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Engineering7 min read

Modernising Legacy Systems Without Disruption

Incremental strategies that replace ageing software while the business keeps running.

By SysInteractive Team

Big-bang rewrites are risky. Incremental modernisation delivers value sooner and reduces the chance of costly failure.

The strangler pattern

Route specific capabilities to new services one at a time, gradually retiring the old system as each piece is replaced.

Protect the data

Data migration is often the hardest part. Plan reconciliation checks, rehearse migrations and keep rollback options available.

  • Map dependencies before you start
  • Add tests around existing behaviour
  • Release in small, reversible steps

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