Yes! Our infrastructure uses the world-renowned and highly-regarded Amazon Web Service (AWS).
Amazon is one of the world's largest providers of hosting software; they spend massive resources on security and conduct ongoing risk and security assessments. In the web world, they're the safety standard.
Data is stored and processed in the US by our sub-suppliers and sub-processors, Amazon and Heroku (Salesforce). Both of these companies are Privacy Shield-certified, so the transfer of data to them complies with EU law. We do not use any other sub-suppliers outside the EU/EEA-area.
For the more technical types out there, our servers are accredited under ISO 27001.
If you would like a more in-depth look at Amazon's security policies, we absolutely encourage you to have a look here: https://aws.amazon.com/security/