Hi,
I'm an expert Windows database application developer with 20+ years experience in providing design, development and support services in business application software development and software add-ons for Windows.
Per your requirements, I am bidding to develop a standalone Windows desktop database software that will function both as a sales and billing software.
The software will work on all versions of Windows from Windows 7 onwards, will work on Surface Pro tablets, and will have a nice GUI with good performance.
I estimate the delivery time for the first working version of the software to be 4 weeks (1 month) or less, with delivery of frequent updates in between for your review and approval.
Good quality work done. I will also be available on the long term should you need additional modifications or support.
Thanks for considering my bid.
Best wishes,
Steve
~ Larry Anselof Technology Solutions - Providing a quality and reliable freelance software development service since 2004 ~