Enterprise Inc's evolution

The problem

Enterprise Inc had accumulated four payroll systems through acquisition, each with its own pay calendar and its own definition of a department. Consolidated labor cost took two weeks to produce and was contested every time.

The mainframe system handling 60% of headcount had one remaining person who understood it, and he was two years from retirement.

What changed

The migration ran over three quarters, one business unit at a time, with parallel runs on both systems until totals matched to the cent for two consecutive cycles.

• Seven years of historical payroll data migrated and reconciled
• Department taxonomy unified across all four legacy systems
• Parallel running for every unit before cutover — no big-bang switch
• Mainframe decommissioned four months ahead of schedule

The result

Not a single payroll run was missed or late during the migration. Consolidated labor reporting is now same-day, and post-run correction volume fell by 94%.