Frontend Lead & AI Developer @ Chronicler Labs by Muhammad HassanFrontend Lead & AI Developer @ Chronicler Labs by Muhammad Hassan

Frontend Lead & AI Developer @ Chronicler Labs

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Muhammad Hassan

Muhammad Hassan

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Started as Frontend Lead with role later expanded to Full stack & AI capabilities.

Technical Diagram

What I Built

Built production WhatsApp AI agent from ground up alongside ex-Meta and ex-WhatsApp engineers.

Frontend Development

Complete website: Figma → Next.js, React, TypeScript, Tailwind CSS
Server-side rendering, responsive design, pixel-perfect implementation

Backend & AI Orchestration

Next.js Server Actions + Temporal Workflows for reliable message processing
Multi-provider AI (Claude, GPT, Gemini) with RAG and vector database
WhatsApp Business API: voice transcription, image captions, quick replies, link scraping

Database Architecture

Supabase PostgreSQL with Row-Level Security policies
Query optimization, indexing, schema design
Handled 1000+ concurrent users during viral launch

Integrations & Automation

OAuth (NextAuth), multiple user roles
Google Calendar 2-way sync via webhooks
Cron jobs for scheduled tasks and cleanup
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The Viral Launch

Our WhatsApp AI agent went viral - 300K+ impressions overnight.
As the solo frontend engineer who'd expanded to full-stack, I watched every system I built get stress-tested in real-time. Database queries handling 10x expected load. Temporal workflows processing thousands of messages. RLS policies routing new users every second.
Then bugs appeared. Frontend issues, timeouts, workflow hiccups.
Full firefighting mode: Find bug → Fix → Test → Deploy. Repeat. No downtime. Every architectural decision from months earlier either saved me or taught me a lesson.
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Impact

✓ Bugs fixed same day as reported ✓ 1000+ concurrent users handled smoothly ✓ "Exceeds Expectations" performance ratings ✓ 2 promotions in 6 months ✓ Worked with ex-Meta & ex-WhatsApp engineers
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Tech Stack

Frontend: Next.js 14 • React • TypeScript • Tailwind CSS Backend: Next.js Server Actions • Temporal Workflows Database: Supabase PostgreSQL • RLS • Query Optimization AI: Multi-provider (Claude, GPT, Gemini) • RAG • Vector DB Infrastructure: WhatsApp Business API • NextAuth • Webhooks • Vercel Cron
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What the client had to say

Hassan is an efficient engineer capable of independently carrying out projects with little oversight. Would definitely recommend again for future projects!

David Tsui, Chronicler

Sep 21, 2025, Client

Posted Sep 8, 2025

Led frontend development and helped build full stack WhatsApp AI agent for Chronicler Labs. Developed Temporal workflows + Meta API integration for automation.

Likes

1

Views

63

Timeline

Jan 31, 2025 - Sep 16, 2025

Clients

Chronicler