Amazon·Software Engineer·Technical Phone Screen·Intermediate

Intermediate

Apr 2026

Summary

Amazon SWE interview with a frontend component design question. Pretty straightforward on the surface but there's more to it than just slapping some divs together.

Questions Asked (1)

Design and implement a reusable dialog component that has a background color, title, close button, and action buttons.

System DesignTechnical Trade-offsAPI & Integrations

Author's notes

My first instinct was to just build a functional modal and call it done.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the requirements and constraints, then outline the component's API and state management. Discuss implementation details, including styling, accessibility, and reusability, and finally cover testing and trade-offs.

Pro tip: Emphasize accessibility (keyboard navigation, ARIA roles) and composability, as these are often overlooked but critical for reusable components in production.

1. Clarify Requirements

Ask questions to understand the expected behavior, such as whether the dialog should be modal, support animations, or be controlled/uncontrolled. Confirm the target framework (e.g., React, Vue) and styling approach.

2. Define the API

Specify the component's props/inputs: background color, title, close button visibility, action buttons (labels, callbacks, variants), and any additional customization points. Consider using slots or render props for flexibility.

3. Design State Management

Decide how the dialog's open/close state is managed (internal state vs. controlled by parent). Handle side effects like focus trapping, body scroll locking, and escape key handling.

4. Implement Component

Write the component code, ensuring proper styling (e.g., CSS-in-JS, CSS modules), accessibility (ARIA roles, keyboard navigation), and reusability (no hardcoded content). Use composition for action buttons.

5. Test and Iterate

Outline testing strategies: unit tests for rendering and interactions, accessibility tests, and visual regression tests. Discuss trade-offs like performance vs. flexibility and how to document usage.

Key Points to Mention

Accessibility: ARIA roles (dialog, aria-modal), focus management, keyboard support (Esc to close, Tab trapping).
Reusability: Props for customization, slots/render props for action buttons, avoiding hardcoded styles.
State management: Controlled vs. uncontrolled component, handling open/close state, and side effects.
Styling: Theming, background color prop, CSS-in-JS or CSS modules, and ensuring style encapsulation.
Testing: Unit tests with React Testing Library, accessibility audits, and visual regression tests.
Trade-offs: Flexibility vs. simplicity, performance implications of re-renders, and bundle size considerations.

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.