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There are lot. Can you please eloborate your requirement. 
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For example I need to develop a huge tourism portal or like ebay.<br />
also accounting software.
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hi<br />
looking for professional system analysis company. any suggestions?
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hi
looking for professional system analysis company. any suggestions?

There are lot. Can you please eloborate your requirement. 

For example I need to develop a huge tourism portal or like ebay.
also accounting software.

system analysis company

Programming theory deals with the design, implementation, analysis, characterization, and classification of programming languages and their individual features, along with introductory programming concepts like program structure, variable declaration and conditional and looping constructs. Sub-disciplines include the formal semantics of programming languages, type theory, program analysis and transformation, comparative programming language analysis, metaprogramming, domain-specific languages, compiler construction and run-time systems.

Programming Theory

Web applications are systems that run in browsers that perform functions normally associated with other client-based programs. One of the most commonly used web applications is email; instead of downloading individual emails to a local machine, the data is shown through a website. Other examples of web applications are collaborative systems like a wiki or an online game.