Mainframe to cloud-native, without the downtime drama

“Move it to the cloud” is a sentence that hides years of risk. The systems worth modernizing are usually the ones you cannot turn off — claims processing, scheduling, anything with a regulator watching. Here’s how a cutover stays boring.

Strangle, don’t rip

Route new traffic to the new service behind a facade while the legacy system keeps running. Each capability moves only once it’s proven in production, so there’s never a single big-bang switch.

Make data the hard part you plan for first

Dual-write, reconcile, and verify before you trust the new store. Most “cloud migrations that went wrong” were really data-integrity problems wearing a cloud costume.

Measure the outcome, not the migration

A modernization that cuts cost and improves performance is a success; one that just relocates the same architecture to someone else’s servers is an invoice. Define the business result up front.