Design a Font Management and Rendering System
Last updated: April 5, 2025
Quick Overview
Design a system that manages thousands of fonts, handles font licensing, and ensures consistent text rendering across Canva's web, mobile, and export pipelines.
Canva
April 5, 20257
6
1,856 solved
Design a system that manages thousands of fonts, handles font licensing, and ensures consistent text rendering across Canva's web, mobile, and export pipelines.
Font management is a surprisingly complex challenge at Canva's scale. The system must serve thousands of fonts to 260M+ users with fast load times, ensure consistent rendering between browser preview and exported files, handle font licensing compliance, and support internationalization with complex scripts.
What the Interviewer Expects
- Design a font catalog and delivery system with lazy loading
- Ensure rendering consistency between client-side preview and server-side export
- Handle font subsetting for efficient delivery and embedding
- Manage font licensing compliance at scale
- Support complex text layout for CJK, Arabic, Devanagari, and other scripts
Key Topics to Cover
How to Approach This
- Start by clarifying functional and non-functional requirements with the interviewer.
- Estimate the scale: QPS, storage, bandwidth. This drives your design decisions.
- Draw a high-level architecture first, then deep dive into 1-2 critical components.
- Discuss trade-offs explicitly (e.g., consistency vs availability, SQL vs NoSQL).
- Address failure scenarios, monitoring, and how the system handles 10x traffic spikes.
Possible Follow-up Questions
- How would you handle a font update that changes glyph metrics, potentially breaking existing designs?
- How would you support user-uploaded custom fonts safely?
- How would you optimize initial page load when the user's design uses multiple fonts?
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Requirements
Functional Requirements:
- Font Catalog: Manage thousands of fonts including WOFF2 and variable fonts, categorized by style, license, and language support.
- Lazy Loading: Implement lazy...
Capacity Estimation
Assuming Canva has over 260 million users, we estimate:
- Daily Active Users (DAU): Approximately 10% or 26 million users.
- Concurrent Users: Peak usage might see around 5% or 1.3 million con...
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