Build a scalable Feature Flag Pipeline
Last updated: June 7, 2026
Quick Overview
Design a scalable feature flag system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Salesforce
June 7, 2026340
12
2,984 solved
Design a scalable feature flag system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Salesforce asks this during the System Design Round 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
- 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
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
- What would the deployment pipeline look like for this system?
- What monitoring and alerting would you set up on day one?
- What happens if one of your database nodes goes down?
- How would you migrate from a monolithic to a microservices architecture?
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Requirements
Functional Requirements
- Feature Management: Enable the creation, updating, and deletion of feature flags by authorized users.
- User Targeting: Support targeting specific user segments...
Capacity Estimation
Capacity Estimation
Assuming Salesforce has approximately 1 million active users:
- Requests per Second (QPS): If each user generates an average of 10 flag checks per minute, we have:
- 1,00...
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