Cybersecurity Expert (Freelance)

Smile Open Source Solutions; Sint-Pieters-Woluwe; Hybrid; EUR 110,000 - 165,000; Full time

Job summary

Smile Open Source Solutions in Brussels is seeking a Cybersecurity Expert (Freelance) to join our dynamic team on high-impact projects for a major client. The role is freelance with a hybrid setup (2-3 days remote per week), located in Brussels, Belgium.

As a cybersecurity expert you will assess security postures across infrastructures and cloud, design and implement security architectures, and collaborate with SOC teams to monitor and respond to incidents.

Qualifications

• Proven experience in cybersecurity engineering, architecture, or operations.
• Strong knowledge of network and system security, IAM, and cloud security.
• Hands-on with security tools such as SIEM, EDR/XDR, and vulnerability scanners.
• Familiarity with standards like ISO 27001, NIST, and GDPR.
• Professional fluency in English; knowledge of French or Dutch is a plus.

Responsibilities

• Assessing the security posture of infrastructures, applications, and cloud environments, and recommending remediation plans.
• Designing and implementing security architectures and controls (IAM, network segmentation, encryption, Zero Trust).
• Monitoring, detecting, and responding to security incidents in collaboration with SOC teams (SIEM, EDR/XDR).
• Managing vulnerabilities: scanning, prioritization, and follow-up of corrective actions.
• Contributing to compliance with standards and regulations (ISO 27001, NIS2, GDPR, DORA where applicable).
• Integrating security into development and DevOps processes (DevSecOps, secure code reviews, pipeline security).
• Writing security policies and procedures, and raising awareness among teams.
• (For Senior profiles) Acting as a trusted advisor to clients, steering security roadmaps, and mentoring team members.

Skills

Cybersecurity

Cloud security

IAM

SIEM/EDR/XDR

DevSecOps

Regulatory compliance

English proficiency

French/Dutch an asset

Tools

Microsoft Sentinel

Microsoft Defender

Splunk

CrowdStrike

Nessus/Qualys

Job description

Passionate about tech, digital, and innovation? Join the 1,800 employees at Smile, the European leader in open-source integration, spread across 20 agencies in 9 countries. Collaborative spirit and knowledge sharing are at the heart of our DNA. Our experts push the boundaries every day to build a smarter, more efficient, and more responsible digital world. Here, we don’t just follow trends, we create them! Join Smile in Brussels and take part in projects that truly matter!

We are currently looking for a talented Cybersecurity Expert (Freelance) to join our dynamic team and work on high-impact projects for one of our major clients.

Position Overview

• Status: Freelance

• Location: Brussels, Belgium (Hybrid model: 2-3 days of remote work per week)

Your Responsibilities

As a Cybersecurity Expert, your daily missions will include:

• Assessing the security posture of infrastructures, applications, and cloud environments, and recommending remediation plans.

• Designing and implementing security architectures and controls (IAM, network segmentation, encryption, Zero Trust).

• Monitoring, detecting, and responding to security incidents in collaboration with SOC teams (SIEM, EDR/XDR).

• Managing vulnerabilities: scanning, prioritization, and follow-up of corrective actions.

• Contributing to compliance with standards and regulations (ISO 27001, NIS2, GDPR, DORA where applicable).

• Integrating security into development and DevOps processes (DevSecOps, secure code reviews, pipeline security).

• Writing security policies and procedures, and raising awareness among teams.

• (For Senior profiles) Acting as a trusted advisor to clients, steering security roadmaps, and mentoring team members.

Profile & Technical Skills

• Proven experience in cybersecurity (security engineering, architecture, or operations).

• Strong knowledge of network and system security, IAM, and cloud security (Azure, AWS, or GCP).

• Hands-on experience with security tools (e.g., Microsoft Sentinel, Defender, Splunk, CrowdStrike, Nessus/Qualys).

• Good understanding of security frameworks and regulations (ISO 27001, NIST, NIS2, CIS).

• Certifications such as CISSP, CISM, CEH, OSCP, or Azure Security Engineer (AZ-500) are a strong asset.

• Excellent analytical skills, rigor, and a strong team spirit.

• Language: Professional fluency in English. Knowledge of French or Dutch is a plus.

Why Smile?

• Proximity Management: Our management by peers fosters open dialogue and the implementation of a tailored career path.

• Continuous Learning: Because the digital sector is in constant motion, Smile is committed to making you an expert in your field, thanks to a comprehensive training offer: access to an e-learning platform, financing of certifications, and knowledge-sharing tools.

• Vibrant Culture: Your year will be animated by group and agency events: annual convention, participation in trade fairs, summer party, and formal & informal afterworks.