SIEM Engineer - Senior – EY GDS Spain - Hybrid

The opportunity
Are you ready to shape your future with confidence?
As a Senior SIEM Engineer, you are part of the EY Cyber Security team, working in a Threat Detection & Response (TDR) environment with a strong focus on Microsoft Sentinel and XDR. You design, integrate, and operate SIEM use cases and automations and support clients in securely operating modern cloud-native security platforms. Knowledge of Splunk or open-source SIEM ecosystems (e.g., Elastic/ELK, Wazuh) is considered a strong advantage.
As a member of our team in the EY GDS Spain office in Malaga , you’ll have a chance to extend your knowledge & experience by working on interesting projects with the latest technologies and approaches. You’ll support clients in choosing the most suitable business solution and take part in digital transformation.

Your key responsibilities
· Integrate data sources into Microsoft Sentinel (cloud, identity, endpoint, network, and on-prem) and ensure data quality and normalization.
· Design, implement, and operate analytics rules,



SIEM use cases, and hunting queries (KQL; SPL experience is a plus).
· Develop and maintain playbooks and automations using Azure Logic Apps to enrich, orchestrate, and standardize response workflows.
· Act as a technical subject matter expert for SIEM and Microsoft Sentinel/XDR solutions and provide hands-on guidance to stakeholders.
Optimize SOC Operations leveraging the latest AI capabilities
· Continuously optimize detection, response, and automation capabilities (tuning, false-positive reduction, performance, and maintainability).
· Contribute to engineering best practices such as documentation, repeatable deployments, and (where applicable) detection/content as code.

Skills and attributes for success
· Strong knowledge of cloud security concepts, SIEM architectures, and the MITRE ATT&CK; framework.
· Hands-on engineering mindset with solid troubleshooting, analytical thinking, and attention

📌 Senior SIEM Engineer (España)
🏢 Ernst & Young
📍 España