Develop Wiki-like system for songbook website

Our website uses a legacy system for content management and we want to replace it completely with a new Wiki-like system written in PHP. In the first phase we upgrade the Songbook section containing song lyrics, interpretations, guitar chords, tablatures etc. ([login to view URL]) Your task is to build a new system from scratch in a modern PHP framework (preferably Laravel). Use of existing modules (open-source or commercial) is highly recommended. Functionality of the system: - Every logged user should be able to submit new text content (lyrics) and make corrections/updates to existing content, very much like in a traditional Wiki system - All new submissions and corrections are validated by the user community and moderators - Users can post comments on new submissions and vote to approve / reject them - System should keep track of all modifications - Users should be able to compare different revisions and see the differences (diff) - Users receive "karma points" for their contributions - Each song has a title, band, lyrics content (text) and several additional metadata fields like difficulty, strumming pattern, album, year, etc. - There can be multiple interpretations of the same song - Each song can have multiple youtube videos (links) associated with it - Users should be able to add comments and rank the lyrics - System should automatially extract guitar chords from the text - Existing content has to be migrated to new database - The new system should be partially integrated with existing legacy system (user accounts) - The website needs to be SEO-friendly, this includes adding handlers for legacy URLs to preserve facebook likes etc. - Multilingual support (all the localized messages in external files) - Optimized for high performance (cache) - Search functionality with autocomplete - Admin panel with statistics - Email notifications You need to have proven experience with delivering projects of similar size. If you need more information to place your bid please don't hesitate to contact me.