Finishing the UI takes a long time

Things look simple when you get the wireframes. backend coding also does not take much time. But when it comes to UI there is no end in sight. Creating a polished UI takes a lot of time. The kind of things that you need to do

• Error validations. Empty fields, numeric validation, email format etc. I personally do not like doing validations in server scripts only. it is double the work if you want to do validations in javascripts as well as server scripts.
• Make sure every font and font size is perfect.
  
• All the navigation links should work  otherwise integration with the rest of the system would break.
  
• Complex UI would have role based rendering. So you need show different UI to different type of users
  
• Correct handling of data returned from server.
  

It can be frustating when you work on your UI for 3 days and people come back with hundreds of comments. But then that is part and parcel of developing an application.

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