Free Ebook
Modernising Legacy Systems
Replace what's costing you, keep what's working
Rewrites fail more often than they succeed, and the systems that most need attention are the ones nobody dares touch. This guide covers assessing a legacy estate on delivery pain rather than code aesthetics, using the strangler-fig pattern to replace components incrementally, and getting data across without losing it.
Who it's for
CIOs and engineering leaders carrying a system that's expensive to change and risky to replace.
What you'll take away
- A scoring method for ranking components by cost-of-change
- A migration sequence template with rollback points
- The reconciliation checks that catch silent data loss
What's inside
- 1Assessing the estate: which parts are actually costing you
- 2Repair, replace, or leave alone — a decision framework
- 3Strangler-fig migration without a freeze on feature work
- 4Characterization tests for code with no test suite
- 5Data migration: profiling, mapping, and reconciliation
- 6Sequencing a programme that survives a change of sponsor
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