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System Design

Reddit System Design

Prepare for Reddit’s System Design Mock Interview. Design a scalable discussion platform supporting post creation, commenting, voting, real-time feed updates, and community-based moderation.

Interview Details

Prepare to dive into a System Design Mock Interview modeled after real interview rounds at FAANG+ companies and other leading tech firms. In this session, you’ll design the architecture of a community-driven discussion platform like Reddit, focusing on scalability, real-time updates, content moderation, and dynamic feeds. The interview simulates a real System Design round, challenging you to define, design, and discuss a platform that supports millions of users while maintaining low latency and high availability. Expect a blend of conceptual reasoning, detailed technical exploration, and scenario-based challenges.

What You'll Practice:

  • Structuring and communicating end-to-end system architectures clearly.
  • Designing scalable, fault-tolerant systems for posts, comments, voting, and moderation.
  • Applying System Design principles to caching, real-time feeds, and database selection.
  • Creating clear, well-organized design diagrams that capture key components and data flow.
  • Thinking critically about trade-offs in scalability, consistency, and user experience under interview pressure.

By the end of this System Design Mock Interview, you’ll be ready to confidently tackle system design interviews for large-scale social platforms, demonstrating strong architectural thinking and decision-making skills.

Prepare to dive into a System Design Mock Interview modeled after real interview rounds at FAANG+ companies and other leading tech firms. In this session, you’ll design the architecture of a community...

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The interviewer simulates a real-world interview an adapts accordingly.

Ask for hints or clarifications if you're stuck.

50 Responses
Diagramming tool

Built to Simulate the MAANG Experience

Prep for Every Loop

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Practice explaining complex technical concepts verbally to build confidence and refine your communication skills.

Detailed Analysis

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Unlock insights that highlight your weaknesses and gives you sample responses.

Instant, Actionable Feedback

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Receive immediate, targeted guidance on solution correctness, complexity, and approach.

Interactive Environment

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Hone your coding logic in an editor and bring your system designs to life with an integrated diagramming workspace.

Tailored to Your Preferences

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Get relevant practice scenarios for your role and experience, whether you're a junior or an engineering manager.