Senior Full Stack Developer for a Restaurant CRM & Loyalty Web App (WhatsApp-centric)

Project Description I am looking for a senior full stack developer, or a small well-structured team, to build a web platform for the restaurant industry. The product will be a responsive web application with an admin dashboard, staff operational workflows, and customer engagement, loyalty, and retention logic. The main customer-facing channel will be WhatsApp, integrated with dedicated web modules. This is not a project that needs to be invented from scratch. I already have structured technical and functional documentation, including UX blueprint, recommended architecture, modules, and roadmap. Full details will only be shared with shortlisted candidates. High-level product scope customer CRM for restaurants loyalty / rewards program multi-module admin dashboard messaging campaigns and automations rewards, activities, and configuration management operational workflows for staff and backoffice modular architecture designed for future expansion Preferred stack Backend: Python + FastAPI Frontend: React / Next.js Database: PostgreSQL Modern responsive UI Experience with external APIs, event-driven workflows, and admin dashboards I am looking for someone with real experience in one or more of the following areas B2B SaaS CRM systems loyalty / rewards platforms marketing automation complex admin dashboards modular management platforms WhatsApp integrations or messaging APIs What I expect ability to work from existing specifications clean, well-structured, documented code modular and scalable approach good communication throughout the project regular progress updates willingness to work with milestone-based delivery Important For confidentiality reasons, I will not publish all product logic and differentiating features in the public job post. With the most relevant candidates, I will share a more detailed project summary and then the full technical documentation. When applying, please send: a short introduction your main stack 2 or 3 genuinely similar projects you have worked on your exact role in those projects your weekly availability how you would break this project into milestones Nice to have experience in food / hospitality tech experience with loyalty or customer retention products experience with multi-module systems production experience with FastAPI and Next.js Final note I am looking for a clear, technical, and reliable collaboration. I am not just looking for someone who can code, but for someone who can work properly on a structured product with solid logic, architecture, and medium-term vision.