I've been working with Alex and his team for over 9 years and I've helped him and his team on multiple projects that involved a lot of different technologies and challenges. Most of the projects were hosted on dedicated and virtual infrastructure on Linux(CentOS) with LAMP/LEMP stacks. Most projects dealt with large amounts of data that had to be processed and stored in the databases while delivering content to high numbers of concurrent visitors. I've worked with Apache, MySQL, MySQL replication(master/master, master/slave), Nginx, Sphinx full text search, PHP, Memcached, Varnish, HAProxy and so on. - PixTeller: http://www.pixteller.com/ - Amazing online editor - Sunlize: http://sunlize.com/ - A startup social network - Tvchannelsfree: http://tvchannelsfree.com/ - Large collection of direct links to online TV channels stations broadcasting on the Internet. - Niuzer: http://niuzer.com - News aggregator which was processing a lot of data and served a lot of concurrent traffic - Seoanalyser: http://seoanalyser.net - On demand tool analyzer for web pages which was offering suggestions for SEO and speed improvements