GetAccept (YC W16) is an e-signature tool with document tracking and smart sales automation. Before launching our platform at the end of 2015 we spent months researching and working to configure the perfect hosting environment for our SaaS application. We aimed for 100% application uptime and full redundancy on all layers. 18 months into the business we have kept to our goal–not a single second of downtime and no service windows. Here’s the configuration we used.