As I read through your project description, I couldn't help but notice how directly aligned my skill set is with what you are seeking. Having worked extensively as a Full Stack ReactJs, NextJs, NodeJs, NestJs developer for over 8 years, I have consistently ensured top-notch UI rendering across various platforms -- precisely the kind of expertise your project demands.
My solid proficiency in ASP.NET and fixing UI rendering issues combined with astute troubleshooting skills enable me to pinpoint sources of problems and fix them quickly. I understand the impact of these issues on user experience and can assure you a swift resolution-blocking any instances where the source code is openly displayed instead of rendering correctly.
Additionally, my experience migrating websites across different host servers gives me an edge to identify any missed files or configurations which might be the root cause of the problem. With a heightened focus on JavaScript frameworks and libraries like Angular 14+, Vue/VueX, and Golang, timeline adherence without compromising quality is my USP. So let's work together to troubleshoot and resolve this issue giving your site perfect UIs again!