Custom SEO Optimization Plugin

I’m looking for a WordPress developer who can create a lean, well-documented plugin that focuses purely on SEO optimisation. The core of the build is two features: real-time keyword analysis and in-editor content optimisation. I will supply the exact list of themes that the plugin must play nicely with; stability and clean integration with their page builders are essential.

What I expect as deliverables:
• An installable plugin (.zip) coded to WordPress standards and free of deprecated functions
• Keyword analysis module that suggests, scores and stores focus keywords per post/page
• Content optimisation panel that grades readability, heading use and meta data before publish
• Tested compatibility with the specific themes I’ll provide, along with a short report of results
• Brief user guide and inline code comments for future maintenance

If you have already built similar SEO-centric plugins or modules, please mention them when you respond and note any open-source repos I can review. Clean code, security best practices and minimal performance impact will decide the hire.