Case study

Next.js App Router Migration

Migrated a React SPA to Next.js App Router to improve performance, simplify routing, and create a clearer platform for future features.

Context

The SPA had grown large enough that route-level bundles were heavy and initial load performance was inconsistent on slower connections.

The migration needed to preserve existing feature behavior while reducing complexity in data fetching and page composition.

Migrated route-by-route with parallel run support, starting with highest-traffic pages. Used server components where possible and isolated interactive areas as client components.
Moved data-fetching responsibilities closer to routes and introduced cache-safe fetch patterns to control staleness and avoid duplicated requests.
Created a migration checklist for accessibility, analytics parity, and error handling to keep quality consistent during incremental rollout.

Improved Core Web Vitals on key landing routes and reduced client bundle size.
Simplified developer onboarding with clearer route ownership and co-located data logic.
Lowered deployment risk by shipping in small increments with rollback-ready checkpoints.