——Case studies
Anonymized engagements, written for the engineer who reads carefully.
Sector and shape, never client names. Each study covers the situation, the constraint, what we did, and the measured outcome.
- Regional healthcare network · ~60 sitesApr 18, 2025Read
59-branch SD-WAN migration, no user-visible downtime
A regional healthcare operator migrated 59 branches from MPLS to Catalyst SD-WAN with cloud onRamp to Azure. We led the cutover plan and ran every change against a lab pair before touching production.
- Enterprise IT · ~9,000 endpointsFeb 2, 2025Read
Multi-node ISE cluster upgrade with no auth interruption
An enterprise on a trailing ISE train needed to land a multi-node upgrade across PSNs and PANs without breaking 802.1X authentication for a single client.
- Public-sector agency · ~120 sitesNov 20, 2024Read
Panorama rule-base hygiene and segmentation sprint
Years of accumulated firewall rules had eroded least-privilege. We rebuilt the rule base around documented business flows and brought logging into a usable shape.