Expert knowledge of GNU/Linux Operating Systems or UNIX like. Wide experience in all distributions: Debian GNU/Linux, Ubuntu, Red Hat, Fedora Core, CentOS.
Provisioning and bootstrapping. PXE Boot, FAI, kickstart, partition, RAID, LVM, Images creation.
Virtualization and Containers. KVM, OpenVZ, VMWare, Xen, Docker. Orchestration with docker compose.
Cloud providers management: AWS console/cli, EC2, VPCs, Security Groups, RDS, ElasticCache, WAF.
Configuration management and IaC. Ansible, Terraform.
Code management and CI/CD. svn, git, GitLab pipelines.
Core Network Services: HTTP(s), FTP, SMTP, DNS, POP/IMAP, LDAP, File Servers. Apache/Nginx, PHP Systems, MySQL, PostgreSQL, Bind, PowerDNS, Postfix, Spamassassin, Dovecot, OpenLDAP, Samba, NFS.
TCP/IP Networks. VPNs, Firewalls, Routing. OpenVPN, ipsec, iptables, nftables, iproute, BGP, OSPF, QoS, VLANs, HSRP, ACLs, ipv4/6, Cisco IOSs, FRRouting.
Clusters and High Availability. Database and file replication, queries redirection, load balancing. ProxySQL, haproxy, corosync, pacemaker, heartbeat, keepalived, DRDB, unison
Advanced development in shell scripting (bash, sh), python, ruby, java, C and C++.
Backup Solutions. Custom scripts, database dumping, Bacula.
Security. Active monitoring, policies design and enforcing, incident forensics, patching, upgrading and mitigation.
Observability Systems. Time series databases, collecting agents, representation and alerting. Nagios, mrtg, collectd, munin, snmp, LibreNMS, influxDB, telegraf, grafana, ELK.
Hardware assembly (servers and desktops). Appliance Racking, power consumption calculation and sizing. Datacenter Remote Hands direction and management.
Setup of network devices. Switches(Cisco Nexus 9K, 7K, 3K) and Routers (Cisco ASR100X/Linux based). Network and telephony cabling. Cat6a, Fibres LC and MTP; 10G, 100G networks deployment. Wireless Networks.
Electronic interfaces, powerline cabling knowledge (ups, differential switches), general electronics.