Design a Feature Flag for SentinelOne
Last updated: August 19, 2025
Quick Overview
Design a high-throughput feature flag system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
SentinelOne
August 19, 202532
5
4,590 solved
Design a high-throughput feature flag system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This is a common system design question asked during System Design Round at SentinelOne. 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. SentinelOne 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
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 schema migrations with zero downtime?
- How would you optimize costs as the system scales?
- How would you migrate from a monolithic to a microservices architecture?
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Requirements
Functional Requirements:
- Feature Flag Management: Ability to create, update, delete, and retrieve feature flags.
- User Segmentation: Support for targeting specific user segments based...
Capacity Estimation
Assuming SentinelOne has 10 million active users and each user session makes an average of 5 flag checks per minute:
- Total QPS: [ 10,000,000 , users \times 5 , checks/user/min \div 60 , ...
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