We have gone through your requirement for "Point of Sale Software" - and we have created similar application in past in WPF Technology. Please do private message and will share screenshot for the same.
We have proficiency in Desktop, Website and Mobile application Development and have worked on many complex projects as your can see in our portfolio. You can also see our portfolio to know about my/our expertise in Software Development. Please provide more details about your requirement.
Our Technology Experience
Software Technologies: C#, VB.NET, WPF, WCF, Crystal Reports, Windows Services, Windows Form,
Web Development Technologies: ASP.NET Web Form, ASP.NET Razor/MVC, Bootstrap, JQuery, HTML5, Web Service
Mobile app Development: Windows Phone apps, Windows 8 apps
Database: SQL Server, PostgreSQL, MySQL, SQLite