Harness Engineering 6 months ahead, in a few hours.

Module 14 — End-to-end project

In this module

You will build a complete project from A to Z with Claude Code: from specification with the Interview pattern through to CI/CD deployment, via architecture, tests, hooks and quality review.

This module guides you step by step through building a complete fullstack application with Claude Code. Each sub-module is a concrete stage of the project: from initialization to retrospective, you apply the techniques from previous modules to a real case. The chosen project is a REST todo-list API with a React frontend, simple enough to build in a single session, rich enough to exercise the full Claude Code arsenal.


14.1 — Project initialization

It all starts with an empty folder and three fundamental decisions: the repository structure, the content of CLAUDE.md, and the permissions in settings.json. These three elements determine the quality of everything Claude Code will produce afterwards.

Run /init in a new folder. Claude analyzes the

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