Client notes
Comments from HR and finance teams who asked Think Service to audit payroll compliance applications—and two longer engagement stories.
They walked our overtime tables line by line and showed where Saturday night rotations were falling into the weekday premium. We had suspected it; we did not have the sample evidence until their pack arrived.
The pre-go-live check caught a leave accrual rounding difference between the old and new applications. Fixing it before cutover saved us from a month of manual corrections.
I wished the first draft had fewer annexes—our executives wanted a shorter summary—but once they added the one-page severity map, the board conversation got easier.
Our periodic reassessment after the social insurance rate change confirmed the new parameters were loaded, and flagged one allowance still using last year’s tax treatment.
Engagement story: night-shift manufacturer in Gyeonggi
A 420-person plant asked for a full payroll compliance application audit after operators reported weekend night premiums that did not match posted schedules. We sampled three closed months, including a month with consecutive public holidays. Configuration showed night differentials applying correctly on weekdays but dropping when the shift crossed into a Sunday under a custom calendar code. The findings pack ranked that gap as payday-critical. The client opened a vendor ticket with our configuration references; the following month’s parallel check confirmed the premium restored. The mild reservation from their HR lead: document requests for anonymised payslips took longer than expected because their masking process was manual.
Engagement story: professional firm preparing a version upgrade
A Seoul office of 95 employees scheduled a pre-go-live payroll system check three weeks before moving to a new major version of their payroll application. Parallel-run comparison for joiners mid-month revealed severance-related fields copying balances incorrectly for fixed-term staff. The go / no-go note recommended delaying cutover by one pay cycle. They accepted the delay; the second parallel run cleared. Finance later said the postponement was unpopular internally but preferable to correcting ninety-five payslips by hand.