Summary:

• Infra tools: Kubernetes, helm
• Programming: Python, Go, Ruby, javascript.
• Configuration Management: terraform, Chef, Fabric, Ansible
• Machine learning:scikit-learn
• Data systems: hadoop, hbase, hive, sqoop, elasticsearch, mongodb, couchdb, couchbase, redis
• Web UI frameworks: AngularJS, React
• OS: any linux, Mac OS, Windows