Who is using `immer`?

With roughly two million downloads per months, there must be a lot of big and small companies using this package. Please share your success stories!

1. Which company?
2. Logo would be cool! (it implies that it is o.k. to publicly share that your company is using this project, otherwise leave it out)
3. What kind of project? How large? (code base size or team size)
4. If your project is open source or public, please share a link!

If you would consider providing long term support through donations that would be great! Open collective or Paypal (please mention immer in the comments both cases)