I'm Senior AIX administrator, on daily basics i'm supporting infrastructure over 3000 servers on AIX/Linux (CentOS,RHEL). I have experience also with ESX, XEN (also with Citrix Xen Center).
Supporting also mid-size MySQL database (up to 3TB of data), including technology:
Mysql NDB CLuster, Galera cluster, mysql replication.
More than 4 years experience in AWS (cloudformation,rds,aurora,EFS,ec2,elb,cloudfront)
As my hobby i'm also doing web develoment in PHP.