Frontend Lead & AI Developer @ Chronicler Labs
Muhammad Hassan
Verified
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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
47
Timeline
Jan 31, 2025 - Sep 16, 2025
Clients
Chronicler
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