Freelance Cybersecurity Expert — Hybrid (Brussels)

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

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.