Defensive Security Engineer; IR

Job Description

We're Adevinta, a global leader in digital marketplaces. Our household name brands, including Kleinanzeigen and ++ in Germany, Marktplaats in the Netherlands and Leboncoin in France, reach hundreds of millions of people every month.

We're all about matchmaking, and our sites help people find whatever they're looking for in their local communities -- whether it's a car, an apartment, a sofa or a new job. Every connection made or item found makes a difference by creating a world where people share more and waste less.

Our brands are supported by global Tech Hubs in Barcelona, Amsterdam, Paris and Berlin. Their goal is to develop common global products and innovation platforms which all of our brands can use. This means using cutting edge technology to create highly scalable, customisable and secure products and components that free up development time and leverage our access to global data.

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 ope rationalising threat intelligence to strengthen detection and prevention

Must be aligned with a Git Ops and defence‑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, Git Hub, Git Hub 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.

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…