Payroll and timesheet module for 1C

We are looking for a developer to build a payroll and time-tracking module for our 1C-based accounting system. Our company employs around eighty people across several departments, and the current manual process for calculating salaries takes our accountant most of a week every month. We need a module that automates accrual rules, keeps the timesheet in order, and produces the reports that our management and the tax office expect without endless copying between spreadsheets.

The module should support configurable accrual rules: base salary, hourly rates, bonuses, overtime, night shifts, holiday pay, sick leave and various deductions. Each rule must be editable by an accountant without touching the code, because our pay policy changes a few times a year. The timesheet has to record planned and actual hours per employee, support several shift patterns, and reconcile with our access-control logs at the end of the month so that nobody has to enter the same number twice.

Finally, we expect a set of printable reports and an export of the calculated results into the format our bank and reporting software accept. Please describe your experience with similar 1C modules, your approach to testing the calculations on real data, and a realistic timeline. Clean, documented code and a short handover session for our staff matter to us as much as the working result.