I build a focused, working feature for a B2B web application using React, Python, Django REST Framework, and PostgreSQL. We start by choosing one core user workflow and agreeing on the screens, API behavior, data model, acceptance criteria, and access needed. The one-week scope covers that agreed feature plus a technical handoff; a complete multi-module product, complex integrations, and production operations need a separate proposal and timeline. Share your users, current app or idea, and the first workflow you need. I will confirm the deliverables, schedule, and quote before development starts.