Systems:* Linux (Debian, RedHat, CentOS)* Solaris (Solaris 10, 11.1 x86/SPARC, OpenSolaris)* FreeBSDManagement and deploying:* SMTP / IMAP / POP3 (Postfix, Exim, QMail, Dovecot, SpamAssassin)* A good knowledge Zimbra Enterprise* A good knowledge of FreeIPAv3 / RHDS* A good knowledge of optimalization, performance and scalability applications and systems* HTTP / HTTPS (Apache2, Nginx)* VPN (OpenVPN, ipsec)* DNS (bind, powerdns)* GIT and SVN* Load balancing (HAProxy, Balance, Varnish)* Systems monitoring (nagios, zabbix, cacti, własne rozwiązania)* Storage (NFS3/4, iSCSI, ZFS Storage Pools oraz NetApp FAS)* Expirience with data hosting (SaaS, Paas, Web Hosting, Cloud)* Expirience with security management and implementation (PCI DSS, ISO 27001), a good knowledge of security technology (SELinux, OSSEC, HIDS, IPS, IDS)Administering, management and implementation of databases* Performance and availability monitoring* Access control* A very good knowledge of MySQL Database* A good knowledge of MySQL monitoring (MySQL Enterprise Monitor, Zabbix, Cacti)* Administering and implementation Oracle Database 11g (OEM/RAC/RMAN/ASM)Management and implementation of virtualization * Administering and implementation KVM, OpenVZ, ESX (Linux)* Basic skill with Sun LDOM, a very good knowledge of Sun Solaris Zones* Designing and implement virtualization environment * Monitoring performance and availabilityProgramming:* Expirience with perl programming (a lot of software)* Linux application programming in C/Perl* Linux Kernel Programming (LKM)Hardware knowledge:* IBM X Series, IBM BladeCenter, Dell, Sun* NetApp FASProgramming languages:* C, Perl, Bash - medium skill* SQL, PL/SQL, PHP - basic skill