Skip to main content
📜 WAYPOINT LESSON

Checkpoint: Architecture

⭐⭐ intermediate⏳ 15 min read📍 Lesson 109 of 180

Graded checkpoint: a complete repo→service→controller flow with validation, DTO mapping, and state transitions.

Checkpoint — architecture

You can now: assemble layered systems with a composition root, expose DTOs at boundaries, and extract collaborators until god classes dissolve. Prove it with a full three-layer mini-stack.