Hire a Senior Full Stack Engineer: Next.js 15, React, TypeScript, Offline-First PWAs & Real-Time WebSockets

When you hire a Senior Full Stack Engineer, you shouldn't have to coordinate between a separate frontend designer, backend API developer, and DevOps engineer to ship a single feature. I am Aldian Fazrihady, a Full Stack Engineer with 15+ years of end-to-end product delivery experience across React, Next.js 15, TypeScript, Python (Django/FastAPI), Golang, PostgreSQL, and Google Cloud / AWS.

1. End-to-End Full Stack Engineering Capabilities

• Modern React & Next.js 15 Frontend Architecture: Server Components (RSC), streaming SSR, Core Web Vitals optimization (LCP, INP, CLS), and strict TypeScript type safety across client and server boundaries.
• Accessible, High-Contrast UI & Conversion-Focused UX: WCAG AAA contrast ratios, responsive mobile-first layouts, browser back/forward history state preservation (pageshow / sessionStorage hydration), and zero-jargon checkout flows.
• Offline-First Progressive Web Apps (PWAs) & Real-Time Sync: Service Workers, IndexedDB / PGlite local persistence, CRDT conflict resolution, WebRTC video/audio diagnostics, and real-time WebSocket push notifications.
• Integrated Authentication & Global Payments: Seamless WhatsApp verification, Google OAuth, and Email/Password authentication paired with dual-currency checkout ($100 USD International Cards & IDR QRIS / Virtual Accounts).

2. Browser Back-Button & BFCache State Restoration Pattern

A common full-stack conversion leak occurs when a user clicks through to an external payment gateway and presses the browser Back button, only to find a blank form. Persisting the draft request ID in both the server session and sessionStorage—and re-hydrating on pageshow—keeps the user's exact pre-payment state intact:

window.addEventListener("pageshow", function(event) {
  var activeId = currentRequestId || sessionStorage.getItem("ods_request_id");
  if (activeId) {
    updateAuthGateUI();
    if (event.persisted) {
      fetchAndHydrateStatus(activeId);
    }
  }
});

3. What a Senior Full Stack Engineer Can Deliver in 1 Day ($100 / Rp 1,000,000)

• Build and deploy a high-converting custom landing page, interactive dashboard, or multi-step checkout flow in React / Next.js or Django.
• Implement end-to-end authentication (WhatsApp, Google Sign-In, Email/Password with AWS SES HTML emails) and payment gateway integration.
• Fix responsive mobile layout bugs, state-loss issues, or Core Web Vitals bottlenecks across frontend and backend.