Design a Content-Addressed Photo Storage Service

Last updated: August 16, 2026

Quick Overview

Design a content-addressed photo storage service that efficiently manages photo uploads, retrievals, and storage using content-based addressing.

OpenAI
System Design
Software Engineer
OpenAI
August 16, 2026
Software Engineer
Technical Screen
System Design
Medium

5

0

46 solved


Design a content-addressed photo storage service that efficiently manages photo uploads, retrievals, and storage using content-based addressing.

This question is typically asked during the technical screen round to assess a candidate's system design skills, particularly in handling large-scale data storage solutions. The interviewer is evaluating the candidate's ability to think critically about system architecture, data consistency, and performance trade-offs in a distributed environment.

What the Interviewer Expects
  • Discuss requirements for the photo storage service, including scalability and durability.
  • Outline a high-level architecture that includes components like storage, indexing, and retrieval systems.
  • Identify potential challenges such as data consistency, redundancy, and latency.
  • Dive into specific technologies or frameworks that could be used for implementation.
  • Consider trade-offs between different design choices and scalability options.
Key Topics to Cover
System Architecture
Data Storage
Content Addressing
Scalability
Performance Trade-offs
How to Approach This
  1. Start by clarifying functional and non-functional requirements with the interviewer.
  2. Estimate the scale: QPS, storage, bandwidth. This drives your design decisions.
  3. Draw a high-level architecture first, then deep dive into 1-2 critical components.
  4. Discuss trade-offs explicitly (e.g., consistency vs availability, SQL vs NoSQL).
  5. Address failure scenarios, monitoring, and how the system handles 10x traffic spikes.
Possible Follow-up Questions
  • How would you handle data redundancy in your design?
  • What strategies would you implement for ensuring data consistency?
  • How would you scale the service to accommodate millions of users?
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Sample Answer
Requirements

To design a content-addressed photo storage service, we need to consider several key requirements:

  1. Scalability: The service should handle a large number of users and photos, scaling horizontal...
High-Level Design

The high-level architecture of the photo storage service can be broken down into several components:

  • Upload Service: Handles incoming photo uploads, generating a unique content hash for each ph...

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