Square’s Cash app has grown tremendously for the last few years and is currently one of the most popular mobile apps for peer-to-peer payments in the US. Originally built as a Hack Week project, it ran for a very long time on a single MySQL database.
Jon Tirsen explains how Square scaled out the backend for its Cash app using Vitess, a database middleware for MySQL built at YouTube. With hundreds of tables, thousands of different queries, hundreds of different transactions and hundreds of thousands of lines of code, the process proved quite a challenge.
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Jon Tirsen is a software engineer at Square, where he works on backend scalability issues for Square’s Cash app. Jon has been building software for more than two decades at companies such as Google and ThoughtWorks. He’s lived all over the world but has now returned to his home country, Sweden—at least for now.
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