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Building your own feature flagging system (and why it's trickier than you think)

Original: The ultimate guide to building an internal feature flagging system

May 29, 2025
44 min read
Guide
Advanced
Technology Foundations
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The ultimate guide to building an internal feature flagging system

Summary

A comprehensive guide on designing and implementing an in-house feature flagging and A/B testing platform for managing product rollouts, experiments, and user segmentation at scale.

Who This Is For

Developers
Product Managers
Analytics Engineers

Key Takeaways

  • Learn the key architectural decisions between client-side vs server-side flag evaluation and when to use each approach
  • Understand how to build SDKs that evaluate flags in under 1ms without slowing down your application
  • Master user targeting and segmentation strategies for A/B tests, canary releases, and gradual rollouts
  • Design infrastructure that handles high uptime requirements and works across edge environments
  • Build effective UI and logging systems for managing experiments and measuring feature performance

Tools & Technologies

Statsig Feature flag SDKs Database systems Edge computing infrastructure Client-side JavaScript Server-side APIs

Topics Covered

feature-flags ab-testing experimentation infrastructure deployment

Ready to dive deeper?

Read Full Article on statsig.com

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Topics

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