A payroll client/server application that developed for the public sector written in visual basic 6 and MS SQL database. The design is very open, almost all fields and calculations are user defined. Mathematical formulas are evaluated by the in-house evaluator, actually a tiny interpreter, hand crafted without the use of yacc or something similar hence they do not generate visual basic code. Finally it used the in-house report generator, with custom query layer.
This project was installed on more of 30 organizations in the public sector (municipalities, university, health sector, etc.) and was developed as contractor of Gnosis Computers.