Ciklum is looking for an Expert Cyber Security Engineer to join our team in Spain.
We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a integral team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.
About the role As an Expert Cyber Security Engineer, you'll become a part of a cross-functional development team engineering experiences of tomorrow.
Responsibilities Architect & Threat Model: Lead security design reviews and conduct in-depth threat modeling for new products and critical infrastructure
Research & Build: Investigate emerging threats and novel attack vectors, then use your findings to design and build defense strategies to mitigate them
Assess & Penetrate: Perform hands-on penetration testing and security assessments against our most complex systems to discover and validate vulnerabilities




Requirements 7+ years of hands-on long-term projects with a strong background in both offensive and defensive security
Significant, proven experience in penetration testing (web applications preferred) and a deep understanding of an attacker's mindset
Strong programming and scripting skills (Python preferred) with experience building security tools, automation, or prototypes
Deep technical knowledge in at least one core security domain, such as cryptography, authorization/authentication, secure architecture, network security
Very good communication skills (English)
Experience securing modern technologies like serverless architectures or AI/ML platforms
Experience with secure architectures for cloud-native environments (AWS, GCP, Kubernetes)
Relevant industry certifications (e.g., OSCP, OSCE, CISSP)
What's in it for you? Care: your mental and physical health is our priority. We ensure comprehensive company-paid medical insurance and 4 additional

📌 Expert Cyber Security Engineer (Madrid)
🏢 Ciklum
📍 Madrid