We are looking to hire an experienced full-stack developer or development team to build a niche-focused SaaS platform designed specifically for real estate agencies. The platform will automate lead capture, follow-ups, and appointment booking using WhatsApp automation and AI-driven workflows. This will be a multi-tenant, subscription-based cloud SaaS product where multiple real estate businesses can log in, manage their leads, track conversions, and automate communication from a centralized dashboard. The primary goal is to help agencies increase booked site visits and improve lead-to-sale conversion rates through intelligent automation. The system must capture leads automatically from Facebook Lead Ads and Google Lead Forms via webhooks, store them in a structured pipeline, and trigger automated WhatsApp and email follow-up sequences. It should include a simple but powerful CRM dashboard with lead stages, tagging, lead scoring, and performance tracking. The platform must also support appointment booking with calendar integration, automated confirmations, and reminder messages. A visual or rule-based automation workflow builder is preferred so users can customize follow-up sequences easily. The preferred tech stack includes Node.js or NestJS for backend, React.js or Next.js for frontend, PostgreSQL for database management, and Redis for handling automation queues and triggers. WhatsApp Cloud API integration is required for messaging automation, and Stripe should be integrated for subscription billing with plan-based feature restrictions. The architecture must be multi-tenant, secure, scalable, and cloud-deployable (AWS or DigitalOcean preferred), with the ability to scale to 500+ active clients. The project will be delivered in phases over approximately 8–12 weeks. Phase one should include authentication, role-based access, lead management, and basic WhatsApp automation. Phase two should implement appointment booking, advanced automation workflows, and subscription billing. Phase three will focus on AI-based reply suggestions, advanced analytics dashboards, and performance optimization. We are looking for a developer with prior SaaS or CRM development experience, strong API integration skills, and the ability to build clean, scalable, production-ready architecture.