Design a large-scale Messaging Platform
Last updated: July 23, 2025
Quick Overview
Design a scalable messaging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Supabase
System Design
Product Manager
Supabase
July 23, 2025Product Manager
Onsite
System Design
Medium
449
9
4,600 solved
Design a scalable messaging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This is a common system design question asked during Onsite at Supabase. The interviewer expects you to demonstrate your ability to design large-scale distributed systems, make well-reasoned trade-offs, and communicate your thought process clearly. Supabase values engineers who can think about scalability from day one.
What the Interviewer Expects
- Systematically gather requirements and estimate capacity (QPS, storage, bandwidth)
- Design a scalable architecture with clear component responsibilities
- Make well-reasoned database and caching decisions with trade-off analysis
- Address consistency vs availability trade-offs specific to the use case
- Discuss partitioning strategy, replication, and data modeling
- Cover failure handling, monitoring, and alerting strategies
Key Topics to Cover
Failure handling and fault tolerance
Database selection and data modeling
Load balancing and horizontal scaling
High-level architecture and component design
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 optimize costs as the system scales?
- How would you migrate from a monolithic to a microservices architecture?
- How do you ensure data consistency across multiple services?
- How would you handle a region-wide outage?
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Requirements
Functional Requirements
- User Registration and Authentication: Users must be able to register, log in, and manage their profiles.
- Messaging: Real-time sending and receiving of messages, i...
Capacity Estimation
Back-of-Envelope Calculations
- User Base: Targeting 10 million active users.
- Messages Per User: Assuming an average user sends 10 messages per day, that's 100 million messages daily.
- **...
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