Sr. Systems Administrator Installation, configuration and maintenance of production, test and development UNIX and Windows NT/2000 servers in high-availability and loadbalancing configurations. Configuration and performance tuning of systems for Oracle, Siebel, WebMethods, Citrix and other applications. Optimize performance and specify hardware for single host and cluster environment. Troubleshoot and resolve system related problems with wide range of application installations. Configure servers for communication with IBM ESS "Shark" on a storage area network (SAN). Support for project development, test and production environment 7x24. Design and implement systems and applications monitoring based on Foglight, BigBrother and custom scripts. Design and implement centralized sendmail servers with virus scanning and SPAM filtering. Design and implement company incoming e-mail virus scanning. Troubleshoot and resolve DNS, NIS, LDAP problems. System maintenance, performance evaluation and