Location: Hybrid / Remote
Employment: Full-time
Team: Detection Engineering
ABOUT DEFION
At DEFION, we have been protecting organizations with advanced cybersecurity solutions since 2005. We are a reference in incident response, digital forensics, managed security services, threat intelligence, and offensive security projects (Red & Purple Team).
Our technical team is made up of highly qualified professionals with real experience in complex and critical environments. We work with cutting-edge technology, agile methodologies, automation, and a collaborative approach that fosters both technical and professional growth.
With an international presence and in full expansion, DEFION is committed to talent, continuous training, and career development. Here you won't just consume intelligence — you will generate it and apply it to create effective detections. You will work in a multidisciplinary team, transforming findings from real offensive security projects into detection rules.
BACKGROUND
As part of our Detection Engineering and MDR-Extended service,



we are looking for profiles with experience in creating rules (EDR/XDR/SIEM), behaviour-based detection, and TTP analysis. If you are passionate about designing detections that make a difference, DEFION is looking for you.
FUNCTIONS AND RESPONSIBILITIES
As a Detection Engineer, you will play a key role in strengthening our clients' security posture. You will apply your knowledge of adversarial tactics and techniques to design and develop advanced detection rules that enable effective identification and response to security threats. Your responsibilities will include:
- Designing, developing, and fine-tuning detection rules in SIEM, EDR, and XDR platforms to improve threat detection and incident response capabilities.
- Analyzing results from attacker simulations to identify weaknesses in security controls.
- Developing detection and mitigation strategies for emerging threats.
- Automating and optimizing processes by creatin

📌 Detection Engineer (Barcelona)
🏢 Defion
📍 Barcelona