Vercel to AWS Amplify: Frontend Hosting Migration Guide

Introduction: Navigating the Shift from Vercel to AWS Amplify

For many SMEs, Vercel has been the gold standard for rapid frontend deployment. Its "zero-config" philosophy allows teams to ship code with remarkable speed. However, as your infrastructure requirements evolve—moving from simple static sites to complex, enterprise-grade cloud ecosystems—the constraints of a managed platform can begin to outweigh the benefits.

Transitioning from Vercel to AWS Amplify is a strategic move, not merely a technical one. While Vercel excels at developer experience (DX), AWS Amplify offers a deeper integration with the broader AWS ecosystem. This guide addresses the two primary barriers SMEs face during this migration: the fear of broken integrations and the perceived lack of internal technical expertise. By following this data-driven framework, you can mitigate risks and ensure a seamless transition.

Disclosure: This guide is independent. We do not receive commissions from AWS or Vercel for this content. Our goal is to provide objective, actionable data to support your infrastructure decisions.

Why Companies Switch: Triggers and Limitations

SMEs rarely switch infrastructure without a compelling business case. The decision to move from Vercel to Amplify is typically driven by three key factors:

1. Ecosystem Lock-in vs. AWS Integration

Vercel is optimised for Next.js and frontend-first workflows. AWS Amplify, however, provides a comprehensive suite of tools that bridge the gap between frontend and backend services (e.g., AppSync for GraphQL, Cognito for authentication, and DynamoDB for storage). If your business requires complex server-side logic or deep integration with existing AWS resources, Amplify provides a more unified control plane.

2. Cost Predictability at Scale

While Vercel’s pricing is transparent, it can become non-linear as your traffic scales or if your team size expands. AWS Amplify’s pay-as-you-go model, tied to standard AWS billing, often allows for better cost optimisation when leveraged alongside AWS Reserved Instances or Savings Plans for other backend services.

3. Compliance and Data Residency

For UK and EU-based SMEs, the ability to pin data to specific AWS regions is often a regulatory requirement. While Vercel has made strides in regionality, AWS’s mature compliance framework (ISO 27001, SOC 1/2/3) provides a granular level of control that satisfies stringent enterprise audit requirements.

Migration Risk Assessment: Managing the Transition

The migration from Vercel to AWS Amplify is considered "low risk" for most SMEs, provided you follow a structured deployment strategy.

Risk Factor	Impact Level	Mitigation Strategy
Downtime	Low	Use DNS-based traffic shifting (Route 53).
Data Loss	Minimal	Most frontend assets are stateless; database migrations are separate.
Cost Spikes	Medium	Implement AWS Budgets and Cost Explorer alerts.
Complexity	Medium	Utilise Amplify’s CLI for automated infrastructure provisioning.

The primary risk is not technical failure, but "configuration drift"—where the new environment behaves slightly differently than the old one due to misaligned environment variables or API gateway settings.

Pre-Migration Checklist: Preparing for Success

Before moving a single line of code, ensure your internal environment is ready.

Audit Current Environment Variables: Export all secrets and keys from Vercel. Document their purpose.
Golden Copy Backup: Ensure your Git repository is fully synced and tested. Tag the current production build as "v-stable".
Account Preparation: Create a dedicated AWS IAM user with programmatic access for Amplify. Avoid using the root account.
Dependency Audit: Check for Vercel-specific packages (e.g., @vercel/analytics). These will need to be replaced with AWS-native equivalents (e.g., Amazon CloudWatch RUM).
Field Mapping: Map your current Vercel rewrites and redirects to Amplify’s rewrites.json format.

Step-by-Step Migration Process

Phase 1: Pilot

Deploy a non-critical staging environment to AWS Amplify. Connect your repository and ensure the build process completes successfully. Validate that your environment variables are correctly injected.

Phase 2: Parallel Running

Keep both Vercel and Amplify environments live. Use a subdomain (e.g., beta.yourbusiness.co.uk) to test the Amplify deployment against real-world user traffic. Monitor for 404s, latency spikes, or failed API calls.

Phase 3: Full Migration

Update your DNS records in Amazon Route 53 or your existing provider. Implement a "weighted routing" policy, slowly shifting 10% of traffic to Amplify, then 50%, then 100%.

Phase 4: Post-Migration

Once you have confirmed stability, monitor your AWS CloudWatch logs for 72 hours. Only after this period should you decommission your Vercel projects to avoid unnecessary costs.

Common Pitfalls & How to Avoid Them

Hardcoded Vercel URLs: If your frontend calls its own API routes directly via Vercel-specific domains, these will break. Use relative paths or environment-injected base URLs.
Ignoring Build Time Constraints: Vercel has specific build timeout limits. Amplify has different limits. Ensure your build script is optimised to run within the standard AWS build environment timeframe.
Authentication Mismatch: If you use Vercel Authentication, you must manually migrate users to AWS Cognito or your chosen identity provider. This is the most common point of failure.

When migrating, you must ensure your data remains compliant with the UK GDPR.

Data Processing Agreements (DPA): AWS provides a standard DPA that covers the processing of personal data. Ensure you have accepted this in your AWS account settings.
Data Residency: Select an AWS region such as eu-west-2 (London) to host your static assets and backend services to ensure data sovereignty.
Right to be Forgotten: If your app stores user data in DynamoDB, ensure you have automated scripts to handle data deletion requests as per Article 17 of the UK GDPR.

Cost Breakdown: Direct, Hidden, and Cancellation

Direct Costs: AWS Amplify is free for the build and deployment tier, with costs only incurred for hosting, data transfer, and backend resources (AppSync, Lambda).
Hidden Costs: Egregious data egress fees can occur if not monitored. Ensure you use CloudFront (included with Amplify) to cache static assets effectively.
Cancellation: Vercel usually operates on a monthly or annual billing cycle. Check your contract for pro-rated refunds before cancelling your subscription.

When NOT to Switch

Do not migrate if:

You lack an AWS-certified engineer: If no one on your team understands IAM, VPCs, or CloudFront, the learning curve will be steep.
Your project is a simple static site: If your site has no backend requirements, Vercel’s simplicity is arguably superior to the configuration requirements of Amplify.
You are currently in a "code freeze" or critical launch window: Never migrate infrastructure during your company's busiest season.

FAQ

Q: Will my Next.js site break? A: Amplify supports Next.js, but you may need to adjust your next.config.js to ensure compatibility with Amplify’s build pipeline.

Q: Can I keep my domain name? A: Yes. You will simply point your DNS records (CNAME or A records) from your current provider to the new Amplify distribution.

Q: Do I need to rewrite my code? A: Minimal code changes are required, mostly related to environment variable naming conventions and specific Vercel-native SDKs.

Next Steps

Conduct a 30-minute infrastructure audit: List every Vercel-specific dependency currently in your package.json.
Establish an AWS Sandbox: Create a free-tier AWS account to familiarise your team with the Amplify console.
Consult with your team: Host a "Migration Readiness" meeting to discuss the timeline and identify potential blockers.

For further reading, refer to the AWS Amplify Official Documentation and consult with your internal IT security lead to ensure your IAM policies follow the principle of least privilege.