How do I approach System Design interview questions?

System Design questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master system design interviews.

What difficulty level is this interview question?

This is a medium difficulty System Design question, commonly asked during Technical Screen rounds at Bobyard.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at Bobyard during technical interviews.

Design comments and async image generation

Last updated: Apr 22, 2026

Quick Overview

This question evaluates full-stack system-design competencies, including CRUD API and data-model design for sortable queries with persisted user preferences, frontend-backend synchronization, and asynchronous long-running job orchestration, status/result APIs, and UI ordering for image generation; it falls under the System Design category and tests a mix of conceptual architectural reasoning and practical application design. It is commonly asked because it probes the ability to balance scalability, consistency, user experience, and fault-tolerant asynchronous processing when designing end-to-end systems that must handle persistence, ordering guarantees, and long-running background work.

Bobyard

Apr 9, 2026, 12:00 AM

Software Engineer

Technical Screen

System Design

The system design portion combined two prompts:

Design a full-stack comment system with frontend, backend, and database support for create, read, update, and delete operations. The system should support sorting comments by timestamp or userId in ascending or descending order, and the user's sort preference should persist across page refreshes.
Design a service that generates images, where image generation can take much longer than a normal HTTP request timeout. Explain how you would accept requests, process long-running jobs asynchronously, expose status and results to users, and preserve a well-defined ordering of generated items in the user interface.

Solution

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