Cyber Security Consultant - Medior

Freelancer Opportunity

Job title: Cyber security consultant - Medior

Job location: Brussels, Belgium

Job duration: 2026-01-01 to 2026-12-31

Job weekly hours: 40 hrs./week

Based in Belgium, hybrid working 3 days/week at the office.

Fluent in English, with conversational ability in French or Dutch preferred

Long-term mission.

As a Systems Security Engineer, you will play a key role in implementing system-level security controls across PMH’s Windows and Linux environments, ensuring resilience and compliance without disrupting business continuity.

Your Role:

Implement and maintain system-level security controls for Windows and Linux platforms.

Perform continuous vulnerability management and patch management.

Define and enforce firewall, network, endpoint, and cloud security policies.

Collaborate with the internal Proximus CSIRT to enhance detections.

Evaluate and test security tools and recommend enhancements.

Perform hardening and configuration management to meet compliance standards.

Collaborate with IT teams to ensure operational stability during security rollouts.

Assist in creating and reviewing operational documentation for NIS2 compliance.

Support audits and compliance reviews by providing accurate technical input.

Participate in incident and change management processes to ensure secure implementations.

Your Profile:

3 to 10 years of experience in system engineering or security roles (Medior: 3+, Senior: 7+).

Solid understanding of Windows Server, Active Directory, Group Policy, and Linux distributions (RHEL, Ubuntu).

Experience with endpoint security, PKI, vulnerability management, and configuration baselines.

Familiarity with NIS2 requirements and ISO27001 principles.

Strong problem-solving and communication skills.

Relevant certifications such as CompTIA Security+, Microsoft Certified: Security Operations Analyst, RHCE, CISSP, GIAC (GSEC, GCWN).

Knowledge of automation tools (PowerShell, Bash, Ansible) is a strong asset.

Apply now and start your journey with Team Possible! We want to get to know you.

After your application, we will verify your profile and get back to you within 3

working days.

If you’re successful, you can expect the following steps:

An initial conversation with our recruiter - Swati Kumari

Interview with the Hiring Manager and the team.

Final decision

About Proximus

We are Team Possible turning tech into opportunities.

We are driven by four core pillars: "I care," "I make a difference," "I radically simplify," and "I embrace the future". This means you'll join a team that genuinely cares for customers and colleagues, is empowered to make a real impact, strives to radically simplify complex challenges, and is always looking ahead to embrace the future of technology. We believe in an inclusive and safe environment where everyone can thrive, offering extensive career development resources, including access to over 5,000 training modules and a minimum of 5 days of training per year, to help you continuously learn, grow, and tackle bold challenges with us.