Architect and implement secure AWS infrastructure patterns including IAM, VPC, KMS, EKS, Lambda, ECS/Fargate, S3, CloudTrail, and related services. Develop automation, tooling, and internal security services using Python or Go. Build cloud guardrails, AWS Config rules, SCPs, and automated remediation workflows. Design secure defaults and "paved roads" for engineering teams to follow best practices. Partner with Infra, SRE, and Application teams to design secure systems and APIs. Enhance least privilege policies for human and non-human identities through automation. Implement event-driven detections using CloudTrail, EventBridge, Lambda, and Step Functions. Threat model new services and provide actionable architectural guidance. Own key domains including secrets management, container security, and network segmentation. Contribute to documentation, playbooks, and reusable patterns to maintain high security standards.