How Square Stays Stable and Available

Confreaks has an excellent collection of 2012 Airbnb Tech Talks, including this great presentation from Erica Kwan on how mobile payment platform Square stays up and stable. It's well worth a look:

As Square has grown, the methods used to ensure users can always take payments have evolved. We've refined the processes used to develop and deploy services, started using a variety of monitoring tools, and created a comprehensive, service-based on-call rotation.

I'll give an overview of all of these and discuss how Square's engineering team has adapted over the past two and a half years to support both internal and external users.