Job Description :
RHEL 7 admin level skill set, including performance tuning, package management tools, RHEL 7 services
AWS admin level skill set for EC2 & Storage, custom AMIs, Cloud Formation template creation
Java development skill set at a level of read, understand, modify code from existing projects
Common build tools such as maven, gradle, sbt, and make

Good to have, not required:
Go and Scala languages
NoSQL databases: Cassandra, MongoDB, MySQL, PostgreSQL at a deployment & management skillset level
Integration / automation with tools such as Jenkins

Must have:
RHEL Admin