Senior Security Engineer (SIEM)

NextLink Group; Sant Cugat del Vallès; On-site; EUR 60,000 - 90,000; Full time

Job summary

NextLink Group is seeking a Senior Security Engineer (SIEM) to join our CISOC team and work with a leading pharmaceutical client. You will focus on security monitoring, detection development, automation, and reporting using SIEM/XDR technologies.

You will design and tune use cases, develop scripts and integrations, and contribute to threat simulations to improve detection. Collaboration with Security Detection, Incident Response, Risk, and Information Security teams is essential.

Qualifications

• Hands-on experience with SIEM/XDR and security monitoring/detection.
• Experience developing and tuning detection use cases (e.g., MS Sentinel/Defender).
• Programming/scripting: Python, PowerShell, Bash and API integrations.
• Good understanding of risk, triage, change management, and remediation.

Responsibilities

• Design, implement, and improve SIEM/XDR security use cases with reduced false positives.
• Develop scripts, integrations, and APIs to enrich SIEM/XDR capabilities.
• Support simulated threats to test and improve detection use cases.
• Evolve security technologies per roadmap and work with teams on detection enhancements.
• Present monitoring status and updates to technical experts and management.
• Follow SOPs and document security monitoring processes and findings.

Skills

SIEM/XDR

Threat detection

Python

PowerShell

APIs

Bash

English communication

Tools

Microsoft Sentinel

Microsoft Defender

ServiceNow

Job description

• Assigned Recruiter(s) Suchitra Garikapati
• Date Opened 09/17/2026
• Country Spain
• Job Posting ID ZR_4444_JOB

What is the mission about?

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Job Description

At NextLink, we are looking for a Senior Security Engineer (SIEM) to join our team and collaborate closely with one of our most recognized clients in the pharmaceutical sector.

You will join the Cyber Intelligence & Security Operations Center (CISOC) team, focusing on security monitoring and detection capabilities through SIEM/XDR technologies.

The role combines hands‑on security engineering, use case development, automation, detection improvement, reporting, and collaboration with Security Detection, Incident Response, Risk, and Information Security teams.

Main Responsibilities:

• Design, implement, and continuously improve SIEM/XDR security use cases, including fine-tuning to reduce false positives.
  
• Develop and maintain scripts, integrations, and APIs to enrich SIEM/XDR capabilities and automate security monitoring activities.
  
• Support the implementation and maintenance of simulated threats / BAS scenarios to test and improve detection use cases.
  
• Contribute to the evolution of security technologies in line with the defined roadmap and improve detection capabilities together with Security Detection and Incident Response teams.
  
• Act as a point of contact for security monitoring reports and dashboards, presenting status and updates to technical experts and management.
  
• Follow defined frameworks, processes, SOPs, and working instructions, ensuring compliant and up-to-date documentation.
  
• Collaborate with Risk and Information Security teams on identified risks, remediation, prioritisation, analysis, triage, and security monitoring improvements.
  

Requirements

• Proven hands‑on experience with SIEM/XDR technologies and security monitoring/detection activities.
  
• Experience developing and fine‑tuning security detection use cases, ideally with technologies such as Microsoft Sentinel or Microsoft Defender.
  
• Programming/scripting experience with Python, PowerShell, Bash, or similar, including API integrations.
  
• Good understanding of security weaknesses, remediation processes, prioritization, change management, analysis, and triage.
  
• Strong analytical thinking, problem-solving, communication, teamwork, agility, and results‑oriented skills.
  
• Excellent spoken and written English.
  
• Experience working in virtual, international, and multicultural environments.
  
• Experience with Breach & Attack Simulation (BAS) and simulated threat creation.
  
• Experience with reporting and ticketing platforms such as ServiceNow.
  
• Relevant SIEM/XDR certifications, particularly related to Microsoft Sentinel or Microsoft Defender, are a plus.
  
• Security certifications such as Security+, CE, GCIH, ECIH, OSCP, or CEH are desirable but not mandatory.