High-traffic publishers, e-commerce sites, and SaaS platforms losing organic search rankings due to slow page speed or JavaScript rendering bottlenecks frequently search to hire a freelance Core Web Vitals (LCP, INP, CLS) & technical SEO programmer. I am Aldian Fazrihady, a Senior Freelance Full Stack Programmer available via Upwork.

Core Web Vitals & Technical SEO Engineering Capabilities

• Largest Contentful Paint (LCP) Optimization: Eliminating render-blocking CSS/JS, configuring `fetchpriority="high"` preload hints, serving AVIF/WebP responsive images via CDN edge caching, and implementing Server-Side Rendering (SSR).
• Interaction to Next Paint (INP) & Main-Thread Unblocking: Profiling long tasks with Chrome DevTools Performance traces, code-splitting heavy React bundles, yielding to the main thread (`scheduler.yield()`), and offloading heavy computation to Web Workers.
• Structured Data, Sitemaps & AI Search (`llms.txt`): Implementing dynamic JSON-LD (`Person`, `ProfessionalService`, `FAQPage`, `BreadcrumbList`, `Article`), automated XML sitemaps, and `/llms.txt` discovery for AI search engines.

Frequently Asked Questions