I will fix react and nextjs bugs and optimize performance

Your site works. It's just slow, broken on mobile, or throwing an error you can't pin down.

I find the actual cause, fix it properly, and send a short report so the bug doesn't come back next sprint.

WHAT I FIX

• React / Next.js errors: hydration mismatches, hook bugs, build failures, blank pages, 500s
• Responsive breakage: overflow, broken grids, navs and modals on real devices
• Performance: Core Web Vitals LCP, CLS, INP, bundle size, image and font loading
• API integration: REST/GraphQL calls, CORS, auth tokens, webhooks, error states
• State bugs: forms, filters, pagination, caching, stale data
• Accessibility: focus traps, labels, contrast, keyboard paths
• Third-party breakage: Stripe, Supabase, Firebase, maps, analytics

HOW IT WORKS

1. You send the URL, repo access and the exact symptom.
2. I reproduce it, then confirm scope and price in the order chat.
3. You get the fix on a branch, a root-cause summary and a retest checklist.

No full rewrites unless you ask. Each fix is warrantied if it regresses inside the window, I fix it free.

Send your error text and steps to reproduce. I'll tell you honestly whether it's a 30-minute fix or a rebuild.