Network Security Engineer

The Opportunity

We are looking for an experienced Infrastructure Security & Network Engineer to join a global IT infrastructure team on a 12-month contract.

In this role, you will be responsible for implementing, maintaining and improving enterprise network and security infrastructure across both on-premises and cloud environments.

You will work closely with infrastructure, enterprise security and cloud operations teams, helping ensure that global network services remain secure, reliable and efficient.

This is a hands-on technical position suited to someone with a strong background in network infrastructure who has developed specialist expertise in network security, Cisco technologies and infrastructure automation.

Key Responsibilities

• Design, implement, maintain and support enterprise network and security infrastructure.
• Configure, manage and support Cisco security technologies, including firewalls and network access control solutions.
• Implement and maintain Cisco Identity Services Engine (ISE), including 802.1X and network authentication services.
• Monitor security controls, investigate technical issues and escalate potential risks.
• Manage the installation, integration, upgrading and maintenance of security products across global environments.
• Identify opportunities to automate infrastructure and security processes using scripting and orchestration tools.
• Support AWS cloud infrastructure and related security services.
• Perform network troubleshooting, packet captures and traffic analysis.
• Review existing security systems and identify opportunities for technical improvements.
• Collaborate with global infrastructure and security teams and provide technical guidance and knowledge sharing.
  
  

Essential Technical Experience

We are looking for candidates with at least 5 years of professional IT experience, including 3 years in a similar infrastructure, networking or security position within an enterprise environment.

You should have experience with:

Network Security & Cisco Technologies

• Cisco Identity Services Engine (ISE).
• 802.1X / DOT1X, AAA and network access control.
• Cisco ASA and Firepower Threat Defense (FTD).
• Cisco security solutions such as AMP and Umbrella.
• pxGrid integrations.

Cloud & Automation

• Amazon Web Services (AWS).
• Infrastructure automation and orchestration.
• Python and Shell scripting.

Security Monitoring & Vulnerability Management

• SIEM platforms such as Splunk.
• Nessus or similar vulnerability assessment tools.
• Security monitoring and control effectiveness.

Infrastructure & Networking

• Microsoft Active Directory.
• Linux administration.
• Strong TCP/IP networking knowledge.
• Network troubleshooting, packet captures and traffic analysis.
• Understanding of authentication, authorisation and accounting (AAA).
  
  

Desirable Experience

• Docker and Kubernetes.
• Kali Linux.
• Basic penetration testing and ethical hacking.
• Security certifications such as CEH, CISSP or equivalent.
• Experience within large-scale enterprise, telecommunications, financial services or utilities environments.
  
  

What Makes This Opportunity Interesting?

• Work within a global enterprise IT environment.
• Exposure to a varied network and security technology landscape.
• Opportunity to work with advanced Cisco security technologies.
• Involvement in infrastructure automation and cloud security initiatives.
• Collaborate with international technical teams.
• A 12-month contract with a hybrid working arrangement.
  
  

Contract Details

• Location: Hoofddorp, Netherlands (close to the train station).
• Working arrangement: Hybrid.
• Duration: 12 months.
• Start: ASAP, latest 1 December 2026.
• Contract options: Employed contractor arrangement or ZZP / self-employed freelance contract, depending on candidate preference and eligibility.
  

Darwin Recruitment is acting as an Employment Business in relation to this vacancy.