Network Security Specialist

Virgin Media Business Ireland; Amsterdam; On-site; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Competitive salary + Bonus

25 days annual leave

LinkedIn Learning & Coursera access

Company Pension Contributions

Calm premium subscription (NL only)

Job summary

Virgin Media Business Ireland is seeking a senior security professional to protect Liberty Global’s tier-1 network. You will drive network hygiene, monitor security controls, and collaborate with global teams to implement best practices across ISP networks.

You will translate complex findings into risk-aware recommendations, mentor engineers, and support incident response with strong expertise in BGP, DDoS mitigation, and security analytics.

Qualifications

• Solid grasp of Networking, Security and Monitoring.
• Experience and expertise in securing large (ISP) networks.
• Familiarity with BCP38/84, RPKI, BGP routing controls and DNS/DNSSEC.
• Experience with incident response and presenting findings to teams.

Responsibilities

• Serve as an authority on Internet security topics like Network Hygiene, MANRS, DDoS mitigation, and BGP routing.
• Identify sources of BGP hijacks, leaks, and abuse traffic; translate findings into actionable risk insights.
• Collaborate with Global Security Operations Centre and external teams to set priorities for maximum security impact.
• Develop and hand over monitoring use cases and runbooks to incident response teams.

Skills

Networking

Security

Monitoring

BGP routing

DDoS mitigation

Threat analytics

English fluency

Tools

Arbor threat mitigation suite

Splunk

Grafana

Elastic Stack

Job description

ABOUT US

We’re building Tomorrow’s Connections Today, bringing people together through the power of our technology. Liberty Global is a world leader in converged broadband, video and mobile communications and an active investor in cutting-edge infrastructure, content and technology ventures. With our investments in fibre-based and 5G networks we play a vital role in society, currently providing over 85 million fixed and mobile connections and rolling out the next generation of products and services, while readying our networks for 10 Gbps and beyond. We’re creating national champions, combining the best broadband and mobile networks under brands such as Virgin Media-02 in the UK, VodafoneZiggo in The Netherlands, Telenet in Belgium, Sunrise in Switzerland, Virgin Media in Ireland and UPC in Slovakia. Liberty Global Ventures, our global investment arm, has a portfolio of more than 75 companies and funds across content, technology and infrastructure, including strategic stakes in ITV, Univision, Plume, Lionsgate and the Formula E racing series. Our scale enables us to transfer knowledge and expertise across our operations and investments, creating a dynamic family of brands united in the pursuit of innovation and excellence. And we’re prioritising diversity, equity and inclusion in our workplace and communities, while reducing our impact on the environment. We are using technology as a force for good; for our people, our partners and the planet.

JOB PURPOSE

You will assure that our core and global tier-1 network has sound and industry best practice security protection and that the security of these products are monitored. The role will work closely together with Liberty Global core network architects, engineering and operational and global security teams to identify improvements and drive Network Hygiene security improvements and provide specialized skills in case of investigations. The role includes the ability to translate security findings or deficiencies to security risks and advise the organization on blocking issues and acceptable risk. Identify and drive improvements on Network Security on the tier-1 core network of Liberty Global. Identify and advise our ISP networks to implement similar security measures and monitoring. Review and generate technical specifications/documentation Translate, create, and hand over network monitoring use cases and tread play books to incident response teams Act as a mentor, technical lead and escalation point for other engineers Monitor and respond to incidents

KEY ACCOUNTABILITIES

Serve as an authority on Internet security related questions on topics like Network Hygiene, MANRS, DDoS mitigation, BGP routing and traffic analysis. Trace and identify sources of BGP hijacks, BGP leaks, DDoS, malware or other abuse traffic Review and update/improve security requirements set in policies/guidelines and make sure that these are following industry best practice. Identify potential areas of improvement and drive implementation. Liaise with the Global Security Operations Centre, LG and external operational teams and other Business units to have the right priorities set for maximum effect. Work with and understand deliverables of external bodies like M3AAWG, CableLabs, RIPE, and other security and standards organizations to assure Liberty Global networks and services follow industry Best Practice regarding Security areas. We tend to look for people with: Solid grasp of Networking, Security and Monitoring Experience and expertise in securing and protecting large (ISP) networks. Familiarity with network hygiene measures such as BCP38/84 anti-spoofing protection, RPKI, and other BGP routing BCPs, RIRs, and Internet Routing Registries, DNS/DNSSEC, and domain registration. Strong grasp of network security vulnerabilities and protections like: Denial of Service attacks and mitigation, BGP Hijacking, CoPP, access-lists, Tacacs, Spam/malware/abuse. Experience in presenting findings and making recommendations to other operational teams. Experience in working with many collaborators to improve security and incident response both internal and external in an international community. Demonstrated ability in an ISP environment and Internet security arena. Experience with Internet organizations like RIR's and domain name registries and tools like whois/RDAP, RIPE RIS, BGP and DNS monitoring. RIPE NCC certification (Database/BGP security) is a plus. Solid understanding of network security, security monitoring, and layers of defense principles.

SKILLS & ABILITIES

Fluency in English (speaking/writing) Superb communication skills Extensive knowledge or interest of at least 4 of the following areas: Networking, TCP/IP, IPv4/IPv6 and main services used by applications BGP, RPKI, Control Plane Policing (CoPP), DNS/DNSSEC Protection against DOS attacks, amplification factors and mitigation techniques Security analytics capabilities Experience with monitoring and analytics solutions (e.g. Arbor threat mitigation suite, Splunk, Grafana, Elastic Stack etc…) Basic scripting/programming/database skills. A great teammate, able to prioritise effectively and work independently well under pressure. Working with internal / external working groups to support improving network security and reduce impact of Denial of Service attack factors or other service disruptive activities in our footprint.

Some of the benefits we offer

• Competitive salary + Bonus
• 25 days annual leave with the option to purchase 5 more
• Free access to LinkedIn Learning & Coursera to continue to develop and grow your career with us
• Company Pension Contributions
• Free premium subscription to Calm – a renowned well-being & meditation app (NL only)
• Free public transport subscription that can be used for both work and leisure travel on all modes of public transport, anywhere in the Netherlands
• Subsidy on health insurance premium
• Company Laptop, Mobile and Phone Subscription

Liberty Global is an equal opportunity employer. We embrace diversity and are committed to creating an inclusive environment for our people. We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process. We’re 100% committed to having a workforce that represents every part of our society. So we’re keen to hear from candidates of all background and circumstances.

Our Story

We’re building Tomorrow’s Connections Today. Liberty Global is a leading international converged connectivity and investment company focused on creating sustainable, long-term value for customers, employees and shareholders through the strategic management of three platforms — Liberty Telecom, Liberty Growth and Liberty Services. Liberty Telecom is a world leader in converged broadband, video and mobile communications services, delivering next-generation products through advanced fibre and 5G networks. It currently provides approximately 80 million connections through some of Europe’s best-known consumer brands, including Virgin Media-02 in the UK, VodafoneZiggo in The Netherlands, Telenet in Belgium and Virgin Media in Ireland. With our substantial scale and commitment to innovation, we are building Tomorrow’s Connections Today, investing in the infrastructure and platforms that empower our customers to make the most of the digital revolution, while deploying the advanced technologies that nations and economies need to thrive. Liberty Growth invests, grows and rotates capital into scalable businesses across the technology, media/content, sports and infrastructure industries with a portfolio of approximately 70 companies and various funds, including stakes in companies like ITV, Televisa Univision, Plume, EdgeConneX and AtlasEdge, as well as our controlling interest in the Formula E racing series. Liberty Services delivers innovative technology and finance services, generating approximately $600 million in revenue. Our scale enables us to transfer knowledge and expertise across our operations and investments, creating a dynamic family of brands united in the pursuit of innovation and excellence, with a commitment to building a culture where everyone feels they belong. And we’re prioritizing diversity, equity and inclusion in our workplace and communities, while reducing our impact on the environment. We are using technology as a force for good; for our people, our partners and the planet.

OUR FUTURE OUTLOOK IS EXCITING, TOGETHER

Privacy Policy

The data included in the candidate account (eg. your name, e-mail address and CV; hereafter collectively “your data”) will be processed by Liberty Global as the Controller for the purposes of candidate selection, placement and employment. Your data can also be shared with Liberty Global plc and/or its majority owned subsidiaries (collectively, the “Liberty Global Group”, “we” or “us”) and third party organizations providing recruitment, selection, placement and employment services. Such third parties will use candidate information only in connection with such services, and applicable law. Your data will be retained for the period of up to 1 year after closing the selection process, after which it will be deleted. You have: the right to access your data or ask for a copy of the personal data that we hold about you and, if such personal data is inaccurate or incomplete, to request the rectification, erasure or blocking of such personal data. You have the right to object to the processing; and the right to lodge a complaint at a supervisory authority or a court of law in accordance with applicable laws. If you wish to exercise your privacy rights or if you have any questions about our use of your data or about your privacy rights please contact: [e-mail]