Migrate your legacy app to Next.js / React!

Julian Valle Garcia

Starting at

1,500

/wk

About this service

Summary

I help businesses modernize legacy web applications by migrating them to React or Next.js, creating faster, scalable, and maintainable front-end architectures. With experience in complex codebases and seamless API integrations, I ensure your new application preserves functionality while improving performance and developer efficiency.

Process

1. Discovery & Assessment – 1–2 days

Review codebase structure, dependencies, and pain points

Identify critical components and tricky areas

2. Migration Planning – 1–2 days

Create a step-by-step migration strategy

Define milestones and deliverables

3. Component & Page Migration – 1–3 weeks

Rewrite front-end components and pages

Implement routing, state management, and UI patterns

Timeline depends on number of components/pages

4. API Integration & Functionality Testing – 3–5 days

Connect the new front-end to existing APIs

Test forms, data flows, authentication, and edge cases

5. Documentation & Handoff – 1–2 days

Set up Storybook and developer documentation

Provide guidance for ongoing maintenance

What's included

Codebase Assessment & Migration Plan
Review your existing application Identify components, pages, and dependencies to migrate Create a step-by-step migration strategy
Component & Page Migration to React/Next.js
Rewrite front-end components in React or Next.js Implement routing, state management, and UI patterns Ensure functional parity with your legacy application
API Integration & Backend Connectivity
Connect the new front-end to your existing backend APIs Handle data fetching, forms, and authentication Ensure smooth data flow and performance
Optional: Documentation & Developer Handoff
Setup Storybook for UI components Provide clear documentation for future maintenance Guidance for your team on best practices

Skills and tools

Frontend Engineer

Software Engineer

Fullstack Engineer