Migrating Our Infrastructure from US to EU: A Complete Guide

Introduction

As data privacy regulations tighten and user expectations evolve, many companies are moving their infrastructure from US-based regions to the EU. This migration is not just a technical shift — it’s a strategic decision involving compliance, latency, and user trust.

In this article, we walk through our experience migrating our stack from the US to the EU, including challenges, solutions, and lessons learned.

Why Move from US to EU?

There are several strong reasons:

GDPR Compliance: Storing and processing data within the EU simplifies compliance. Improved Latency: Better performance for European users. Data Sovereignty: Increased trust and transparency. Regulatory Requirements: Some clients require EU-only data handling. Our Original Stack

Our initial setup was hosted entirely in US regions:

Frontend: Angular + Tailwind (CDN US-based) Database: SQL Server (US) Storage: AWS S3 (US) Authentication: OAuth providers (global) Migration Strategy

We approached the migration in phases:

1. 1Infrastructure Duplication

We replicated our entire environment in EU regions:

Azure EU (West Europe)

1. 1Database Migration

Migrated SQL Server using backup & restore Ensured data consistency and minimal downtime

1. 1API Deployment

Deployed backend services in EU Updated environment variables and endpoints

1. 1Frontend Update

Switched CDN to EU-based edge locations Updated API base URLs Key Challenges Data Consistency

Ensuring no data loss during migration required careful synchronization.

Downtime Minimization

We used a blue-green deployment strategy to avoid service interruptions.

Third-party Dependencies

Some services were still US-based, requiring:

Or legal review for compliance Performance Improvements

After migration:

📈 Faster API response times 🌍 Better global distribution using EU edge networks Lessons Learned Plan migration in phases, not all at once Audit all third-party services early Use feature flags to control rollout Monitor everything during transition Conclusion

Migrating from US to EU infrastructure is a significant step toward compliance, performance, and user trust. While it requires careful planning and execution, the long-term benefits make it a worthwhile investment.

If you're building modern applications — especially SaaS products — considering regional infrastructure is no longer optional.