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Glossary·
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Definition

Legacy modernisation

Bringing an old but working system up to date — replacing it piece by piece, or rebuilding it — without stopping the business that depends on it daily.

Why it matters

Legacy systems usually still earn money, which is why the big-bang rewrite fails so often: it bets years of budget on a switch-over date that always slips.

How we approach it

We prefer strangling the old system gradually: put a façade in front, move one capability at a time with data kept consistent, and keep both running until the last route is migrated.

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