Tag: migration

All the articles with the tag "migration".

• Shadow mode as a default, not a luxury

  9 Oct, 2026

  Run the new implementation beside the old on real traffic, with every side effect suppressed. Contract tests prove the shape; shadow mode proves behaviour.

• The strangler fig

  25 Sep, 2026

  The strangler fig is the safe way to replace a legacy system, not the easy one. What decides it: the seam, the system of record, and whether you finish.

• Zero-downtime by design

  28 Aug, 2026

  Zero-downtime isn't a feature you switch on — it's a property you design for, one backwards-compatible step at a time, using expand/contract.

• Anti-corruption layers work both ways

  21 Jul, 2026

  An anti-corruption layer is sold as a wall against a vendor's mess. It's really a double-sided socket — the same seam lets you swap either side independently.