Threat Hunter - Senior - EY GDS Spain - Hybrid

Cyber Security – Senior Threat Hunter

The opportunity:

We are looking for SOC L3 Threat Hunter is responsible for proactively identifying advanced, stealthy, andpreviously unknown threats across enterprise environments. This role operates beyond alert-driven SOCoperations, focusing on hypothesis-based threat hunting, adversary behaviour analysis, and closingdetection gaps across Microsoft Sentinel, Microsoft Defender for Endpoint, and Defender for IoT.

The role serves as a technical authority within the SOC, supporting L1/L2 analysts, partnering with Incident.Response and Detection Engineering teams, and continuously improving the organization’s threat visibility and SOC maturity.

Your key responsibilities:
- Conduct hypothesis-driven, TTP-centric threat hunts using telemetry from Microsoft
Sentinel and Microsoft Defender platforms.
- Develop hunt hypotheses based on:
- Adversary campaigns
- Observed environmental weaknesses
- Hunt for advanced attack behaviors.




- Validate findings with evidence and determine impact before escalation.
- Perform advanced KQL-based threat hunting across large data volumes in Microsoft
Sentinel.
- Identify detection blind spots, noisy analytics, and data quality issues.
- Conduct advanced endpoint hunting using Defender Advanced Hunting
- Correlate endpoint telemetry with SIEM data to reconstruct end-to-end kill chains.
- Perform threat hunting across IoT/OT and ICs environments using Microsoft Defender
for IoT telemetry where applicable
- Produce formal threat hunt reports detailing: Hunt Hypothesis, Data Sources, Findings
and evidence, MITRE ATT&CK; mapping and recommended remediation

Skills and attributes for success:
- 4–7+ years in SOC, Threat Hunting, Incident Response, or Detection Engineering.
- Proven experience performing proactive threat hunting (not tool monitoring).
- Experience working in enterprise-scale SIEM and EDR environments.
- Advanced expertise in MS Sentinel and

📌 Threat Hunter (Málaga)
🏢 Ey Studionederland
📍 Málaga