Modernising a business-critical inherited platform without stopping operations

Context

The platform had become essential to daily operations while documentation and architectural clarity had not kept pace with its importance.

Problem

A complete rewrite would have introduced unacceptable delivery and operational risk. Continuing without intervention made every future change slower and harder to reason about.

Approach

The engagement begins by reconstructing the actual system: data flows, ownership, dependencies, failure behaviour and operational workarounds.

Modernisation is then staged around risk rather than fashion.

Outcome

Use this starter study to document a real rescue or inherited-system engagement once you choose the example you want to publish.