Guidelines & Best practices

Refactoring -
http://martinfowler.com/bliki/OpportunisticRefactoring.html
http://www.refactoring.com/catalog/index.html

CSS Best Practices -https://developer.mozilla.org/en-US/docs/CSS/Writing_Efficient_CSS?redirectlocale=en-US&redirectslug=Writing_Efficient_CSS
https://developers.google.com/speed/docs/best-practices/rendering
http://www.onextrapixel.com/2012/05/03/css-tricks-how-to-speed-up-css-rendering/


Implement Continuous Integration (Build and Deployment)
http://www.lordofthejars.com/2012/09/deploying-jee-artifacts-with-jenkins.html

Other best practices

1. Use javadoc tags to imrpove internal documentation quality
2. Check the software aging signs are not existing
3. Exception object creation is slow so should be used carefully 
4. Jenkins best practices
5. Jenkins configuration backup plugin