please verify the letter below for any grammetical mistakes?
This is an experience certificate which i'm going to get it from my employer. I've put the content properly, how ever the letter is not in a good shape. It would be great if you can review it and modify accordingly. Thanks
************************
This is to certify that Mr. Chan was employed by ABIS Technologies as a Technical Lead from June 28, 2004 through January 13, 2011 for 40 hours per week.
During his tenure with us, Mr. Chan has worked on the various areas of Telecom Billing which includes Product development, implementation, Rating, Revenue recognition, Collections and Credit management. He has successfully served to his fullest in both analytical and technical capabilities; in software development life cycle like Analysis, Design, Configuration, Development, Code review, Testing, Deployment & Go-live and support phases for multiple projects.
Mr. Chan had worked on: Kenan 11.7, Oracle E-Business Suite 11i, WAP, C, C++, C#, HTML, WML, XML, XSL, XPath, JavaScript, UNIX, Shell Scripts, PL/SQL, .NET 1.1/2.0/3.5, ASP.NET, AJAX, ADO.NET, Microsoft Enterprise Library, LINQ, MSMQ, Web/Windows Services, MFC, STL, ATL, SQL Server 2000/2005/2008, DTS, SSIS, Oracle 8i/9i/10g, Microsoft Internet Information Services 5.6/6.0, Windows NT/2000/2003, Microsoft Visual studio 6.0, Visual Studio .NET 2003/2005/2008, Rational Clear Case, Microsoft Visual Source Safe 6.0, Microsoft Team Foundation Server 2008, Visio 2003, Rational Rose, FxCop, NUnit, SOAP UI, SQL Server Management Studio, BI Development Studio, TOAD, SQL Navigator 4.5, Oracle SQL Plus
He has performed his duties to the satisfaction of the company. #question..