Senior Threat Hunter

Cyber Security - Senior Threat Hunter

The opportunity:

We are looking for SOC L3 Threat Hunter is responsible for proactively identifying advanced, stealthy, and previously unknown threats across enterprise environments. This role operates beyond alert-driven SOC operations, focusing on hypothesis-based threat hunting, adversary behaviour analysis, and closing detection 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

MITRE ATT&CK techniques

Threat intelligence

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 Defender Suites

· Strong mastery of KQL (Kusto Query Language)

· Deep understanding of MITRE ATT&CK, Adversary tradecraft, Malware and
post-exploitation techniques

· Strong skills in Endpoint telemetry analysis, Network traffic analysis, Log correlation
across multiple security layers

· Advanced analytical and critical-thinking skills

· Strong written and verbal communication

· Curiosity-driven, attacker-mindset analysis

· Ability to work independently on ambiguous, high-impact threats

Qualifications:

· Bachelor's degree or a master's degree in computer engineering, IT security, Computer
Science, Information Systems or other related fields.

· Highly proficient in English with good written and oral communication.

· Good analytical, problem solving and interpersonal skills.

What we offer

In EY GDS Spain, we're committed to fostering a vibrant environment where every team member can thrive. We provide a space for continuous learning and the flexibility to define your own success, empowering you to make a meaningful impact in your own way. Our diverse and inclusive culture values who you are and encourages you to help others find their voice.

Additionally, here's what makes us stand out:

• Empowering Career Development: Unlock your potential with tailored training and development programs designed to elevate your skills and propel your career forward. We invest in your growth because your success is our success.
• Flexible Work-Life Integration: Enjoy the freedom of our hybrid work model, allowing you to blend professional responsibilities with personal passions. We understand that life is more than just work, and we support you in achieving that balance.
• Comprehensive Well-Being Programs: Prioritize your health with our extensive wellness initiatives, including psychological support sessions and health resources. At EY GDS Spain, your well-being is at the heart of what we do.
• Meaningful Volunteering Opportunities: Make a difference in your community through our engaging volunteering programs. Join us in giving back and creating a positive impact while building connections with like-minded colleagues.
• Recognized Performance and Rewards: Celebrate your achievements with our recognition programs that honor both individual and team successes. We believe in acknowledging hard work and dedication, ensuring you feel valued every step of the way.

Join us at EY GDS Spain, where your journey is supported, your contributions are celebrated, and your future is bright.

To learn more about what we offer, visit our Careers in Global Delivery Services | EY - Global

EY Global Delivery Services (EY GDS) is a dynamic and truly global delivery network of over 75,000 people working across the world, to provide innovative and strategic business solutions to our clients worldwide. We play a vital role in growth strategy, helping our clients become agile and efficient, and helping fulfill our purpose to build a better working world.

From accountants to coders, we offer a wide variety of fulfilling career opportunities that span all business disciplines. We look for skills that are evergreen and our roles evolve with industry trends. We also work across Finance, Business Development, Technology, Talent, Procurement and Risk Management functions to help our teams operate as efficiently and effectively as possible.

Across our 10 locations and 21 cities, we work with teams from all service lines, geographies, and sectors. We operate in Argentina, Hungary, India, the Philippines, Poland, Sri Lanka, Mexico, Spain and the United Kingdom.

Our EY GDS Spain office is located at Malaga Technology Park and currently employs over 1000 people.

If you are interested in being part of our team, we kindly invite you to submit your CV in English to apply for this position.

The exceptional EY GDS experience. It's yours to build.