Headless Salesforce: An incremental migration from monolith to composable

This post details an incremental migration strategy from Salesforce Commerce Cloud to a headless architecture using Next.js and Vercel. It highlights the use of Edge Middleware for traffic control and gradual rerouting, session synchronization techniques (encrypted cookies, JWTs), SEO preservation strategies, and mitigating Salesforce API challenges through granular data fetching and caching with Incremental Static Regeneration (ISR). The post also presents performance metrics (TTFB, FCP, LCP, INP, CLS), productivity improvements (deployment/rollback times), and business impact (reduced cart abandonment, increased conversion rates, zero downtime during peak traffic).