Php 4/5 - Strong knowledge of php programming MySql databases - Strong knowledge of MySql and relational databases - MySql database design,optimizing schemas, queries and indexes - Working with large MySql databases - Partitioning Replication topologies (master-slave, master-master) - Replication delay solutions NoSQL - Memcache - instalation, usage & configuration - Redis - instalation, usage & configuration Javascript - DOM scripting, event handling - Creating reusable code - Ajax, jQuery, Scriptacul