#Node.js

• Statsig Under the Hood: A Deep Dive into Internal Architecture and Implementation

  21 min read • Published on April 15, 2024 • Last Updated On August 6, 2025

  Statsig is a unified experimentation platform that combines feature flags, A/B testing, and product analytics into a single, cohesive system. This post explores the internal architecture, SDK integration patterns, and implementation strategies for both browser and server-side environments.TLDR• Unified Platform: Statsig integrates feature flags, experimentation, and analytics through a single data pipeline, eliminating data silos and ensuring statistical integrity• Dual SDK Architecture: Server SDKs download full config specs and evaluate locally (sub-1ms), while client SDKs receive pre-evaluated results during initialization• Deterministic Assignment: SHA-256 hashing with unique salts ensures consistent user bucketing across platforms and sessions• High-Performance Design: Global CDN distribution for configs, multi-stage event pipeline for durability, and hybrid data processing (Spark + BigQuery)• Flexible Deployment: Supports cloud-hosted, warehouse-native, and hybrid models for different compliance and data sovereignty requirements• Advanced Caching: Sophisticated caching strategies including bootstrap initialization, local storage, and edge integration patterns• Override System: Multi-layered override capabilities for development, testing, and debugging workflows

• Authentication, Authorization, and Access Control

  15 min read • Published on April 1, 2023

  An in-depth technical analysis of AAA frameworks for expert practitioners, exploring modern authentication mechanisms, authorization models, access control paradigms, and their implementation patterns with Node.js examples.