This is great! With Ghidra I had to look for the corresponding libs of a very specific RiscV vendor, your SRE did it by itself. You should have your own HN thread in front page!

What kind of file should be uploaded?

The allowed types are a bit misleading. Any binary is accepted, any architecture. You can upload shared objects, ELF executables, PE binaries, etc.

I like to give it bomb executables (reverse engineering challenges) to test it.

> Any binary is accepted, any architecture.

One should be careful tossing around the word "any" in relation to executable formats, for there are seemingly an unbounded number of them: https://github.com/1Password/onepassword-sdk-go/blob/v0.1.5/...

Up to you, but currently your polling endpoint just has a boolean, which is likely super easy to cook on the server side but also leads the user left wondering "uh, is this thing on?" in ways that any kind of percentage might not. IOW, how long, exactly, should any sane person wait for it to be {"status":true}?

Also, you have your ELB misconfigured because trying to upload a binary that is takes more than 30 seconds to upload causes the actual POST to puke. I'm sure that's great for hello-world.exe but is absolutely hilarious for any real binary