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? ```hint Use the diagram to support a story Follow one request through the components before zooming into the subsystem you owned. ``` ### What a Strong Answer Covers - A concise technical explanation supported by a simple, accurate diagram. - A deep dive that distinguishes individual work from team decisions. - Alternatives, interfaces, validation, and lessons grounded in the project. ### Follow-up Questions - Which arrow in the diagram represents the most fragile dependency? - What changes when that dependency is unavailable?