This is a half-day version of the SRE Classroom event that has been run at other USENIX conferences in 2013 and 2014. It won't include much in the way of formal presentations, as previous SRE Classroom events have done. We expect this event to appeal to senior and experienced engineers. The workshop problem will be a real-world large-scale engineering problem that requires some distributed-systems knowhow to tackle. Attendees will work in groups with Googlers on the problem, trying to come up with: A high-level design that scales horizontally Initial SLIs, SLOs Estimates for hardware required to run each component If time permits, monitoring design and disaster testing scenarios Attendees will be provided with a workbook that guides them through tackling a problem like this, with some worked examples, so junior attendees should be able to make progress and learn too.