Custom ERP for 20-Employee Firm

My firm has grown to 20 staff members and our current mix of spreadsheets and single-purpose apps can’t keep up. I need a unified ERP that pulls everything together—Accounting & Finance, Human Resources,... (Budget: ₹75000 - ₹150000 INR, Jobs: Accounting, Database Management, ERP, Excel, Odoo, PHP, Software Architecture, Web Development)