2026
Legacy system replacement
Replacing a 1983 DOS system for a long-established Munich company
The legacy system: BASIC from 1983, over 500 source files, data in hand-managed binary files. Reconstructed byte by byte, rebuilt as a Python desktop app on SQLite, accounting logic 1:1 after the original. In production on several machines.
- DOS/BASIC seit 1983
- 32 Parser
- 45.000 Zeilen Python
- 487 Tests
- Python
- PySide6
- SQLite
- PyInstaller
Modules: addresses, delivery notes, invoices, receivables, payables, dunning, stock, accounting, reports, journal, documents · June to August 2026 · several workstations