UNLESS is a trade name of Rocket Launcher (international trademarks pending). Rocket Launcher is a company registered at the Chamber of Commerce in Amsterdam, The Netherlands, under registration number 65190645 .
Rocket Launcher was started by Marcel Panse and Sander Nagtegaal, as the holding company for their brand Unless. Read more about Unless here.
The website is built with ReactJs and Google's Material Design Lite, using the excellent React components wrapper for MDL by Tommy Leunen. The underlying UNLESS service uses S3, Cloudfront, Amazon API Gateway, Lambda functions and DynamoDb. These are all services offered by Amazon Web Services. The serverless architecture has been documented here.