We have about 2 terabytes of data in MySQL and MongoDB. We use Rails on JRuby to run over a million transactions for our customers every day. Our typical response times are 1-2 seconds for a basket of products and we maintain uptimes north of 99.99%.
Our environment
* Ruby on Rails currently at 4.2, moving to 5.1
* Git/GitHub repository, Jira for ticket tracking/scrum sprints and GitHub for code reviews.
* 1:1 test coverage for most of the codebase and 2:1 for prime areas. Work closely with QA team.
* Mac laptops provided for development
* Jenkins for continuous integration, deploy to dual hot data centers
by via developer jobs - Stack Overflow
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