atom VS haxl

Atom and Copilot for using Haskell to generate C for microcontrollers.

There seems to be a little more information on its github page: https://github.com/tomahawkins/atom

Eaton is a manufacturer of electrical and hydraulic equipment, as well as components for the aviation and automotive sectors. The company is using Haskell for day-to-day tasks such as scripting, hardware simulation, remote control tools for vehicle systems, etc. However, the most interesting thing is that they have entrusted hydraulic elements to the control of code written in Atom DSL, which is also implemented in Haskell. Atom is used to develop hard real-time systems and allows describing declaratively the system state transition rules. During compilation, the tasks are scheduled, which is why the resulting code has a deterministic execution time and constant memory consumption. This makes verification of the obtained code much easier and generally increases the system security, which is, of course, very important in this subject domain. You can read about all this in more detail on the slides and in the Atom repository.

Do you use atom or some other free software framework for generating the firmware?

Sounds a bit like Haxl. From this page:

+1. The JS event loop auto-monad-izing Promises into Haxl [1]-esqe trees of implicitly-batched loads has been a big win for us building on JavaScript/TypeScript.

If I had to move to another language, I'd really want to find a "powered by the event loop / dataloader" framework, i.e. Vert.x for Java.

Also, per dataloader, a shameless plug for our ORM that has dataloader de-N+1-ing built natively into all object graph traversals:

https://joist-orm.io/docs/goals/avoiding-n-plus-1s

[1]: https://github.com/facebook/Haxl

and Haxl

Haxl, a framework for efficient and concise data fetching.

You mean, Haxl? [1] But AFAIK only a few devs are involved for the development.

[1] https://github.com/facebook/Haxl

Probably, the most googled and well-known example of Haskell application in major companies is the Facebook Meta spam filters. Messages containing spam, links to potential malware and phishing attacks are filtered by Sigma, the system that was rewritten in Haskell in 2015. The choice of language was based, among other things, on performance requirements, the need for pure functions and static typing, as well as the possibility of interactive development. The Haxl framework is used under the bonnet, which the company has open-sourced. You can find more details about the development process and technical aspects in the company’s blog post.

Their GitHub still seems pretty active https://github.com/facebook/Haxl

Since you mention Any real-world application uses a database or seventeen in the backend, it's probably worth checking out https://github.com/facebook/Haxl as its goal is to allow you to write high-level queries in Haskell and have the library call out to different datasources as efficiently as possible.