php-symfony developer

We have build a photo/video/audio gallery based on php-symfony and we need a developer to do the following, please price each task separately asi might go with task #2 only for now and upgrade later: 1- upgrade php-symfony to latest version to avoid being insecure of old version 2- do some browser compatibility issues on the listing page of the categories showing on iphone safari as one column instead of 3 columns (need to check other browsers too like IE etc..) any additional tasks will be discussed during the project and paid as bonus Thanks