You might be interested in Tachyon https://github.com/humanmade/tachyon-plugin, an image resizing service built to be used with Amazon S3 as the image backend, AWS Lambda (or any node.js server) to process images using sharp, and sits behind a CDN such as CloudFront or CloudFlare.
Disclaimer: my employer (but I don’t work on the project).
Disclaimer: my employer (but I don’t work on the project).