Mandatory:

Excellent spoken English skills

Previous experience with L2 support and ticket handling

Knowledge of n-tier web applications (Webserver, app server, database, middleware)

Knowledge about e2e authentication in web communication (tokens, cookies, sso)

Experience with Java Enterprise Application Platform: Apache Tomcat, Jboss, Glassfish/Payara, Wildfly

Familiar with WEB Server Software: Apache, IIS, Proxy Servers

ITSM Suite - BMC Remedy, ServiceNow: Incident Management, Change Management, Problem Management.

Good

Linux command line skills (Bash, directory parsing)

Skills with different databases like:
LDAP, Oracle, Postgres, MySQL.

Some experience with SQL statements

Knowledge about log analysis

Knowledge about deployment processes

Proven experience with a complex system having distributed clustered component.

Nice to have:

Basic German knowledge
Deeper knowledge in a programming language
Knowledge about (TCP) networks
Good documentation skills
Java programming knowledge
Workflow automation knowledge