Cloud incident response and defensive testing anchor this Staff Security Engineer prospect at Fullscript. Work in-office, at home, or combine both. You will lead investigations and improve response readiness across cloud infrastructure, identity, endpoints, applications, and AI services. This Staff-level role includes threat modeling, purple-teaming, adversarial validation, and on-call incident response. You will translate threat intelligence into detections while working with Engineering and Platform teams on telemetry, authorization, and access-control requirements. Key Responsibilities:
Lead security investigations through containment and resolution Maintain response playbooks from investigation lessons Threat model AI agents and existing systems Coordinate indicator blocking across endpoint, network, and web layers Evaluate access-control changes and drive remediation Requirements:
8+ years in security engineering or incident response Experience securing AWS or other cloud environments Modern SaaS and identity stack security experience Adversary tradecraft knowledge, including MITRE ATT&CK; Ability to partner on telemetry and control requirements Strengthen Fullscript’s incident response, cloud security, and AI defensive testing with practical Staff-level engineering leadership.