Hi,
Yii is easy! I'd be glad to finish your website that as you said has the Pinterest's functionality.
We have a huge experience in HTML5/CSS3, Java-script, Angular JS, Node JS, jQuery, Bootstrap, PHP, Yii2, Laravel, CodeIgniter, Wordpress, Opencart, Joomla and SQL databases. Please, look at our portfolio to check our programming and designer skills.
Please, let me know more information about this project. How much was done?
Regards,
Eugene