Finance ERP App Development

I need an ERP application focused entirely on finance management and I want it to feel seamless on both desktop and mobile devices. The core of the system must cover invoicing and billing, accurate expense tracking, plus solid budgeting and forecasting functions that can scale as my operation grows... (Budget: ₹600 - ₹1500 INR, Jobs: Accounting, Budgeting and Forecasting, ERP, Finance, Inventory Management, Invoicing, Mobile App Development, Payroll HR S&E, Web Development, Windows Desktop)