System Engineer Network & Security

Jan De Nul Group; Aalst; Hybrid; EUR 60,000 - 90,000; Full time

Benefits offered by this job

JDN Academy training

FIT program

42 paid vacation days

Flexible working hours

Occasional remote work

Group and hospitalization insurance

Job summary

Jan De Nul Group in Aalst, Belgium, seeks an experienced Network & Security System Administrator to design, implement, and maintain a robust global IT network supporting offices, sites, and vessels.

You will work with routers, switches, firewalls, VPNs, SSL, and monitoring in an international project environment, balancing performance and security while collaborating across teams and time zones.

Qualifications

• Bachelor’s degree in ICT-related field and 3+ years of relevant work experience.
• Strong knowledge of switches/routers (Cisco, Aruba) and firewalls (Fortinet, Palo Alto).
• F5, SSL encryption, VPN, and monitoring experience.
• Methodical, project-oriented, and able to work under pressure.
• Excellent Dutch and English communication.

Responsibilities

• Design, install, and configure the global network and security infrastructure.
• Support upgrading and patching systems and manage worldwide networks.
• Manage WAN, firewalls, security perimeter, and switches.
• Provide internal ICT support across offices, ships, and sites.
• Collaborate with Technical Support Engineers on complex issues.

Skills

Switches & Routers

Firewalls

VPN & SSL

Security Monitoring

F5

Networking Knowledge

Dutch-English communication

Education

Bachelor's degree in ICT or related field

Tools

Cisco

Aruba

Fortinet

Palo Alto

F5 BIG-IP

Monitoring tools

Job description

About the role

Are you an experienced Network & Security System Administrator who thrives in complex network and security environments? At Jan De Nul Group, headquartered in Aalst (Belgium), you will take responsibility for helping design, manage, and maintain a global IT network supporting our offices, construction sites, and vessels worldwide. In this role, you combine deep expertise in routing, switching, firewalls, and cybersecurity with an international project environment where stability, performance, and security are key priorities.

What you’ll do

As a Network & Security System Administrator, you speak the language of routers, firewalls, and switches, and you will be responsible for co-designing, implementing, and maintaining network and security solutions. This applies both to the local offices in Belgium as well as supporting the global projects of Jan De Nul.

In the morning, you start your day with a strong cup of coffee and a chat with colleagues. When you open your laptop, you already know how your day will go. If you find tickets from colleagues in your mailbox asking for ICT or network support, you will look for the most efficient and best-placed solution. You also answer questions from Technical Support Engineers — about networks, switching, ICT, or cybersecurity — including those onboard our ships worldwide. If it concerns a complex problem, you can’t wait to get started. And for that, you can always count on your colleagues who are happy to help! You easily switch between small and large projects and ad hoc challenges. In short, as a System Engineer, you ensure a high-performance network environment, a reliable data center, and optimal digital security — all on a large scale.

As a Network & Security System Administrator, you are the colleague who guarantees a stable and secure network.

• You are responsible for the design, installation, and configuration of the global network and security infrastructure;
• You provide support in upgrading and patching systems and play a crucial role in managing and optimizing worldwide network infrastructures. This way, you help ensure that data and systems are protected against potential threats;
• You manage the WAN, firewalls, security perimeter, and switches;
• You are the final internal link in the ICT department’s support process.

What do you need?

You have obtained a bachelor’s degree in an ICT-related field and have more than 3 years of relevant work experience. You have knowledge of switches/routers (Cisco, Aruba), firewalls (Fortinet, Palo Alto), F5, SSL encryption, VPN, and monitoring. You work methodically and project-oriented. Solving problems is your thing, and you also perform well under (time) pressure. You are a good communicator — both in Dutch and English — and you dare to ask colleagues for help, but only after you have first looked for a suitable solution yourself.

Why working for us

Working at Jan De Nul means joining the search for solutions to some of the biggest challenges of our time: from the energy transition to rising sea levels to smart mobility. It means learning and collaborating every day, with the goal of securing the quality of life worldwide for generations to come.

What we offer

• A permanent training program via our JDN Academy.
• The possibility to exercise at work through our FIT program.
• A permanent contract with 42 paid vacation days (20 statutory, 12 ADV, and 10 public holidays).
• A healthy work-life balance (flexible working hours and occasional remote work).
• A competitive salary with a thirteenth month and double holiday pay, including:
  • Meal vouchers and eco vouchers
  • The opportunity to participate in the Flex Reward program, including bike and car leasing, with fuel card or charging card in Belgium
  • Public transport allowance and bicycle reimbursement
  • Group and hospitalization insurance
  • Option for an iPhone with subscription
  • Various employee discounts
• You become part of an internationally growing family business.

The world becomes what you make of it

Jan De Nul shapes water and land worldwide. We drive the transition to renewable energy with offshore energy infrastructure. We focus on nature-inclusive dredging solutions to build ports and protect our coastline. We develop innovative construction projects for smart mobility and sustainable buildings. And we redevelop our planet by giving polluted sites a new purpose. At Jan De Nul, the world becomes what you make of it.

Jan De Nul Group promotes diversity and inclusion in the workplace. We are an equal opportunity employer and stand against discrimination.

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