Senior Security Engineer (Detection Engineering)

Join Fastly as a Senior Security Engineer on our Detection Engineering team. In this role, you will build detections to catch malicious activity, drive investigations, and develop AI agents and automations to support detection and response. You will also lead security investigations, conduct threat hunts, and participate in on-call rotations. Benefits include generous parental leave, health and wellness coverage, retirement plans, and opportunities for learning and growth.

• Concevoir et construire des agents d'IA et des automatisations pour soutenir la détection et la réponse.
• Développer des détections et d'autres analyses pour identifier les menaces dans divers environnements.
• Diriger les enquêtes de sécurité, en analysant des sources de journaux complexes et des télémetries.

• Direct experience integrating AI tools, LLMs, and automated agents into security operations workflows to accelerate alert triage, contextualize telemetry, and speed up incident response
• In-depth knowledge of major public cloud platforms (e.g., AWS or GCP) and Linux environments, including containers (e.g., Kubernetes), along with their native logging and security tooling
• Proven track record of leading complex security incident investigations, with deep expertise in log analysis, real-time containment, and collecting forensic artifacts
• Experience developing, testing, and tuning detections using a detections-as-code approach, including version control and CI/CD
• Strong coding skills in Python or another general-purpose language, with experience building automations for detection and response
• Solid grasp of attacker tactics and techniques, with experience in threat hunting or threat modeling to guide detection priorities
• Familiarity with content delivery networks (CDN), edge cloud platforms, or Fastly products and services
• Experience designing and maintaining scalable ETL processes and data pipelines to ingest, transform, and normalize security telemetry for large-scale analysis
• Experience deploying AI agents in production to detect threats, enrich alerts, and automate response