Auth0 Tenant Migration
- 1,000+ users migrated
- Zero-downtime cutover
- AWS SSO + least privilege
Problem: Legacy Auth0 tenant had security and scalability issues.
Solution: Executed zero-downtime migration for 1,000+ users with least-privilege IAM via AWS SSO.
Impact: Zero user disruption, improved security posture, unified identity system.
Overview
Identity migration with rollback strategy and IAM alignment so security improvements don't become a customer-facing outage.
Before / after
User impact
Before: Risky big-bang migration
After: Phased, verified zero-downtime path
Decisions
Key trade-offs and design calls that shaped the final delivery.
Password hash export over force-reset
Context: Forcing password resets would damage brand reputation and create support burden—users would see 'incorrect password' errors
Decision: Worked with Auth0 executives to obtain password hashes for seamless migration—no user disruption, no password reset prompts
Board-level escalation
Context: Password hash export requires executive approval due to sensitive credential data handling
Decision: Engaged board members to secure necessary permissions—owned end-to-end from discovery through execution
Post-migration architecture review
Context: After Auth0 migration, noticed unexplained AWS Cognito API calls in billing
Decision: Deep dive revealed Auth0 was proxying to Cognito for legacy users—migrated them directly to Auth0, cut $15k/year
Architecture
The primary system boundaries, runtime pieces, and how the project was structured in production.
Legacy Auth0 (Lynks) + AWS Cognito
Source Systems
Legacy customers on Lynks Auth0 tenant, new customers on Rivafy Auth0. Hidden AWS Cognito layer discovered during migration was proxying requests and adding cost.
Auth0 Executive Engagement
Migration Coordination
Direct calls with Auth0 executives to obtain password hash export,required board-level approval due to sensitive credential data.
New Auth0 Tenant (Rivafy)
Target System
Seamless user migration without password reset prompts—users never experienced disruption or incorrect password messages.
Post-Migration AWS Review
Cost Optimization
Discovered Auth0 was fetching from Cognito for legacy users—migrated Cognito users directly to Auth0, eliminating $15k/year intermediate layer.
Pipeline
How changes moved from development through validation and deployment.
Discovery
Manual auditIdentified split tenant situation—legacy users on Lynks Auth0, new users on Rivafy Auth0
Negotiation
Auth0 executive callsSecured password hash export approval—required board-level sign-off for sensitive credential data
Migration
Custom scriptsUser data migration without password reset prompts—seamless auth continuity
Cost Review
AWS Cost ExplorerDiscovered hidden Cognito costs, migrated legacy Cognito users—saved $15k/year alone
Incidents
Operational failures, rehearsals, or recovery moments that changed how the system was run.
Split tenant discovery during rebranding
P1Resolution: End-to-end ownership including Auth0 executive calls and board escalation—password hash export approved and executed
Lesson: User-facing auth changes require executive-level coordination to avoid brand damage—don't force password resets on rebrand
Hidden Cognito proxy costs
P2Resolution: Migrated legacy Cognito users directly to Auth0, eliminated intermediate layer
Lesson: $15k/year savings from post-migration architecture review—always audit costs after major infrastructure changes