Complex online survey
http://www.footballfanscensus.com/ - I wrote the PHP5 OO backend classes and various other code for this site to make it multi-lingual, to integrate with various external feeds, to handle the survey engine responses and produce reports on the same.
Member of AICS ([login to view URL]), agree to be bound by their Code Of Practise. Happy to sign an NDA, 10+ year qualified computing (honours) graduate Linux expert, sysadmin, and web developer. Signed up ages ago, only used this site properly since 2012. Will provide a resume to clarify if you're worried about a lack of feedback thus far.