A regional financial services group needed to exit end-of-life middleware without a planned outage longer than four hours. Settlement feeds, treasury interfaces, and regulatory reporting all shared hidden dependencies.
Problem
Release windows relied on manual checklists. Three integration paths were undocumented. Failover had not been tested in fourteen months.
Approach
We mapped feeds using production trace data, split migration into four waves, and ran two full dress rehearsals with rollback timed to the minute. Identity and queue configs were validated before application cutover.
Result
Final cutover completed in the planned window. Post-migration incidents dropped 40% over the next quarter. Finance ops signed off on automated reconciliation checks that now run nightly.
This program combined migration advisory, platform hardening, and cutover command — typical for regulated transaction workloads where downtime budgets are measured in hours, not weekends.
“They treated settlement feeds as critical infrastructure — every dependency was traced before anyone touched production.”
Frequently Asked Questions
What made this cutover feasible in four hours?
Parallel running, pre-validated queue configs, timed rollback, and two full dress rehearsals with finance sign-off on reconciliation checks.
Would this approach work for real-time payments?
With stricter RPO and additional sync validation — yes, but wave design and testing windows expand accordingly.
How was regulatory reporting protected?
Reporting paths were migrated in an earlier wave with backward-compatible interfaces until final decommission.
What governance was used during cutover?
A single command centre with frozen change window, explicit rollback authority, and comms templates for internal and regulator notification if needed.