2,170 Network Administrators jobs in the United Kingdom

Network Security Engineer

London, London SR2 | Socially Responsible Recruitment | Certified B Corporation™

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Network Security Engineer Network Security / Penetration Testing / CREST / CSTL / API Testing / Config Reviews / Infrastructure / Outside IR35 / West London We’re seeking an experienced Network Security Engineer to support a major multi-phase security testing project. You’ll conduct penetration tests, configuration reviews, and infrastructure assessments, contributing to a high-profile programme of work extending into next year. Required Strong background in network and infrastructure security. Experience performing penetration testing, configuration reviews, and API testing. Knowledge of “classic” CHECK-style testing methodologies. CREST, CSTL or CTL certification (Team Member or Team Leader level). Ability to deliver high-quality reports and communicate technical findings clearly. Hands-on experience across infrastructure, networking, and external testing. Desirable Experience working within CHECK or other accredited testing schemes. Strong understanding of secure network architecture and hardening practices. Previous consultancy or project-based testing experience. Contract Details Outside IR35 West London (on-site presence required for majority of testing) 0-hours contract – project-based work, phase by phase Initial phase focused on network testing, with further phases planned into next year Day Rate: Competitive Start: ASAP 1-Stage Interview Process with consultancy SME Please apply now or contact me directly if this role looks like a good fit. From there I’ll be in touch to discuss the opportunity in more detail. Network Security / Penetration Testing / CREST / CSTL / CTL / API Testing / Config Reviews / Infrastructure / Outside IR35 / West London
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Network Security Engineer

Dartford, South East Cognizant

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This is an excellent opportunity for Network Security Engineer professionals to be part of leading-edge technology projects. Cognizant's Cloud, Infrastructure & Security Services Practice provides end-to-end solutions covering architecture, design, implementation, management, and on-going support across the entire enterprise technology infrastructure. Our services include a spectrum of management, consulting, and systems integration services to help our clients maximize value in their infrastructure resources, while optimizing infrastructure performance and cost.
**Key Responsibilities** :
+ Design, configure, and support scalable and secure enterprise network architectures across hybrid environments (on-premises and AWS Cloud).
+ Implement and manage Cisco switching technologies and ensure optimal network performance and redundancy.
+ Configure and maintain Palo Alto Networks Firewalls (both physical and virtual), ensuring proper security policies and compliance.
+ Administer and optimize dynamic routing protocols such as OSPF and BGP for efficient network traffic flow.
+ Manage AWS networking components, including Transit Gateways, VPC Attachments, Security Groups, Endpoints, GWLB, ALB, NLB, and WAF.
+ Provide technical leadership in wireless technologies and oversee deployments using Meraki products.
+ Identify and implement automation opportunities to reduce manual intervention and operational overhead in collaboration with automation teams.
+ Troubleshoot complex network issues through strong analytical and logical reasoning skills to ensure minimum downtime.
+ Develop, update, and maintain detailed network documentation, architecture diagrams, and configuration standards.
+ Collaborate with cross-functional teams to support network integration, security, and performance initiatives.
**Required Skills**
+ Solid foundation in core networking concepts including TCP/IP, VLANs, DNS, DHCP, and subnetting.
+ Hands-on proficiency in Cisco Switching Technologies (Must).
+ Expertise in Palo Alto Networks Firewalls (Must).
+ Strong knowledge of Dynamic Routing Protocols - OSPF, BGP.
+ Extensive experience in AWS Networking - Transit Gateways, ALB/NLB, Security Groups, Endpoints, GWLB, WAF (Must).
+ Strong understanding of Wireless Networking, with hands-on experience using Meraki products.
+ Excellent logical thinking and troubleshooting skills to resolve complex technical issues (Must).
+ Proven automation skills to identify network improvement opportunities (Must).
+ Certifications preferred: CCNP, AWS Certified Advanced Networking, PCNSE (Palo Alto), or equivalent.
At Cognizant you will experience an exciting mix of innovation by design, creativity, collaboration, and efficiency within a framework of stimulating objectives and a passion for delivering the best to our customers.
You will be joining a network of some of the most creative, innovative, and dedicated people in the industry with ample opportunities to learn and develop your career.
Our Associates are chosen for their attitude, skills, knowledge, and enthusiasm but above all, their belief that anything is possible.
Cognizant is an equal opportunities employer, and we welcome all applications regardless of race, colour, gender, ethnic origin, nationality, religion or beliefs, disability, age, sexual orientation, political opinions, or trade union membership.
Cognizant is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected Veteran status, age, or any other characteristic protected by law.
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Network Security Engineer

London, London Meta

Posted 1 day ago

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**Summary:**
Meta's Network Security team is seeking an experienced engineer to help secure our global Data Centers, network Backbone, Optical Infrastructure, and Edge PoPs. We do this by working extensively across the Meta family of products, including Instagram, WhatsApp, and AI where we identify and solve security problems across network infrastructure. You will be responsible for building, implementing, and operationally supporting the organization to develop security controls and services that will protect network infrastructure which helps serve traffic for over 3 billion users worldwide. We are looking for engineers with experience in managing complex issues that require problem-solving to drive security and innovation, who will research and develop new solutions to help protect our infrastructure and our users through a defense in-depth approach. The team thrives in finding security issues and eradicating them and makes life hard for bad actors. With focuses that range from large scale Distributed Denial of Service (DDoS), routing security, security tool development, defense against internal and external attacks there's lots of room to push your skill set in deploying network security controls at scale.
**Required Skills:**
Network Security Engineer Responsibilities:
1. Identifying risks across network infrastructure that would lead to the exposure of sensitive data, unauthorized access, or loss of availability and prioritizing remediation efforts to address gaps
2. Influence security direction of the network, including management software and infrastructure to protect the network integrity of Meta platforms
3. Conceptualize and lead efforts towards building sustainable and scalable network layer security controls and tooling
4. Mentor and champion security practices through cross functional work with engineering teams throughout Meta
5. Keep Meta's safe through active operation and defense of critical network infrastructure
**Minimum Qualifications:**
Minimum Qualifications:
6. Engineering degree, or a related technical discipline, or equivalent work experience
7. Experience coding in higher-level languages (e.g. Python, Rust, Go, C++)
8. Experience in configuration and maintenance of network platforms such as firewalls, routers, switches, load balancers, and proxies
9. Experience learning software, frameworks and APIs
**Preferred Qualifications:**
Preferred Qualifications:
10. Understanding of implementation and scaling of access controls across both host and network layers.
11. Understanding of threat models to better protect against attacks or detect new vectors.
12. Experience leading network efforts to investigate, prevent, and mitigate security incidents.
13. Experience evaluating and testing new vendor platforms and in house network initiatives for security issues.
14. Experience leveraging layered security models to defend critical network infrastructure.
**Industry:** Internet
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Network Security Engineer

London, London SR2 | Socially Responsible Recruitment | Certified B Corporation™

Posted 4 days ago

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Network Security Engineer

Network Security / Penetration Testing / CREST / CSTL / API Testing / Config Reviews / Infrastructure / Outside IR35 / West London

We’re seeking an experienced Network Security Engineer to support a major multi-phase security testing project. You’ll conduct penetration tests, configuration reviews, and infrastructure assessments, contributing to a high-profile programme of work extending into next year.

Required
  • Strong background in network and infrastructure security.
  • Experience performing penetration testing, configuration reviews, and API testing.
  • Knowledge of “classic” CHECK-style testing methodologies.
  • CREST, CSTL or CTL certification (Team Member or Team Leader level).
  • Ability to deliver high-quality reports and communicate technical findings clearly.
  • Hands-on experience across infrastructure, networking, and external testing.
Desirable
  • Experience working within CHECK or other accredited testing schemes.
  • Strong understanding of secure network architecture and hardening practices.
  • Previous consultancy or project-based testing experience.
Contract Details
  • Outside IR35
  • West London (on-site presence required for majority of testing)
  • 0-hours contract – project-based work, phase by phase
  • Initial phase focused on network testing, with further phases planned into next year
  • Day Rate: Competitive
  • Start: ASAP
  • 1-Stage Interview Process with consultancy SME
Please apply now or contact me directly if this role looks like a good fit. From there I’ll be in touch to discuss the opportunity in more detail.

Network Security / Penetration Testing / CREST / CSTL / CTL / API Testing / Config Reviews / Infrastructure / Outside IR35 / West London
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Network Security Engineer

SO14 1AA Southampton, South East £60000 Annually WhatJobs

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full-time
Our client is seeking a skilled and experienced Network Security Engineer to join their IT infrastructure team based in **Southampton, Hampshire, UK**. This role is critical in safeguarding the company's network and data against evolving cyber threats. You will be responsible for designing, implementing, and maintaining robust security solutions, ensuring the integrity, confidentiality, and availability of network resources. Key duties include configuring and managing firewalls, intrusion detection/prevention systems (IDPS), VPNs, and other security appliances. You will also monitor network traffic for suspicious activity, conduct vulnerability assessments, and perform regular security audits.

The ideal candidate will possess a strong understanding of network protocols, security best practices, and industry-standard security technologies. Proven experience in incident response, threat analysis, and developing security policies and procedures is essential. Certifications such as CISSP, CCNA Security, or equivalent are highly desirable. You will collaborate closely with IT teams to troubleshoot security issues, implement security patches, and ensure compliance with regulatory requirements. A proactive approach to identifying and mitigating potential security risks is crucial. Excellent analytical and problem-solving skills, coupled with strong communication abilities, will enable you to effectively convey technical information to both technical and non-technical stakeholders.

This is an excellent opportunity to join a reputable organisation and contribute to its cybersecurity posture. The role offers a competitive salary, comprehensive benefits, and the chance to work with a dedicated team. You will be instrumental in protecting sensitive information and maintaining the operational continuity of the business. This hybrid role offers a balance between in-office collaboration and remote flexibility, fostering a productive work environment.
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Network Security Engineer

B1 1BB Birmingham, West Midlands £58000 Annually WhatJobs

Posted 3 days ago

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full-time
Our client, a rapidly growing telecommunications provider committed to delivering secure and reliable network solutions, is seeking a skilled Network Security Engineer to join their dynamic team based in **Birmingham, West Midlands, UK**. This role is critical in protecting the company's network infrastructure and data from cyber threats. You will be responsible for designing, implementing, and maintaining robust security measures across the company's network. This includes firewalls, intrusion detection/prevention systems (IDS/IPS), VPNs, and other security technologies. You will monitor network traffic for security breaches and respond to incidents in a timely and effective manner. Conducting regular security audits, vulnerability assessments, and penetration testing to identify and mitigate risks will be a primary duty. Developing and enforcing security policies, standards, and procedures to ensure compliance with industry best practices and regulatory requirements is essential. You will also be involved in the configuration and management of network access controls and authentication systems. Collaborating with IT operations and other teams to integrate security measures into the overall network architecture is key. Staying abreast of the latest cybersecurity threats, trends, and technologies to proactively adapt and enhance security protocols is crucial. Providing technical expertise and guidance on security-related matters to colleagues will be expected. Experience with cloud security platforms (AWS, Azure, GCP) is highly desirable. You should have a strong understanding of TCP/IP, routing protocols, and network infrastructure. Certifications such as CISSP, CCNA Security, or equivalent are strongly preferred. A minimum of 4 years of experience in network security engineering or a similar role is required. A Bachelor's degree in Computer Science, Information Technology, Cybersecurity, or a related field is essential. This is a hybrid role, requiring a balance of remote work and in-office presence for collaboration and essential tasks at our client's **Birmingham** office. Occasional on-call duties may be required.
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Network Security Engineer

G1 1AA Glasgow, Scotland £60000 Annually WhatJobs

Posted 6 days ago

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full-time
Our client, a leading telecommunications provider, is seeking a highly skilled and experienced Network Security Engineer to join their dedicated IT infrastructure team. This role is crucial for safeguarding the company's network against evolving cyber threats. You will be responsible for designing, implementing, and maintaining robust security measures to protect our client's network, systems, and data. The ideal candidate possesses a strong understanding of network protocols, security principles, and threat mitigation techniques.

Responsibilities:
  • Design, implement, and manage network security solutions, including firewalls, VPNs, intrusion detection/prevention systems (IDS/IPS), and endpoint security.
  • Monitor network traffic for security breaches and suspicious activities, responding promptly to incidents.
  • Conduct regular vulnerability assessments and penetration testing to identify and address security weaknesses.
  • Develop and maintain security policies, procedures, and documentation.
  • Collaborate with network operations teams to ensure secure network configurations and deployments.
  • Stay current with the latest security threats, trends, and technologies, proactively recommending enhancements to security posture.
  • Provide expert guidance on security best practices to internal stakeholders.
  • Respond to and investigate security incidents, performing root cause analysis and implementing corrective actions.
  • Manage security-related vendor relationships and evaluate new security products and technologies.
  • Ensure compliance with relevant security standards and regulations.
Qualifications:
  • Bachelor's degree in Computer Science, Information Technology, Cybersecurity, or a related field.
  • Minimum of 5 years of experience in network security engineering or a similar role.
  • Strong understanding of TCP/IP, routing protocols (e.g., BGP, OSPF), and network architecture.
  • Hands-on experience with security technologies such as firewalls (Palo Alto, Cisco ASA), VPNs, IDS/IPS, SIEM solutions.
  • Knowledge of common cybersecurity frameworks (e.g., NIST, ISO 27001).
  • Relevant certifications such as CISSP, CCNA Security, CCNP Security, or similar are highly desirable.
  • Excellent problem-solving and analytical skills.
  • Strong communication and interpersonal skills, with the ability to explain technical concepts to non-technical audiences.
  • Ability to work effectively under pressure and manage multiple priorities.
This is an on-site position based in Glasgow, Scotland, UK , offering a stable and challenging career within the dynamic telecommunications industry.
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Network Security Engineer

LE1 5DG Leicester, East Midlands £50000 Annually WhatJobs

Posted 6 days ago

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full-time
Our client, a prominent entity in the Telecoms sector, is looking for a skilled Network Security Engineer to join their team in **Leicester, Leicestershire, UK**. This hybrid role offers a dynamic work environment, combining essential in-office collaboration with the flexibility of remote work. You will be responsible for designing, implementing, and maintaining robust network security solutions to protect the company's infrastructure and data. This role requires a deep understanding of network protocols, security technologies, and threat mitigation strategies. You will play a crucial part in safeguarding our client's network against cyber threats and ensuring service continuity. Key Responsibilities:
  • Designing, implementing, and managing network security solutions, including firewalls, Intrusion Detection/Prevention Systems (IDPS), VPNs, and access control systems.
  • Monitoring network traffic for security breaches and suspicious activities.
  • Responding to security incidents, performing forensic analysis, and implementing containment and eradication measures.
  • Conducting vulnerability assessments and penetration testing.
  • Developing and enforcing network security policies and procedures.
  • Collaborating with IT teams to ensure network security is integrated into all aspects of infrastructure design and deployment.
  • Staying up-to-date with the latest security threats, vulnerabilities, and technologies.
  • Providing technical guidance and support on network security best practices.
  • Participating in security awareness training for employees.
  • Maintaining security documentation and incident logs.
The ideal candidate will hold a Bachelor's degree in Computer Science, Information Technology, or a related field, with relevant industry certifications (e.g., CISSP, CCNA Security). A minimum of 4 years of experience in network security is required. Strong knowledge of TCP/IP, routing protocols, and various security technologies is essential. Excellent analytical, problem-solving, and communication skills are necessary for this role. You will be expected to contribute to a culture of security excellence, working collaboratively to protect critical infrastructure.
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Network Security Engineer

BD1 1AA Bradford, Yorkshire and the Humber £50000 Annually WhatJobs

Posted 6 days ago

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full-time
Our client is seeking a skilled Network Security Engineer to join their established team in Bradford, West Yorkshire, UK . This is a critical role focused on safeguarding the company's network infrastructure against evolving cyber threats. You will be responsible for designing, implementing, and maintaining robust security solutions, including firewalls, intrusion detection/prevention systems, VPNs, and access control mechanisms. The successful candidate will possess a deep understanding of network protocols, security best practices, and threat mitigation strategies. You will conduct regular security audits, vulnerability assessments, and penetration tests to identify and address potential weaknesses. Furthermore, you will play a key part in developing and executing incident response plans, ensuring rapid and effective containment of security breaches.

Key Responsibilities:
  • Design, implement, and manage network security infrastructure, including firewalls, routers, switches, IDS/IPS, and VPNs.
  • Monitor network traffic for security breaches and suspicious activities, utilizing SIEM tools and other security monitoring solutions.
  • Perform regular vulnerability assessments and penetration testing to identify security risks.
  • Develop and maintain security policies, standards, and procedures.
  • Respond to and investigate security incidents, coordinating remediation efforts and providing post-incident analysis.
  • Configure and maintain security systems, ensuring they are up-to-date with the latest patches and threat intelligence.
  • Collaborate with IT teams to ensure security is integrated into all aspects of the network infrastructure.
  • Provide technical guidance and support on security-related matters to colleagues.
  • Stay informed about the latest security threats, trends, and technologies.
  • Contribute to security awareness training for staff.
Qualifications:
  • Bachelor's degree in Computer Science, Information Security, or a related field, or equivalent practical experience.
  • Minimum of 4 years of experience in network security engineering.
  • Strong knowledge of TCP/IP, routing protocols (BGP, OSPF), and network security technologies (e.g., Palo Alto, Cisco ASA, Fortinet).
  • Hands-on experience with IDS/IPS, SIEM solutions (e.g., Splunk, QRadar), and endpoint security tools.
  • Familiarity with security frameworks and compliance standards (e.g., ISO 27001, NIST).
  • Relevant security certifications such as CISSP, CCNA Security, or CompTIA Security+ are highly desirable.
  • Excellent analytical and problem-solving skills.
  • Strong communication and interpersonal skills, with the ability to explain complex technical issues to both technical and non-technical audiences.
  • Ability to work effectively under pressure and manage multiple priorities.
  • Must be able to work on-site in Bradford .
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Network Security Engineer

CB2 1AA Cambridge, Eastern £60000 Annually WhatJobs

Posted 6 days ago

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full-time
Our client, a leader in the telecommunications sector, is looking for a skilled Network Security Engineer to join their team. This role is crucial for safeguarding our network infrastructure against cyber threats and ensuring the integrity and availability of our communication services. You will be responsible for designing, implementing, and maintaining robust network security solutions. This includes configuring and managing firewalls, intrusion detection/prevention systems (IDS/IPS), VPNs, and other security appliances. You will conduct regular security assessments, vulnerability scans, and penetration testing to identify and mitigate potential risks. Developing and enforcing network security policies and procedures to ensure compliance with industry standards and best practices is essential. You will also play a key role in incident response, investigating security breaches, and implementing corrective actions to prevent future occurrences. Collaborating with IT and operations teams to integrate security measures into new network deployments and upgrades is a core responsibility. Monitoring network traffic for suspicious activity and analysing security logs to detect and respond to threats will be part of your daily duties. Staying up-to-date with the latest security threats, vulnerabilities, and technologies is paramount. Experience with cloud security principles (e.g., AWS, Azure) and knowledge of scripting languages (e.g., Python) for automation are highly desirable. Relevant security certifications such as CISSP, CCNA Security, or GIAC are a significant advantage. This role, based in **Cambridge, Cambridgeshire, UK**, offers a hybrid working model, combining the benefits of collaborative office-based work with remote flexibility. We are seeking a proactive, detail-oriented individual with excellent analytical and problem-solving skills and a strong commitment to network security. If you are a seasoned security professional looking for a challenging and impactful role in the fast-paced telecom industry, we encourage you to apply.
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