Network Security Architect - Core & DDoS Defense

Liberty Global; Amsterdam; On-site; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Annual leave 25 days

LinkedIn Learning access

Company pension contributions

Calm app subscription (NL only)

Public transport pass (NL)

Health insurance subsidy

Company laptop & phone

Job summary

Liberty Global is seeking a Network Security Specialist to ensure core and global tier-1 networks have robust security protections and are monitored effectively.

The role collaborates with core network architects and global security teams to drive improvements, develop threat playbooks, and mentor engineers, while responding to security incidents and translating findings into actionable risk advice.

Qualifications

• Solid grasp of networking, security and monitoring.
• Experience securing large ISP networks.
• Familiarity with BCP38/84, RPKI, BGP routing, DNS/DNSSEC operations.
• Strong knowledge of DoS protection and mitigation techniques.
• Experience presenting findings to other operational teams.
• Experience collaborating across international teams to improve security and incident response.
• RIPE NCC certification is a plus.
• Fluency in English (speaking and writing).

Responsibilities

• Act as authority on internet security topics for Liberty Global.
• Trace sources of BGP hijacks, leaks, DDoS, malware, and abuse traffic.
• Update security requirements to align with best practices.
• Drive security improvements and monitor network hygiene.
• Mentor and escalate for other engineers.
• Coordinate with SOC and external teams to set priorities.
• Translate investigations into risk assessments and actionable guidance.

Skills

Networking

Security

Monitoring

DDoS mitigation

BGP routing

RPKI

CoPP

DNS/DNSSEC

Security analytics

Tools

Arbor Threat Mitigation Suite

Splunk

Grafana

Elastic Stack

whois/RDAP

RIPE RIS

Job description

Liberty Global is seeking a Network Security Specialist to ensure core and global tier-1 networks have robust security protections and are monitored effectively.

The role collaborates with core network architects and global security teams to drive improvements, develop threat playbooks, and mentor engineers, while responding to security incidents and translating findings into actionable risk advice.