Desirable:

• Relevant certifications (CCNA, CCNP, CompTIA Network+/Security+, Azure Administrator, etc.).
• Experience with infrastructure automation or scripting (PowerShell, Python).
• Knowledge of monitoring and observability tools (SolarWinds, PRTG, Grafana, etc.).
• Experience with ITIL practices and ServiceNow or equivalent ticketing systems.

Personal Attributes

• Technically curious, proactive, and solutions oriented.
• Confident engaging with technical and business stakeholders alike.
• Comfortable balancing hands-on technical work with structured project delivery.
• Strong organisational and time-management skills with a focus on quality and outcomes.

Why Join Us

• Be part of a forward-thinking technology function driving innovation and digital transformation.
• Work on diverse infrastructure and security projects with tangible business impact.
• Opportunities for ongoing professional development and certification.
• Supportive and collaborative environment where technical excellence is valued.

Your new company
Join a forward-thinking public sector organisation committed to delivering innovative ICT solutions across Scotland. The company fosters a collaborative and inclusive culture, driving transformation and excellence in digital infrastructure.
Your new role
As a Network Engineer, you'll lead a high-performing technical team responsible for designing, building, and maintaining core ICT infrastructure. You'll play a key role in shaping strategic direction, solving complex problems, and ensuring the reliability and security of enterprise-wide systems across cloud, network, and communications platforms. The role offers flexibility to work from various ICT locations across Scotland, subject to availability.
What you'll need to succeed
Essential Qualifications & Experience:- Degree or relevant industry certification (e.g. Cisco CCIE) or extensive experience in a similar role.
- Proven expertise in ICT infrastructure support, including cloud, security, telephony, WAN/LAN, and remote access.
- Strong understanding of ICT automation tools and network security. - Experience with identity management systems (e.g. Active Directory, Azure AD, Radius).Essential Personal Qualities:- Ability to lead engineering teams without direct line management.
- Excellent communication and stakeholder engagement skills.
- Strong problem-solving capabilities under pressure.
- Adaptability and attention to detail.
- Experience managing enterprise-level infrastructure services.
Desirable:- ITIL Foundation Certificate.
- Experience supporting a live network across 500+ sites and 24,000+ users.
What you'll get in return - A dynamic and collaborative working environment.
- Opportunity to influence strategic ICT direction.
- Competitive Day Rate
- Exposure to cutting-edge technologies and transformation programmes.
- Flexible working location across Scotland's ICT hubs.
- Participation in a senior on-call rota and potential to deputise for the Infrastructure Manager.

What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you but you are looking for a new position, please contact us for a confidential discussion on your career.

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Location:
Taunton (Hybrid, with potential for remote)

Clearance:
SC Cleared

Duration:
3 Months (Initial)

Day Rate:
£325

We're seeking an experienc
ed
Network & Firewall Engineer to join on a 3-month contract, supporting the delivery of secure, high-performance connectivity and resilience across a large enterprise environment.

This is a senior technical role where you'll act as the go-to authority on networking and firewall technologies, shaping and guiding the organisation's infrastructure strategy while also remaining hands-on in delivery.

What you'll be doing

• Leading on the design, configuration, and management of enterprise network infrastructure (LAN, WAN, VPN, SD-WAN).
• Overseeing firewall policies and network security zones (Cisco, Fortinet, Palo Alto or similar).
• Monitoring performance, resolving incidents, and ensuring service resilience.
• Supporting digital transformation projects by providing expert technical input.
• Mentoring and guiding engineers, setting standards, and driving best practices.

What we're looking for

• SC Cleared
  and available at short notice.
• Cisco CCNP-level knowledge and experience.
• Proven track record leading on enterprise networking and firewall management.
• Strong hands-on skills with network monitoring and diagnostic tools.
• Ability to influence and collaborate across technical teams and stakeholders.

Full Time, Permanent

The closing date for applications is 23.59 on 3rd October 2025

Interviews will be held: w/c 20th October

The University of Reading is an exciting and vibrant place to work where there are opportunities to get involved with a wide variety of work, from corporate systems to high profile research groups, and from the museums and archives to a working farm. The University offers a generous holiday allowance of 26 standard leave entitlement, 8 bank holiday and 6 closure days. We will provide a flexible, friendly working environment, good annual leave provision, training opportunities and the chance to work in an environment with a wide variety of challenges.

The Connectivity Team within Digital Technology Services (DTS) oversee the delivery and management of all secure, reliable and scalable network solutions across the campus infrastructure forming the foundation for all IT services across the University.

We are looking for a Network Engineer to join the team and help support the current infrastructure and assist in the delivery of our new network based on Juniper's IP-CLOS topology underpinned by Juniper Mist AI. Working with modern technology at an enterprise scale, this is a rare opportunity to learn and make a difference to the customers of the network

You must have the following to be considered for the role:

• Experience of working with network equipment at the edge, distribution and core.
• Associate Level certification or equivalent experience
• Knowledge of Network Access Control (NAC) products
• Experience of working with enterprise Wi-Fi

In addition, you should be able to:

• Demonstrate good working practices in a technical support environment.
• Experience of working within IT Service Management frameworks such as ITIL

You will have :

• Solid experience of working with enterprise networks
• Associate Level certification or equivalent experience
• Solid understanding of wireless networks and RF fundamentals
• Able to work on-site

The University is committed to having a diverse and inclusive workforce, supports the gender equality Athena SWAN Charter and the Race Equality Charter, and champions LGBT+ equality. We are a Disability Confident Employer (Level 2). Applications for job-share, part-time and flexible working arrangements are welcomed and will be considered in line with business needs.