Today, we have David Cramer on the show. David is one of the co-founders of Sentry, an application monitoring tool that's one of the most widely-adopted tools for developers. Sentry does over 300,000 events per second on average, and there's a lot of fancy work to process these application errors, from rate limiting to fingerprinting to counting to source map unminifying. We walk through some of the architectural changes and systems design work here, including some of David's thoughts on shipping. David and Sentry also have a unique approach to developer marketing. They do some cool things -- sponsoring and then buying the amazing SyntaxFM podcast, sending $100k of free gifts to developers, and launching the Open Source Pledge with $500k donated to open source developers.