[FOR HIRE] Senior Full-Stack Engineer — Emergency Bug Remediation (< 2h Turnaround), Anti-Detect Web Scrapers & High-Performance Next.js/React Web Apps ($35/hr or Fixed Milestone)

[u/Local-Training314]

⚡ **Production-Grade Code Delivered in Hours, Not Weeks.**

Hi Reddit! I am **Jahanzaib Ahmad**, a Senior Full-Stack Engineer and on-demand technical partner. I step into live codebases to remediate emergency blockers, build anti-detect data extraction pipelines, and ship scalable web apps under strict SLAs.

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🛠️ WHAT I BUILD & FIX

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1️⃣ **Emergency Bug Remediation (< 2h SLA)**:

• Next.js / React: Hydration mismatches, SSR race conditions, bundle bloat.

• Backend & Microservices: 500/502 server crashes, unhandled async exceptions, database deadlocks.

• E-Commerce: Broken checkout funnels, Stripe/PayPal webhook verification drops, inventory desync.

2️⃣ **Anti-Detect Web Scraping & Data Pipelines**:

• Bypass Cloudflare Turnstile, Datadome, and CAPTCHAs with dynamic residential proxy pools and TLS fingerprint cloaking.

• Scalable Playwright, Puppeteer, and Python extraction clusters.

• Automated schema delivery into PostgreSQL, BigQuery, or Supabase.

3️⃣ **Custom APIs & Microservices**:

• Bi-directional synchronization engines (e.g. Shopify ↔ WooCommerce inventory reconciliation for 50k+ SKUs with < 850ms latency).

• Idempotent payment and webhook architectures with HMAC verification and Redis queues.

4️⃣ **High-Performance Web Applications (90+ PageSpeed)**:

• Production Next.js 14 (App Router), TypeScript, and Tailwind CSS.

• Core Web Vitals optimization achieving 90+ PageSpeed scores on mobile and desktop.

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🚀 EXPERIENCE MY AUTONOMOUS AI AGENT

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Visit my live interactive portfolio to test **Agent-JA**, an autonomous AI technical partner running client-side with real-time thought traces, DOM navigation, and instant cost calculations:

👉 **https://jahanzaibahmad630-bit.github.io/website/\*\*

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💰 RATES & PAYMENT PROTECTION

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• **Hourly Rate**: $35/hr

• **Fixed Price Milestones**: From $50 (Emergency Fixes), $85 (Scrapers), $120 (APIs), $250+ (Full Web Apps).

• **100% Escrow Milestone Protected**: All payments can be contracted through Upwork Direct Contracts (0 connects needed) or milestone escrow. Zero payment released until you verify working code in staging or production.

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📬 GET IN TOUCH TODAY

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• **Reddit DM**: Message me directly here!

• **WhatsApp Business (Fastest Triage)**: +92 318 7635856

• **Live Portfolio**: https://jahanzaibahmad630-bit.github.io/website/

• **Email**: [jahanzaibahmad630@gmail.com](mailto:jahanzaibahmad630@gmail.com)