Ingénieur Système Medior

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Brussels, Brussels, Belgique ITProposal Temps plein

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IT Security Specialist – Elastic / SIEM (ELK Stack) Brussels, Belgium (Hybrid – near Brussels North) Full-time | Contract until December 2026 (9 months)

About the Role
We are looking for an IT Security Specialist with strong expertise in the Elastic Stack (ELK) to join a cybersecurity team focused on log management, monitoring, and threat detection . You will play a key role in designing, deploying, and maintaining a centralized security monitoring platform , leveraging Elastic technologies to enhance visibility and strengthen the overall security posture.

Key Responsibilities
Security Monitoring & SIEM Implement and configure Elastic Security (SIEM) for threat detection and analysis Develop use cases for identifying and responding to security events Configure alerts, dashboards, and monitoring tools Data Collection & Processing Design and maintain log ingestion pipelines using Logstash and Kafka Collect and integrate logs from multiple sources (Firewall, WAF, IAM, IDS/IPS, etc.) Normalize data using Elastic Common Schema (ECS) Elastic Stack Implementation Deploy and manage Elasticsearch, Kibana, Logstash, Elastic Security, and Elastic Defend Configure and manage Elastic Agents via Fleet (policies, lifecycle, large-scale deployment) Participate in the design of Fleet Server architecture and endpoint integration Endpoint Security Deploy and configure Elastic Agents on Linux and Windows servers Implement endpoint protection and behavioral analysis using Elastic Defend Collaboration & Knowledge Sharing Support internal teams in adopting Elastic security best practices Provide guidance and training where needed Collaborate closely with security and infrastructure teams Documentation Produce technical and operational documentation Ensure proper knowledge transfer and long-term maintainability Required Skills & Experience Strong hands-on experience with the Elastic Stack (Elasticsearch, Kibana, Logstash) Experience with Elastic Security (SIEM) and Elastic Defend Proven expertise in Fleet architecture and Elastic Agent management Experience building and managing log ingestion pipelines Knowledge of security tools and environments (Firewall, IDS/IPS, IAM, etc.) Understanding of log normalization and ECS standards Nice to Have Experience with Apache Kafka Knowledge of Ansible or automation tools Familiarity with threat modeling and security frameworks Languages French – Native proficiency English – Working proficiency Work Environment Hybrid setup: minimum 50% on-site (at least 1 day per week) Collaborative environment within a dedicated cybersecurity team Opportunity to work on large-scale security monitoring and SIEM implementation

Ingénieur Système Medior

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