Senior Security Engineer Consultant

About the job

Senior Security Engineer Consultant

Keystone Solutions is seeking an experienced Security Engineer for a consultancy mission at a client site. The consultant will play a crucial role in enhancing the security posture of information systems within the water sector in Wallonia, focusing on operational security and compliance with NIS2 regulations.

• Participate in operational security (Sec Ops) for both internal systems and clients.
• Administer, configure, and optimize Security Centers (SIEM, EDR, vulnerabilities).
• Manage SOC alerts: qualification, analysis, escalations, and coordination with technical teams.
• Engage in incident response activities: containment, analysis, remediation, and reporting.
• Establish and adjust detection rules, dashboards, alerts, and playbooks.
• Configure and secure client technical environments: servers, networks, cloud, firewalls.
• Maintain and adjust security tools: EDR, SIEM, IDS/IPS, anti-malware solutions.
• Develop security-related projects such as unified vulnerability management.
• Apply hardening benchmarks (CIS, ANSSI, NIST).
• Conduct technical security reviews of projects and propose remediation plans.
• Document architectures, configurations, and security parameters.
• Contribute to internal and client technical risk analyses.
• Participate in drafting and improving policies, procedures, and processes.
• Prepare and support audits (internal, client, NIS2).
• Produce posture reports, KPIs, and security dashboards.
• Collaborate with systems, network, development, and support teams.
• Provide technical security advice in internal and client projects.
• Participate in security awareness initiatives for teams as needed.

• Attention to detail, analytical mindset, clear communication, autonomy, initiative, collaborative spirit, and service orientation.
• Rigueur et sens du détail, indispensable pour les environnements critiques.
• Esprit analytique, capacité à diagnostiquer et résoudre des incidents complexes.
• Clarté de communication, aussi bien avec des profils techniques que non techniques.
• Autonomie et initiative, capacité à prioriser dans un contexte multi-clients.
• Esprit collaboratif, travail en équipe avec le CISO, l'ISM et les équipes techniques.
• Sens du service, essentiel pour les activités MSP et la relation client.

• Strong knowledge of Windows Server / Linux environments, networking concepts (firewalls, VLAN, VPN, routing, segmentation), system hardening practices.
• Experience with EDR/XDR, SIEM, and SOC tools.
• Familiarity with Azure / Entra  / Microsoft 365 and Microsoft Security Center.
• Knowledge of vulnerability management, CVE scoring, remediation.
• Good technical documentation skills.
• Experience in multi-client/MSP environments.
• Strong knowledge of NIS2 directive, ISO 27001, or equivalent frameworks.
• Technical or security certifications appreciated (MS‑500/SC‑200, CySA+, CEH, etc.).

• 5+ years of experience in a security engineer role, Sec Ops, or security-focused system/network engineering.
• Proven experience in administering security tools (EDR, SIEM, monitoring).
• Experience in incident response or SOC monitoring preferred.
• Experience in MSP, MSSP, or multi-client environments highly valued.
• Strong knowledge of NIS2 directive, ISO 27001, or equivalent frameworks.
• Technical or security certifications appreciated (MS‑500/SC‑200, CySA+, CEH, etc.).

01/07/2026 – 30/06/2027 (12 months, full time)

• English – Professional working proficiency.
• French – Native or bilingual proficiency.