Sr. Staff Cyber Defense Engineer

Meet The Team: Dexcom's Information Security team is building Enterprise Cyber Defense (ECD), a global capability focused on proactive, threat-informed defense. ECD brings together detection engineering, incident response, threat hunting and validation, cyber readiness, cyber risk response, security automation, and defensive technology engineering. Where You Come In: You influence the technical strategy and roadmap for Enterprise Cyber Defense capabilities, aligned to business risk, the threat landscape, and Information Security priorities. You serve as a technical authority for cyber defense architecture, establishing design principles, telemetry standards, integration patterns, and engineering practices across cyber defense platforms and data sources. You own the enterprise detection engineering lifecycle, including detection logic, correlation rules, use cases, telemetry requirements, validation, tuning, and measurable efficacy across environments. You design and engineer cyber defense capabilities, including advanced detections, telemetry integrations, SOAR workflows, and agentic response patterns with appropriate human oversight. You lead major cross‑functional cyber defense initiatives and technology transformations, resolving complex dependencies, technical tradeoffs, and sequencing decisions. You provide senior technical leadership during the most complex cyber incidents and emerging or non‑traditional risk scenarios, driving root‑cause analysis, corrective actions, and durable defensive improvements. You define the technical approach for threat hunting and adversary validation, using threat intelligence, red and purple team findings, incident lessons, and simulations to improve defenses. You drive cyber readiness engineering through technical exercises, playbook validation, escalation testing, and the identification and remediation of systemic defense gaps. You translate technical risk for senior leaders and mentor engineers and analysts to strengthen technical maturity. What Makes You Successful: You have demonstrated success leading complex cyber defense initiatives across organizational boundaries. You bring deep expertise with SIEM, SOAR, XDR/EDR, NDR, identity and email telemetry, and cloud security technologies in large‑scale cloud, hybrid, and on‑premises environments. You have a strong engineering background in detection logic, automation, telemetry pipelines, API integrations, or security tooling using Python, PowerShell, SPL, KQL, SQL, or similar technologies. You have deep knowledge of adversary behaviors, threat hunting, incident response, digital forensics fundamentals, detection engineering, cyber threat intelligence, and MITRE ATT&CK. You have experience applying AI or machine‑learning capabilities to detection, investigation, or automated response, including performance measurement and appropriate human oversight. You demonstrate the ability to operate as a senior technical authority, influence leaders without formal authority, mentor senior practitioners, and make sound decisions in high‑stakes situations. You may also bring certifications such as CISSP, CCSP, GIAC, or equivalent advanced security certifications.