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This is a guest post written by Claude Johnson, a Lead Site Reliability Engineer at

The following is an architectural overview of’s core platform and applications. Other systems such as Heroku's Dyno architecture or the subsystems of other products such as and are specifically not covered by this material, although is. The idea is to share with the technology community some insight about how does what it does. Any mistakes or omissions are mine.

This is by no means comprehensive but if there is interest, the author would be happy to tackle other areas of how works. is interested in being more open with the technology communities that we have not previously interacted with. Here’s to the start of “Opening the Kimono” about how we work.

Since 1999, has been singularly focused on building technologies for business that are delivered over the Internet, displacing traditional enterprise software. Our customers pay via monthly subscription to access our services anywhere, anytime through a web browser. We hope this exploration of the core architecture will be the first of many contributions to the community.

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