How can I integrate a blogging system into my React.js website?

I have a website built with React.js, and I want to integrate a blogging system into it. My primary goal is to maintain a consistent user interface (UI) throughout my website and ensure that the blogs are SEO-friendly. I don't want to host the blog on a separate domain because that would disrupt the brand consistency of my website's design. I'm aware of different ways to write blogs, but I want a solution that seamlessly blends into my existing website. Many SaaS businesses successfully include a blogging feature in their websites while maintaining brand consistency, and I want to achieve something similar. Could you guide me on how to integrate a blogging system into my React.js website, covering both the user interface and how to ensure the blogs are optimized for SEO? I’d also appreciate details about how to create a robust interface for writing, managing, and displaying blogs effectively.