Frontend Modernization

Problem

A mature React application had accumulated technical debt over years of rapid feature development. Performance degraded, the codebase was difficult to change safely, and new features took increasingly long to ship.

Context

A scaling SaaS product with a React SPA frontend, inconsistent state management patterns, and no clear component architecture strategy.

Challenges

• Large bundle sizes affecting load times
• Inconsistent patterns across feature teams
• No shared design system or component library
• Difficult to test and refactor safely
• Migration to Next.js required careful planning

Approach

Conducted a structured architecture audit, established incremental migration strategy to Next.js App Router, introduced a shared component system, and prioritized performance wins with measurable targets.

Architecture

Next.js App Router with server components where appropriate, shared UI component library, API route consolidation, incremental static regeneration for content pages, and observability for Core Web Vitals.

Implementation

Phased migration starting with leaf pages, established coding standards and ADRs, implemented bundle analysis in CI, and created a performance budget with automated monitoring.

Outcome

Improved Core Web Vitals scores, reduced bundle size, and established patterns that increased engineering velocity. The team could ship new features with greater confidence and less regression risk.

Technologies