We are building a custom web application called RentNest — a WhatsApp-first rent reminder & tenant management system for PGs, hostels, and apartment owners in India. This is NOT a WordPress project This is NOT a no-code project This is NOT an accounting or payment gateway app The product logic, workflows, and edge cases are fully documented in a FINAL PRD. What the Product Does (Short & Clear) Helps PG/hostel owners track paid / unpaid tenants Sends automated WhatsApp rent reminders Handles payment delays, extensions, absconded tenants Uses photo-based dashboards (no tables) Owners manually mark payments System never touches money (no GST, no payment gateway) Strong legal & identity safety features Documentation Status (IMPORTANT) FINAL PRD available (v4.1 frozen) Full idea journey document available UI & workflow visual prompt available You will NOT design the logic — you will build exactly what is documented. Technical Requirements Required Full-stack development experience REST API experience WhatsApp Business API integration (official) Experience with background jobs / schedulers Secure file storage (documents, photos) Suggested Tech Stack (flexible) Frontend: React / Next.js / Vue Backend: Node.js / Django / Laravel DB: PostgreSQL / MySQL WhatsApp API: Meta / approved provider Hosting: AWS / GCP / DigitalOcean You must explain why you choose a stack. What This Project Will NOT Use WordPress Bubble / Glide / No-Code tools Unofficial WhatsApp tools Payment gateways GST / accounting modules Tenant mobile app If you suggest these → we will not proceed. Key Functional Areas You Will Build OTP login (mobile only) Tenant onboarding (photo + ID docs) Aadhaar front & back image upload Photo-based tenant dashboard Reason-based payment status system WhatsApp reminder scheduler Payment extension & discipline logic Owner manual pause (emergency) Month switch (read-only history) System activity log Owner rent overview (live + WhatsApp PDF) Legal record PDF generation Exit / abscond handling Security & Ownership (NON-NEGOTIABLE) NDA required before full PRD sharing Source code ownership = Client Domain, server, WhatsApp API = Client Milestone-based payments only