My preferred stack is:

• Ruby and Ruby on Rails
• Python and Django
• Hadoop/Spark/Hive/Airflow/HDFS/HBase
• C, C++, Objective-C, and Swift
• Oracle, MySQL, PostgreSQL, Redis
• Vagrant
• Docker
• CentOS

Contact me at jerzygangi.com. Read my coding notes at notes.jerzygangi.com.