On-the-fly image resizing using Go and VIPS.
It is deployable to Heroku :D
VIPS is the fastest image resizing library. Check the benchmark here:
https://github.com/fawick/speedtest-resize#benchmark
The current implementation is Heroku-ready(TM) with custom buildpacks.
If you want to deploy to your own infrastructure, please have libvips installed properly.