Yesp StudioConfidential · Enterprise Pharma
A clean cut-over with zero audit findings and a 60% lower run-the-business cost.
GxP systems on an end-of-life mainframe with regulatory deadlines closing in.
Context, scope, and success criteria
The organization was running GxP systems on an end-of-life mainframe, and the modernization program had to complete before regulatory deadlines closed the window. Any solution had to preserve auditability, protect validated workflows, and avoid operational disruption.
- Migrate validated workloads without compliance risk or loss of historical traceability.
- Reduce run-the-business costs and platform fragility across the core platform estate.
- Ensure safe cut-over with rollback protections and explicit validation checkpoints.
- Preserve the operating model required by regulated teams during the transition.
Why the work started
GxP systems on an end-of-life mainframe with regulatory deadlines closing in.
What we built
A strangler-fig modernization over 22 months with validated migration of each subsystem.
Legacy versus modern flow
An end-of-life mainframe estate with validated workflows, high operating cost, and significant operational fragility.
A phased modernization path that preserved validation, separated critical workloads, and reduced total run-cost while keeping compliance controls intact.
How the work was executed
Designed a subsystem-by-subsystem migration plan with validation checkpoints aligned to regulated processes.
Ran parallel validation and automated reconciliation across legacy and target environments.
Executed phased cutovers with controlled rollback windows and documented approvals.
Retired mainframe dependencies only after downstream consumers had completed acceptance testing.
Controls and delivery rhythm
Program governance aligned engineering, compliance, and QA checkpoints throughout migration waves, with documented sign-off at each cut-over milestone.
The organization modernized critical systems with full audit confidence and materially lower operating cost, while reducing the fragility of the underlying platform estate.
Results and next steps
A clean cut-over with zero audit findings and a 60% lower run-the-business cost.
Current focus is extending modernization benefits into advanced analytics, AI-enabled operations, and additional validated workflows.
Have similar architecture bottlenecks?
We can map the same modernization pattern to your infrastructure, release process, and operating model.