Do you fully understand my product from this picture?

I get it, but maybe the title can be even simpler:
H1: Streamline your code assessments
Subheading: Use github to etc..

copy/paste it into http://www.hemingwayapp.com/
you'll find lots to work on.

FYI: Typo... innovative.

but I'd kill every headline you have. Your subheadlines are much better.

I get it! Nice design. If you can simplify the text a little bit, would be awesome.

I'm also improving my site, keen to hear your feedback!

I understand it.

Could you share a bit about the situation a person would find themselves in where they would say "surely someone must have thought of a way to do this better?"

Because I'm sure you could start the page with a description of that crummy situation, so the visitor can say "yes, I feel understood!" and scroll down with enthusiasm.
https://sharpen.page/jtbd/copywriting/minimum-to-get-struggle-based-landing-page/