Windows Business Management Desktop Application

I need a Windows desktop application that pulls our core business processes into one simple, professional interface that non-technical staff can use without special training. You will handle everything—from defining the database schema all the way to final testing—then hand over a fully working EXE/installer plus complete, well-commented source code. Essential modules • Finance & Accounts Management • Employee / HR Management • Sales & Customer Records • School Managemet • Data Entry and Management • User Login and Role-Based Access • Database Integration • Backup and Restore functionality Employee / HR Management must include • Payroll Management • Attendance Tracking • Performance Evaluation • Employee profile management with personal and employment details • Leave Management Key expectations • Clean, modern UI with logical navigation and quick search/filter across records • Robust print and PDF reporting throughout all modules • Reliable backup/restore routine to safeguard data • Role-based security so each user only sees what they need • Smooth installation on current Windows versions without extra configuration I am open to discussing the exact features, technology, database, timeline and budget with the selected developer.