# How to plan a successful composable commerce migration **Author:** Vercel --- Composable commerce lets you migrate away from monolithic ecommerce platforms one slice at a time, keeping your backend intact while modernizing the frontend. This guide covers the migration strategies, team structure, SEO considerations, and API design decisions that reduce risk throughout the process. ## Keep your commerce engine, replace what isn't working The migration focuses on the frontend layer while preserving backend data infrastructure. Your commerce platform maintains responsibility for customer information, product details, inventory management, and similar core functions, while the presentation layer becomes independent and flexible. After migration, you can choose best-in-class solutions for each part of your architecture rather than remaining locked into a single provider's ecosystem. Common choices include: - **Commerce backends**: Shopify, BigCommerce, commercetools, Salesforce Commerce Cloud - **Content management**: Contentful, Sanity, Storyblok - **Search**: Algolia, Elasticsearch - **Payments**: Stripe, Adyen ## Migrate one slice at a time **Incremental vertical migration** means moving features one at a time instead of replacing the entire system at once. This approach provides several advantages: - Continued feature development on both migrated and legacy components - Flexible timeline with ability to pause migration when needed - Real-world testing before full rollout - Selective user exposure for validation - Simple rollback capability if issues arise Traffic during migration routes through a reverse proxy using feature flags to gradually direct users to new pages. ## Form a small core migration team A dedicated team of 3–5 technical experts should manage the migration while other departments contribute code as their modules reach migration readiness. These specialists must combine technical expertise with strong communication skills, establishing clear timelines and comprehensive documentation. ## Plan for SEO Maintain existing URL structures and metadata to preserve search engine recognition. During the transition: - **Use proper redirect types**: 301 redirects for permanent moves, 302 for temporary testing phases - **Set canonical tags during feature flagging**: When running A/B tests between old and new pages, set the canonical tag to point to your preferred version. This prevents Google from indexing both variants and splitting page authority. - **Avoid long-running A/B tests**: Google may treat extended A/B tests as cloaking (showing different content to users vs. crawlers), which can trigger penalties. Limit tests to the shortest duration needed for statistical significance, and ensure Googlebot sees the same experience as users. - **Monitor Google Search Console**: Watch for crawl errors, indexing issues, and ranking changes throughout the migration - **Expect temporary fluctuations**: Rankings may shift during transition but should stabilize once migration completes ## Craft a great API ### Security Implement unique API keys for frontend authentication and use OAuth 2.0 when handling sensitive customer data. Most ecommerce platforms provide built-in OAuth functionality. ### RESTful vs. GraphQL RESTful APIs work well for many ecommerce applications because they scale well and are simpler for developers to work with. GraphQL is a better fit for highly dynamic applications where the frontend needs to control exactly which fields are fetched at query time. ### Structure Model endpoints around resources (`/products`, `/orders`, `/customers`), not frontend pages. If a single page needs data from three endpoints, it's better than building one endpoint per page that couples your API to your UI. Find a middle ground on granularity. Too few endpoints force clients to overfetch fields they don't need. Too many endpoints create maintenance burden and make the API harder to learn. Start with one endpoint per resource and split only when clients consistently need a subset of fields. Version your API from day one. Prefix routes with `/v1/` so you can introduce breaking changes in `/v2/` without disrupting existing consumers. ### Documentation Prioritize clarity and readability. Include sample requests, responses, and code snippets for practical guidance. Use tools like [OpenAPI](https://www.openapis.org/) for autogenerated documentation linked to source code. ## Understand business costs Even a well-planned incremental migration has costs. Plan for: - Budget flexibility across CAPEX and OPEX structures - Temporarily increased infrastructure costs while running both systems - Cross-domain expertise requirements across legacy and new architectures - Comprehensive testing to ensure feature parity - SEO timeline constraints on migration phases ## The path forward A successful migration requires: - Prioritizing high-impact migration slices - Selecting scalable JavaScript frameworks - Empowering core migration teams with clear processes - Proactively managing SEO redirects and canonical tags - Building a secure, well-documented API foundation The transition demands commitment, but the result is a more adaptable ecommerce setup that isn't tied to a single vendor's roadmap. --- [View full KB sitemap](/kb/sitemap.md)