MediaMarkt — multi-year legacy replacement
200+ legacy processes documented, 100+ change requests, 6+ months parallel-run pilot. 25% rework reduction, 30% fewer escalations.
Context
A multi-year programme to replace legacy retail systems. The hard part was not the technology — it was capturing what the legacy actually did before turning anything off.
Approach
- Documented 200+ legacy processes before any cutover work began.
- Managed 100+ change requests through analysis and release.
- Ran a 6+ months parallel-run pilot in a production store — old and new systems live in parallel, with reconciliation and a controlled rollback path.
- Reconciliation rules and acceptance criteria written down up front, not negotiated after defects appeared.
Outcome
- 25% reduction in rework on the new platform versus baseline.
- 30% fewer escalations post-cutover.
- A documented legacy estate that survived the programme, not just its result.
Full write-up pending — tracking content polish in BAS-7.