Jennielyn Castro
Security Engineer - Amazon LEO | Threat Detection and Response Engineering
- Role
- Security Engineer, Amazon Leo at Amazon
- Location
- Bellevue, WA, US
- LinkedIn followers
- 500 followers
About Jennielyn Castro
I’m a Security Engineer focused on strengthening organizations through clear thinking, proactive defense, and practical problem-solving. I thrive in environments where I can simplify complexity, drive clarity, and turn ambiguity into meaningful outcomes that elevate security and operational reliability.My work centers on understanding how systems behave, identifying what matters most, and building solutions that reduce risk while empowering teams to move confidently and efficiently. I approach challenges with curiosity, resilience, and a bias for action—balancing strategic perspective with hands-on execution.Above all, I care about creating impact. I’m also a mom, a builder, and someone who moves with purpose. Everything I do—professionally and personally—is rooted in resilience, clarity, and a commitment to becoming better every day.
Experience
Security Engineer, Amazon Leo
Jul 2025 — Present · Bellevue, WA, US
Detection and Response EngineeringDesign and tune high-fidelity, scalable detections across endpoint, identity, cloud, and application data to identify anomalous and high-risk behavior in controlled environments supporting ITAR and CUI workloads.Perform gap analysis across telemetry, analytics, and coverage to identify blind spots and strengthen visibility, detection quality, and insider threat coverage.Turn ambiguous activity into precise detection logic, investigation guidance, and escalation criteria that support consistent triage and effective response.Build SOPs, runbooks, and repeatable practices for detection engineering, tuning, testing, and lifecycle management.Support application security reviews and threat modeling for telemetry pipelines and related systems to identify risk and strengthen security and monitoring requirements.Lead continuous improvement efforts that reduce noise, streamline analyst workflows, and improve SOC scalability and operational effectiveness.Drive measurable detection improvements through partnership across security, engineering, and operations teams.
Education
Arizona State University
Bachelor of Science - BS, Information Technology
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