Full-Stack Developer for Health-Tech Platform

We are seeking a skilled full-stack developer to complete our WhatsApp health-tech platform. The project involves integrating a WhatsApp chatbot with a PostgreSQL database and a React frontend. The ideal candidate will have experience in Node.js, React, and PostgreSQL, and be able to deliver a high-quality solution within a short timeframe. This is a part-time engagement with a duration of 1 to 3 months. HALI is a women's health navigation platform built for the Kenyan market. We help professional women aged 35–55 understand symptoms related to perimenopause, menopause, hormones, and metabolic health, and connect them to a licensed Clinician Navigator (a women's GP), lab testing, and ongoing care. All delivered through WhatsApp. We have a working prototype built in Replit (React + Node.js + PostgreSQL) and need an experienced developer to take it from its current state to a production-ready beta by 1 September 2026. The codebase is clean, the architecture is sound, and the hard thinking is already done. Your job is to complete the build, not design it from scratch.