Full-Stack Developer — WhatsApp Bot + Next.js Marketplace Pilot (Fixed Scope, 90 Days)

We're hiring a freelance developer for a 90-day, fixed-scope build. You'll work directly with me (the founder/CTO) — I own architecture decisions, data schema, and AI prompt tuning; you own implementation. WHAT YOU'LL BUILD WhatsApp Cloud API integration (webhooks, message handling, template messages) Data pipeline: web scraping → deduplication → PostgreSQL Multi-step conversational flow entirely inside WhatsApp chat (accepting text, voice notes, and photo replies) Voice note → transcription → LLM-based structured data extraction A matching/broadcast engine: send a request to a filtered set of recipients, collect and rank their replies Payment integration (Razorpay) gating access to specific information Simple public-facing pages (Next.js) and an internal admin/ops dashboard REQUIRED SKILLS n8n (or strong workflow-automation experience — most business logic lives here) Node.js / TypeScript WhatsApp Business Cloud API experience (must-have) PostgreSQL Comfortable integrating LLM APIs (OpenAI/Claude) and speech-to-text APIs Next.js for basic web pages Hindi reading/writing ability (end users are Hindi/Marathi speakers) SCOPE IS FIXED FOR THIS ENGAGEMENT. Additional features beyond the agreed milestone list are quoted separately — we'll walk through exact scope with shortlisted candidates before signing. HOW WE'LL WORK 5 milestones over 90 days, each with a live demo. Weekly video check-in (non-negotiable) — working screens, not status updates Written acceptance criteria per milestone, shared during the interview All code/credentials handed over in our repo; documentation required at final milestone TO APPLY Please share: (1) a project where you've used WhatsApp Business API or n8n, (2) your approach to voice-to-text + LLM extraction for a non-English language, (3) your availability over the next 90 days. Shortlisted candidates get a small paid test task before we finalize the contract, and full product details are shared under NDA at that stage.