Defensive Security Engineer - IR

We are Adevinta, a leading online classifieds group and champion for sustainable commerce across Europe and beyond. With digital marketplaces across many countries, our portfolio spans consumer goods, mobility, real estate, holiday rentals and jobs. Together, our marketplaces attract more than 120 million users every month and over a million businesses.

Our locally loved marketplaces, including Marktplaats in the Netherlands, mobile.de in Germany, Kleinanzeigen in Germany and Spain, leboncoin in France and Subito in Italy, help everything and everyone find a new purpose by creating perfect matches  – whether it’s a car, an apartment, a sofa or a new job.
Our brands are supported by global Hubs in Barcelona and Amsterdam.

We are looking for an experienced defensive security engineer with hands-on expertise in incident response and security operations in large enterprise environments. Comfortable working autonomously across the full incident response lifecycle - preparation, detection, analysis, containment, eradication, recovery and learning - and able to lead or support response efforts under pressure. Should have solid experience operating and enhancing defensive security technologies including EDR, SIEM, DLP, NIDS and threat intelligence solutions. Must be able to develop and refine incident response policies, playbooks, escalation procedures and tabletop exercises, and contribute to post-mortem analyses that feed back into detection and response improvements. Skilled at gathering, analysing and operationalising threat intelligence to strengthen detection and prevention

Responsibilities

Adevinta's defensive security operates across three tiers: the SOC (MSSP, SCASSI) handles L1 triage, Core Defense provides L2 incident response, and Cloud Defense acts as L3 specialist escalation for cloud and platform-level investigations. While the SOC is gaining traction into the environment, SIEM coverage and maturity are increasing across marketplaces through the multi-tenant expansion, and new signals from tools like Wiz are adding scope and depth to the cloud security telemetry flowing into the platform. Together, these developments are driving a growing volume and complexity of security events that require deep technical investigation at the L3 level.

Cloud Defense is the team that provides specialist escalation when incidents involve cloud infrastructure, platform-level systems or require advanced containment and eradication actions. This engineer will strengthen that L3 capability by leading deep investigations into cloud and platform incidents escalated from Core Defense, developing and refining cloud-specific playbooks and escalation procedures aligned with the priority framework, participating in the on-call rotation, and contributing to post-mortem analyses that improve detection and response over time. They will also operationalise threat intelligence by feeding it into the SIEM detection pipeline, and collaborate with Core Defense and SCASSI to ensure escalation paths and coordination channels work effectively across all three tiers.

Requirements

Must be aligned with a GitOps and defense-as-code approach: managing detection content, security configurations, playbooks and operational tooling as versioned code in Git, with peer reviews, automated testing and repeatable deployments. Good understanding of AWS Cloud technologies, services, security capabilities and controls (SCPs, Security Groups, IAM). Familiar with SDLC and modern tooling and ecosystems such as Kubernetes, GitHub, GitHub Actions, CI/CD pipelines and infrastructure as code. Experience with security frameworks and methodologies such as MITRE ATT&CK or NIST. Familiar with Incident Management At Google (IMAG) and Agile methodology. Strong analytical and problem-solving skills with the ability to synthesise complex data into actionable insights. Fluent in English. 4+ years in a security engineering, SOC or incident response role.

Nice to have: public or private presentations, open-source contributions, certifications, participation in bug bounty programs, CTF competitions or ethical hacking communities.

Benefits

• An attractive Base Salary
• Participation in our Short-Term Incentive plan (annual bonus)
• Work From Anywhere: Enjoy up to 20 days a year of working from anywhere! Maybe not from the moonwell why not! just make sure you have internet connection!
• A 24/7 Employee Assistance Program for you and your family, because we care ‍
• Win together, lose together is one of our key behaviours. At Adevinta you will find a collaborative environment with an opportunity to explore your potential and grow