• Here's the github link to their repo

It's written by heavyweights like Boyd himself, the author of the famous convex optmization textbook and course.

╰─$ cloc .     343 text files.     329 unique files.     163 files ignored.---------------------Language         code---------------------C                6483C/C++ Header     3215CMake            1930make             1506Python            701C++               496JSON              232Markdown          213Bourne Shell      186DOS Batch         140CSS               121YAML              105HTML               19---------------------SUM:            15347---------------------

I find it amazing that all of the code lives in around 6500 lines. They're supposedly industrial strength, and can handle large problems. Reading this code should provide a lot of insight into how to write good convex optimizers! I would love to take a course which explains the source code.