Legacy outbound file rebuilt for Payroll NA.
A legacy payroll interface had grown through years of exceptions, manual edits, and undocumented downstream rules. The conversion required more than recreating a file; it required making the business logic explicit and testable.
Challenge
- Undocumented transformation logic
- Vendor format drift from the original spec
- Manual corrections after every payroll run
Approach
- Mapped source fields to delivered Payroll NA records
- Separated eligibility, formatting, and exception rules
- Built balancing reports around file totals
Deliverable
- Production-ready interface package
- Runbook and exception handling guide
- Regression test evidence for signoff