Stores massive data, distributed among many different clusters.
Tasks in parallel are run by Storm.
Data retrieval and analysis of Cassandra.
Distributed caching for different applications to use.
Relational content, such as user data, posts, logs and other relevant but not so heavy data. Consumed by web servers.
We still use Vagrant, but Otto will replace it soon.
bytelore.com makes extensive use of Java in its applications. We use Java due to its performance, community and the number of other projects built in the language. We have many projects and libraries built in Java.
bytelore.com is built with Bootstrap 4, taking full advantage of Twitter's impressive HTML/CSS/JS framework.
We're using a 100% Ember application in our main website, bytelore.com, after we decided to refactor it.