Accountancy Software

Can you build a complete program in python or an alternative language. Database to handle accountancy type entries and various reports. Will include typical data entry edit windows such as Suppliers Ledger, Sales Ledger, Bank Reconciliation, Support different currencies. Inputs. manual entry of bills and batch copy & paste. Sales invoices generation. Reporting: various pre-defined types, ability to custom own reports, seeing reports on screen, printing, pdf, export to excel. You will have some knowledge of how accountancy systems work. Password protection. Multi-user. I am open to your architectural suggestions. The program to be bespoke around my specifications, but generally on the lines of Quickbooks. The program will be ghostwritten-the copyright will belong to the client. Work will start only when Agreement/NDA is signed. Contract price is fixed to be paid on completion and client satisfaction.