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# Cross-Domain Security Engineer - Guards and Data Diodes for NATO with security clearance

- **Company:** WLG
- **Location:** Bergen, Belgium
- **Experience:** Experienced
- **Contract:** Permanent contract
- **Skills:** Bash Shell, Complex Networks, Cyber Security, Electronic Data Interchange (EDI), Python (Programming Language), Linux System Administration, Network Protocols, Red Hat Enterprise Linux, Ansible, TCP/IP, Traffic Analysis, Firewalls (Computer Science), Selinux
- **Published:** September 9, 2026
- **Apply:** https://www.adzuna.be/details/5876190397

## About the Role

* At least three years in cyber security or a closely related field.
 * Three years or more of Linux system administration, Red Hat Enterprise Linux preferred.
 * Scripting and automation with Bash, Python and Ansible.
 * Experience with boundary protection devices such as firewalls, and with system hardening including SELinux.
 * Network protocols and traffic analysis, TCP/IP services, LAN and WAN architecture, and the patience to troubleshoot a complex network security problem.
 * A relevant certification such as CISM, CISSP or GIAC.
 * A degree in a related discipline with three years of experience after it - or roughly ten years of progressive experience in this work instead.

## Description

* Administering and configuring guards and data diodes centrally, so cross-domain flows stay available and correct.
 * Installing and configuring hardware and software, verifying that each configuration really meets the data exchange requirement behind it.
 * Adapting release markings and attachment handling, adding new flows, managing users and access.
 * Monitoring performance and availability, and troubleshooting application faults to a resolution.
 * Writing automation for the repetitive parts of administration.
 * Following patch releases, testing them, taking them through the approval process and installing them.
 * Documenting what exists - procedures for repeat activities and proper documentation for every system you implement.
 * Providing technical support to other teams and to users when a cross-domain exchange fails.


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