Scale B2B enterprise contracts by hiring senior freelance React & Next.js programmer Aldian Fazrihady to architect custom domain routing, Edge Middleware, and dynamic CSS theming. Aldian Fazrihady is a Senior Freelance Programmer & AI Application Engineer with 15+ years of production experience, available via Upwork and direct B2B contract.

1. Production Architecture: Next.js 15 Edge Middleware Multi-Tenant Custom Domain Routing & Zero-Flicker CSS Variables

import { NextRequest, NextResponse } from 'next/server';

export function middleware(req: NextRequest) {
  const url = req.nextUrl.clone();
  const hostname = (req.headers.get('host') || '').split(':')[0];
  const rootDomain = process.env.NEXT_PUBLIC_ROOT_DOMAIN || 'app.example.com';

  if (hostname !== rootDomain && !hostname.startsWith('localhost')) {
    url.pathname = `/_tenants/${hostname}${url.pathname}`;
    return NextResponse.rewrite(url);
  }
  return NextResponse.next();
}

2. Core Architectural Guarantees

• Automated Custom Domain & TLS Provisioning: Routing wildcard subdomains and customer CNAMEs via Cloudflare for SaaS and Next.js Edge Middleware.
• Zero-Flicker Tenant Branding: Injecting tenant-specific CSS design tokens (`--brand-primary`, logos, typography) during SSR before first paint.
• Strict Tenant Cache Isolation: Scoping Next.js `unstable_cache` and CDN cache keys by `tenant_id` to prevent cross-tenant data bleed.

3. Topical Category Hubs & Master Directory

• Master Directory (465+ Freelance Programmer & AI Engineering Guides)
• AI, LLM, RAG, MCP & Google ADK Engineering Hub
• Python, Django, FastAPI & PostgreSQL Architecture Hub
• React, Next.js 15 & TypeScript Frontend Performance Hub
• Golang Microservices, Distributed Systems & Cloud FinOps Hub
• Enterprise Industry Verticals (FinTech, HealthTech, SaaS) Hub