Design a large-scale Feed Generation Platform
Last updated: May 24, 2026
Quick Overview
Design a multi-tenant feed generation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Salesforce
May 24, 2026292
12
4,843 solved
Design a multi-tenant feed generation system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Salesforce asks this during the Onsite to assess your architectural thinking. They want to see how you decompose a complex problem, choose appropriate technologies, and reason about failure modes. Strong candidates proactively discuss monitoring, alerting, and operational concerns.
What the Interviewer Expects
- Drive the design discussion proactively with minimal interviewer guidance
- Perform detailed capacity estimation and use it to inform design decisions
- Design for global scale with multi-region deployment and data consistency
- Deep dive into 2-3 critical components with implementation-level detail
- Address complex trade-offs: CAP theorem, eventual consistency, conflict resolution
- Discuss operational excellence: deployment strategy, chaos engineering, SLOs/SLIs
- Propose a phased rollout plan from MVP to full-scale system
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 do you ensure data consistency across multiple services?
- How would you handle a region-wide outage?
- What happens if one of your database nodes goes down?
- How would you handle a 10x increase in traffic overnight?
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Requirements
Functional Requirements
- Feed Generation: The system must generate feeds for users in real-time based on activities like updates, comments, and mentions.
- Multi-Tenancy Support: The sy...
Capacity Estimation
To estimate capacity, we consider:
- User Base: Assume 10 million active users.
- Feed Generation Rate: Each user generates an average of 10 events per hour, leading to approximately 1.1 bil...
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