Explain a Project with a Diagram and Deep Dive into Your Design

Explain a previous engineering project to another engineer using a simple diagram, then take a technical deep dive into its design and the part you personally owned.

Part 1 — Communicate the System

State the problem and draw or describe a small component-and-data-flow diagram. Explain one representative request or workflow through it.

What This Part Should Cover

Clear component responsibilities, meaningful arrows, and enough context for someone unfamiliar with the project.

Part 2 — Examine the Design and Your Contribution

Discuss an important design choice, alternatives, the implementation of your component, and how it interacted with the rest of the system.

What This Part Should Cover

Personal ownership, technical detail, failure behavior, and evidence that the design met its requirements.

Constraints

Use a real project with accurate facts. Simplify or anonymize confidential details while preserving the technical relationships. No particular architecture or technology is required, and an invented example must be labeled hypothetical.

Clarifying Questions

• What background does the audience have, and which part should receive the most detail?
• Is the focus the original design decision, a later change, or operational behavior?