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Companies / Reddit

Reddit interview questions

Explore questions associated with Reddit. Review the source details, then use the workspace for code, notes, and diagrams.

18 questions in the library. A source association does not guarantee a future interview question.

Behavioral and leadership · Machine learning · ML system design · Object-oriented design · Product and business · System design

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20 questions

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System designMedium
Design an Agent for BigQuery Analysis
Companies: Reddit
System Design
Last reported Oct 2026
Open workspace
System designMedium
Design a notification system
Async processing with durable queues, per-channel isolation, retries/DLQ, at-least-once + idempotency, outbox, priorities.
Companies: Reddit, Airbnb, Amazon, Autodesk +24
async-processing · idempotency · outbox-pattern · queues
Last reported Oct 2026
Start AI interview Study workspace
ML system designMedium
Design a Comment-Likelihood Prediction System with a Focus on Feature and Model Serving

Companies: Reddit

ML System Design

Last reported Sep 2026

Product and businessDifficulty not specified

Redesign a Legacy Keyword Search into a Modern Typeahead Experience

Redesign a legacy keyword-based search experience to support a modern typeahead input with real-time results and recent search history, while addressing UX improvements…

Companies: Reddit

Last reported Aug 2026

Behavioral and leadershipDifficulty not specified

Describe one thing you have learned recently

Companies: Reddit, Google, Meta, Microsoft

Last reported Jul 2026

Behavioral and leadershipDifficulty not specified

Give me an example of a tough or critical piece of feedback you received.

Companies: Reddit, Airbnb, Amazon, Anthropic +14

Last reported Jul 2026

Behavioral and leadershipDifficulty not specified

How do you use AI in your work or personal projects?

Companies: Reddit, Amazon, Bloomberg, Capital One +3

Last reported Jul 2026

Behavioral and leadershipDifficulty not specified

Tell me about a project you worked on and what your role was

Companies: Reddit, Arize Ai, Bloomberg

Last reported Jul 2026

Object-oriented designDifficulty not specified

Design a Circuit Breaker

Design a low-level circuit breaker system for managing API calls to external dependencies, supporting three states (CLOSED, OPEN, HALF_OPEN) with configurable failure…

Companies: Reddit, Microsoft

Last reported Jul 2026

Behavioral and leadershipDifficulty not specified

Tell me about your most challenging project

Companies: Reddit, Amazon, Anduril, Assort +9

Last reported Jul 2026

ML system designMedium

Design Comment Prediction Ranking System

Companies: Reddit

ML System Design

Last reported Jun 2026

ML system designHard

Design comment ranking

Companies: Reddit

ML System Design

Last reported Mar 2026

ML system designMedium

Design a video recommendation system

Companies: Reddit

ML System Design · Observability · Recommendation Systems

Last reported Feb 2026

System designDifficulty not specified

Design a News Aggregator System

Design a news aggregation system like Google News that allows users to subscribe to different news sources, categories, and topics, then view a personalized real-time…

Companies: Reddit, Amazon, Atlassian, Google +6

Last reported Dec 2025

System designDifficulty not specified

Design a historic 'hot' posts page

Design a system that displays the most popular Reddit posts from any given day in history, where users can query by date using 'YYYY-MM-DD' format…

Companies: Reddit

Last reported Mar 2025

Machine learningMedium

Analyze CTR Data and Train Model

Companies: Reddit

CTR Prediction & Ads ML · Supervised Learning

System designHard

Design a BigQuery analytics agent

Natural-language analytics over BigQuery: grounding SQL in business meaning, enforcing user permissions, controlling query costs, and recovering long-running tool calls.

Companies: Reddit

agent-orchestration · text-to-sql · data-access-control · query-planning

Start AI interview Study workspace

System designHard

Design an existing ML prediction service redesign

Diagnose an existing inference service, control overload, keep features fresh through zone failures, and migrate models and feature schemas safely.

Companies: Reddit

ml-serving · capacity-planning · backpressure · caching

Start AI interview Study workspace

Machine learningHard

Explain and Reduce Position Bias in Ranking

Companies: Reddit

Model Evaluation · Ranking Models

Machine learningMedium

Model y from x and interpret distributions

Companies: Reddit

Model Monitoring & Drift · Supervised Learning

Reddit interview questions | SysRound