Experience creating servers with high loads.
Deep knowledge of Unix-like systems.
The introduction of systems for the collection and analysis of statistics: Awstats, Sawmill
Maintenance and tuning forks and Mysql, postgresql, Oracle (1 year)
search machine: Sphinx search organization for cash registers (POS) terminals, websites.
Caching system: memcached, apc, eaccelerator, varnish
Reference system virtualization: Xen
Load distribution (load balancing) Bind (round robin algorithm), HAproxy (balancing requests to Wowza, load balancing between nodes)
Streaming servers (wowza).
Monitoring system: cacti, munin, nagios, zabbix
Understanding and experience of the construction of high load systems.
Knowledge of writing sql queries, query optimization.
Load testing of web applications
Load testing tools: tsung, siege