Build me a payroll and loan program using codeigniter and postgresql

Hi, I want to make a payroll and loan program. The payroll program has components, namely basic, allowance, deduction and variables. Basic, allowance, deduction and variables can change dynamically. Variables can be round numbers or percent. Variables are stored in a database, variables help calculate allowance and deduction formulas. Allowance and deduction can be round numbers or formulas from variable calculations. Loan can be more than one, there is a loan that has interest and there is a loan without interest. Installments can be flat every month, or installments can be as requested by the user. Installments can enter into deductions, but installments can also not enter into deductions, installments by paying cash do not enter the payroll. The end result of payroll is payroll slip in the form of a pdf file that is encrypted password. Can be exported manually or can be sent by mail to each employee. So the scheduling of sending mail payroll slip must be made. I have created employee login and data data in the postgresql table. So you can lookup data from my table. Budget: 100-300 USD Time to complete the project: 2-4 Weeks Technology: Codeigniter & Postgresql Details of examples of payroll and loan formulas are attached in the excel file. Thank you Regards Septian