General experience on Intersystems Iris, Cache and Ensemble, and other databases like Oracle, Mysql, Mariadb, postgresql and MongoDB.

Linux Servers Management like nginx, apache, postfix, dovecot, ansible, grafana, prometheus, bind and others.

Languages like PHP, JavaScript, Python, ObjectScript, pl/sql and other programming experiences like bash.

Deployments and administration for Kubernetes.

Cloud administration like aws, google, huawei and digitalocean.

Many opensource.

Some security tools like antimalware, waf and firewalls.