September 4, 2026•1 min read•from InfoQ

Airbnb Cuts Authentication Code by 60% with Server Driven Architecture

Airbnb redesigned its authentication architecture around server driven flows and policy based challenge selection. The new Flexible Authentication system reduced authentication related code by 60%, cut the web client bundle by 100 KB, improved successful authentication by 2.6%, reduced duplicate account creation by 27%, and lowered OTP costs by 11%.

By Leela Kumili

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Tagged with

#Airbnb

#Authentication

#Server Driven Architecture

#Server Driven Flows

#Policy Based Challenge Selection

#Flexible Authentication

#OTP

#Account Creation

#Web Client Bundle

#Authentication Code

#Redesign

#Architecture

#Duplicate Accounts

#Cost Reduction

#Security

#User Authentication

#Client Side

#Bundle Size

#Performance

#System Design