Cyber Security Consultant - Medior

Freelancer Opportunity

Job title: Senior Information Security Officer

Job location: Brussels, Belgium

Job duration: 2026-04-27 to 2026-10-31

Job weekly hours: 40 hrs./week

Job language required: Fluency in Dutch & English

Job salary range: 700 to 750 euros a day

Job description:

Senior Information Security Officer

Are you passionate about #AI or #cybersecurity? You love working with high profile teams with a sure taste for challenge and variety? You dream to join a fast-growing company with start-up mentality? Eager to learn continuously? Join Proximus Ada!

Within the Proximus’ Centre of Excellence for AI and Cybersecurity, the mission of the Security Management and CSIRT teams is to protect Proximus, its customers, its business, its operations and reputation against external and internal threats. You will be fascinated by a highly dynamic environment, the strong collaboration and some deep technical aspects.

Within the Security Management team, we are looking for a Senior Information Security Officer to reinforce the team.

Your Role:

Provide CISO-as-a-Service (CISOaaS) to entities of the Proximus Group to assist with the overall reinforcement of their security posture.

Help them in maintaining their ISO27001 certification or in preparing for an ISO 27001 certification and achieving NIS2 compliance.

Perform cybersecurity assessments (NIS2, ISO27001, security maturity, risk) to identify gaps in the security program, define a baseline, As-Is state, To-Be desired state and establish a roadmap.

Create information security policies, procedures, guidelines and processes.

Evaluate the existing architecture for threats and risks and make recommendations.

Advise on cybersecurity risk and governance program.

Assist in reaching or maintaining compliance with information security legal, contractual, or internal requirements.

Assist IT teams with the implementation of projects acting as interim security officer, execute risk assessments.

Define, test crisis management, business continuity, or disaster recovery planning.

Set up reporting activities related to the status of information security.

Organize security awareness programs.

Respond to customer due diligence requests for the products that Proximus offers to its customers by completing security questionnaires within established SLA.

Support direct sales with security expertise in conversations with customers.

Your Profile:

Bachelor’s or a master’s degree in cyber security or computer science.

5+ years of experience in a combination of audit, risk management, information security and IT jobs.

Knowledge of information security management frameworks, such as ISO 27000 series, NIST, ISF, CIS and NIS2 Directive.

Experience in multiple security domains (Risk Management, Governance, Network and Application security, Vulnerability Management, IAM …), experience with various security technologies and tools and Cloud platforms.

Experience with ISMS ISO 27001 implementations, conducting or supporting audits, risk assessments.

Certified ISO 27001 Lead Auditor/Implementer and other certifications, such as NIS2 Lead Implementer, ISO 9001 LA/LI, CISSP, CISM.

Excellent knowledge and hands-on experience with MS Azure are a must.

Previous experience and knowledge in telco domain are a plus.

Excellent written and verbal communication skills and high level of personal integrity.

Proven project management skills.

Can operate with a great deal of autonomy, results-oriented and able to deliver within preset deadlines.

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.