A global financial institution operated across dozens of sites with a mixed estate of Unix, Windows, and Cisco devices. Manual hardening and ad‑hoc changes created drift, audit gaps, and misconfiguration risk across the perimeter.

Design a programmatic security enforcement system to standardize configuration, reduce drift, and provide auditable control across servers and network devices.

• Built AEGIS actions, settings, and methods to harden devices based on OS and device type.
• Created scripts using the methods to harden devices starting with standard device images.
• Developed an enforcement toolkit with policy templates for Unix, Windows, and Cisco.
• Built declarative baselines, automated validation, and safe rollback to eliminate configuration drift.
• Exposed a central CLI & catalogs for repeatable changes and pre‑deployment checks.
• Integrated with change control for auditable, testable perimeter changes at scale.

• Consistently delivered perimeters across 80+ sites, effectively eliminating “operator error” issues.
• Compressed hardening & remediation timelines from weeks to hours for common tasks.
• Improved audit readiness with repeatable, verifiable controls.

Lowered operational risk from misconfiguration, reduced emergency change costs, and decreased audit findings through standardized, automated enforcement. Organized build and configuration operations for multiple perimeters responsible for Internet, Client, Market Data, Intranet, and Corporate functions.

Established a sustainable, code‑driven security model that scaled with growth, turning perimeter changes into fast, safe, and auditable workflows.