Scaling QA using just-in-time QA for Agile teams

I'm often asked how to integrate QA into sprints, especially for teams transitioning to Agile and have limited QA people (eg., 1 QA for 10 developers).

JIT (just-in-time) QA is one good way to do this. The QA acts as a consultant for the team/s and is brought in early into the process, as early as the planning stage. This also develops a QA mindset among the developers themselves as they begin programming while mindful of bugs to anticipate ("Begin with the end in mind!").

Here's how Atlassian does JIT QA: http://blogs.atlassian.com/2013/12/jira-qa-process/