I have hands on experience in
Jenkins – Automation server, with plugins built for developing CI/ CD pipelines
Git and GitHub – Source code management
Linux servers(Debian, Ubuntu, RedHat, CentOS), FreeBSD, Solaris, Mac OS, Windows servers and Desktop.
Web-hosting (Apache, Nginx, MySQL, IIS etc)
Databases MySQL, MariaDB, MongoDB, PostgreSQL, MsSQL
FTP-servers Pure-FTPd, ProFTPd
develop scripts and tools with using Python, bash
Cloud Computing Amazon AWS: EC2, VPC, S3, ELB, SES; Google Cloud, Digital Ocean
Cloud Computing Kubernetes, Docker
Development Tools Coverity, Bugzilla, Protecode, Jira, Fisheye
Programming: Bash, Perl, Python, C/C++, PHP, Java, JavaScript
Management services Puppet, Chef, Ansible, Teraform
administration of Virtualization like XenServer, VMware ESXi, Virtualbox
administration of network services SSL Certificate, Spam & Antivirius protection, NAT, VPN, Firewalls, Load balancers, IP Routing, OpenVPN, PowerDNS, DHCP, DNS, NFS, FTP, SAMBA, SNMP, SSH