Senior Cyber Security Consultant (SIEM Analyst) – Cyber Security Incident Response Team (CSIRT)

📍 Belgium (Hybrid – 1 day/week onsite) | with SII Group Belgium

At SII Belgium, part of the SII Group with more than 16,000 tech experts across Europe, we support companies in their innovation journey. Our mission? To bring deep technical expertise with a human-centered approach, empowering consultants to grow, take ownership, and collaborate on impactful projects. Recognized as a Great Place to Work, we’re committed to building a more secure and sustainable digital future.

Now, we’re looking for a SIEM Analyst to join our Cyber Security Incident Response Team (CSIRT) — the frontline defenders of our digital ecosystem.

💼 What You’ll Do

As a SIEM Analyst in CSIRT, you will:

• 🛠 Develop and enhance monitoring use cases to strengthen visibility and detection.
• 🔍 Validate and fine-tune ingested logs in the SIEM to ensure data quality.
• 🤝 Collaborate with our Cyber Defense Center and Threat Intelligence team to evolve and optimize detection rules.
• 📊 Create dashboards and reports for both operational teams and higher management.
• 🗣 Represent CSIRT in meetings with stakeholders to align on log collection requirements.
• 🛡 Support the blue team during red-team exercises, testing your detections in action.

🎯 Your Profile

We’re looking for a data-driven security expert with:

• 🎓 A Bachelor’s degree in Computer Science, Information Security, or equivalent experience.
• 💡 Strong knowledge of Windows, Linux, internet technologies, and network protocols.
• 📊 Hands-on experience with Splunk Enterprise Security (mandatory).
• 🔎 Skills in query languages (SPL, KQL, …).
• 🛡 SOC or CSIRT background = highly valued.
• ☁️ Familiarity with cloud platforms (Azure, AWS, GCP) = a strong asset.
• 📡 Experience in a telecom environment = big plus.
• 🧠 Flexible mindset, strong team spirit, and excellent communication skills.
• 🌍 Fluent in English (French/Dutch is a plus).

📌 Important

Applicants must:

• Have full rights as Belgian citizens, OR
• Have been residing in Belgium for 5–10 years.

🚀 Why Join SII Belgium?

• Be part of a mission-critical CSIRT team at the heart of cyber defense.
• Work with cutting-edge SIEM and threat intelligence tools.
• Contribute to high-impact projects across industries.
• Continuous growth with training, certifications, and mentoring.
• Competitive salary, benefits package, and flexible hybrid working.
• A company that values innovation, trust, and team spirit.

🔗 Ready to turn data into defense with SII Belgium?

Apply now and make your mark in the fight against cyber threats.

👉 Let’s Tech Together!