Everyday, we would decide with the client on what we would be building. We would show the designs to them and get a sign off or mark any changes and it would straight go to development.
We took a micro-service approach where each developer could independently work on their module as all communication were through pre-defined API calls.
We delivered the project with more than the12 bullet points defined in the requirements gathering document in 12 weeks. Bridj raised their series A funding and was valued at $60M USD a few weeks after the launch.