I am curious what the going rate for advanced technical writing is.

I tend to understand code by reading descriptions of algorithms and trying to implement them myself.

This usually involves having a critical insight into what the code does. Such as the category of problem the algorithm is.

Reading code and understanding an existing codebase is difficult and takes a long period of time.

I had the book open source architectures but I never finished that book due to illness.

There was a deep dive into the .NET CLR[1] but I want to see the cost of commissioning deep dives into the code of things such as LuaJIT, JVM, PyPy, Chromium V8, Postgresql, OpenTTD.

[1]: https://mattwarren.org/2017/02/07/The-68-things-the-CLR-does-before-executing-a-single-line-of-your-code/