Hillary for America was arguably one of 2016’s largest startups. It was in the news every day, raised billions of dollars, and grew at an incredibly fast rate. There was even a very splashy exit. But what isn’t often talked about is the technical infrastructure behind it. Over the course of 18 months, HFA tech’s SRE team built and ran an immutable infrastructure, supporting a tech org that started with one developer and grew to 80, letting people deploy hundreds of times a day, with little to no downtime. In this talk Michael will explore how the campaign systematically approached every design decision to stay true to immutable principles, leveraging AWS infrastructure along with open source technology like Packer, Ansible, Consul, and a healthy dose of Varnish.