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Openai·Frontend Engineer·Onsite - System Design / Architecture·Senior

SeniorRejected
May 2026

Summary

System design round at OpenAI for a frontend engineer role. The question was about designing the ChatGPT Playground and I thought I handled it fine, but looking back I think I was too passive the whole time and that probably cost me.

Questions Asked (1)

Q1

Design the ChatGPT Playground, covering the parameter controls, preset configurations, and both frontend and backend architecture.

System DesignTechnical Trade-offsAPI & Integrations
Author's notes

I answered everything they asked, including failure handling for server and model outages.

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AI HintsAI Generated

Suggested Approach

Start by clarifying requirements and scope, then walk through the high-level architecture covering frontend, backend, and API integration. Focus on how parameter controls and preset configurations are designed, and discuss trade-offs like state management, performance, and user experience.

Pro tip: Emphasize the importance of a responsive and intuitive UI for parameter controls, and discuss how presets can be stored and shared to enhance collaboration. Also, mention the need for real-time feedback and error handling when interacting with the API.

1. Clarify Requirements and Scope

Ask questions to understand the expected features, user base, and constraints. Define what the Playground should support, such as model selection, parameter tuning, and preset management.

2. High-Level Architecture

Outline the frontend (React/Next.js), backend (API gateway, services), and how they interact. Discuss the role of the OpenAI API and any additional backend services for presets and user data.

3. Parameter Controls Design

Detail the UI components for parameters like temperature, max tokens, and top-p. Discuss state management, validation, and how changes trigger API calls with debouncing or explicit submission.

4. Preset Configurations

Explain how presets are created, saved, and loaded. Cover storage options (localStorage, backend database), sharing mechanisms, and how presets integrate with the parameter controls.

5. Trade-offs and Optimizations

Discuss trade-offs such as client-side vs server-side state, caching strategies, and performance optimizations for a smooth user experience. Mention error handling and rate limiting.

Key Points to Mention

  • State management for parameter controls (e.g., React state, Redux, or context)
  • API integration with OpenAI endpoints, including authentication and error handling
  • Preset storage and retrieval (localStorage vs backend database)
  • Real-time feedback and loading states for API calls
  • Responsive and accessible UI design for parameter controls
  • Security considerations for API keys and user data

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