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Legacy System Migration
Done Right
Move from outdated systems to a fast, flexible, and future-proof architecture.
MIGRATE FROM LEGACY SYSTEM TODAY
Use our expertise to bring your app to modern tech stack.
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Who Needs
Legacy System Migration?
When your current setup slows every release or blocks new ideas, it’s time for a change.
We'll help you move from fragile legacy systems to modern, scalable architectures that support faster delivery and long-term growth.
Outdated Front-End or CMS Systems
Teams using WordPress, Drupal, Joomla, or custom CMS setups often struggle with performance, SEO, and stability. Migration to Next.js + Sanity offers better load times and content management.
Common challenges:
Poor Core Web Vitals and SEO drops
Slow, fragile content updates
Limited scalability
See how we helped:
Localcoin – Migrated from WordPress to Next.js, delivering a lighter site with improved Core Web Vitals and easier publishing.
Green Custard – Rebuilt the website with Sanity to simplify content management and enable real-time previews for the team.
Medium & Large Web Platforms
Growing digital products and content-heavy sites need more scalability and flexibility.
A migration to Next.js and Sanity enables faster updates, better integrations, and lower costs.
Common challenges:
Slow feature delivery
UX limitations from old frameworks
Costly and rigid infrastructure
See how we helped:
Colony – Modernized the React.js front end to improve usability and created a smoother user experience based on real user feedback.
Learn Squared – Moved the site from Drupal 7 to Next.js + Sanity, cutting bounce rate and increasing revenue by 24% within 26 days of launch.
Teams Slowed by Legacy Architecture
Legacy systems hinder innovation and make release cycles painful.
Our legacy migration service helps teams remove technical debt, adopt modern workflows, and restore development velocity.
Common challenges:
Hard-to-maintain legacy code
Long release cycles and slow fixes
High maintenance costs
See how we helped:
GPnotebook – Rebuilt one of UK's biggest medical platforms with Next.js + Sanity, improving performance by around 70%, and lowering costs.
Proofed – Developed a secure React/Next.js platform with automated workflows and a middleware layer that improved collaboration.
Does your platform fit one of these cases?
Check Our
Legacy System Migrations
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GPnotebook
Scaling a 100K+ Page Medical Platform with Next.js & Sanity
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Localcoin
Migrating Wordpress Website to Jamstack for the financial technology company.
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Learn Squared
Migrating an outdated e-learning platform from Drupal to Jamstack
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Green Custard
Building Super-fast Jamstack Website for Advanced Partner of AWS.
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Colony
UX and UI Overhaul of Blockchain's App with React.js
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Proofed
MVP development for the leading professional proofreading and editing services company
Legacy App Modernization
& Migration Services
Platform Migration & Replatforming
Migrate from WordPress, Drupal, or custom CMS setups to a Next.js + Sanity headless architecture built for scalability. We also handle migrations from Webflow, Wix, or Gatsby to modern Next.js solutions with a plan that preserves your content, data, and SEO.
Mobile Platform Migration
Legacy mobile apps can be just as limiting as old web systems. We use Expo and React Native to replatform native iOS and Android apps or extend existing web platforms into mobile, all with shared code and a modern workflow.
Front-End Codebase Modernization
Our front-end modernization experts help teams upgrade from JavaScript to TypeScript, move class components to React Hooks, and migrate from AngularJS, jQuery, or legacy React to modern Next.js. Each update is paired with performance improvements like code splitting, lazy loading, and stronger Core Web Vitals.
UI/UX Modernization & Front-End Revamps
Modern UX starts with a fast, responsive interface that’s easy to maintain. We rebuild front-ends with modern component libraries, improve accessibility (WCAG), and focus on real performance gains, so every page hits 100% green Core Web Vitals.
Headless Architecture & Integration
Modernizing from a monolithic setup makes it easier to scale, integrate, and adapt. We design headless, API-first architectures with Sanity CMS, RESTful or GraphQL integrations, and multi-channel content delivery for web, mobile, and beyond.
Consulting & Support
Modernization starts with the right plan. Our front-end migration consulting helps you set a clear roadmap, choose the right tech stack, and understand what needs to change in your current setup.
After launch, the partnership continues with ongoing maintenance, team training, and fast support.
Our Migration
Approach
A successful migration starts with a clear plan and the right technical partner. We support companies at every stage of their modernization journey to make each migration predictable and technically sound.
1
Project Charter
At first, we focus on defining your project vision, goals, and business context to align technical execution with business outcomes.
2
Audit & Analysis
Once we are on the same page, our team examines your existing stack, data structure, and hosting setup to find dependencies and potential migration risks.
3
Planning & Roadmap
Next, CTO & CDO outline the new architecture, select the optimal tech stack, and set priorities for phased or full migration.
4
Platform Migration
We deliver work in a few focused 2-week sprints, minimizing downtime while validating the value and stability of your platform.
5
Release & Support
After migration goes live, we complete deployment, SEO validation, and data checks to ensure everything runs as expected. You’ll also receive a full month of support, with our team resolving any post-migration issues at no extra cost.
Our
Toolkit
We went on a technical efficiency mission with several tools that we consider perfectly matched. And yet, our front end developers are hungry enough to learn, adapt and discover more.
Design
Develop with
Deploy to
When to Migrate
from a Legacy Setup
Every system has a breaking point. Maybe it’s slowing your releases, blocking integrations, or costing more to maintain than it should.
Here’s how to recognize when your legacy setup is holding you back, and what can be done about it.
The Challenge | Our Solution |
You’re spending more time fixing than building | Front-end codebase modernization replaces legacy code with a clean, modular setup. Your team can shift from maintenance to meaningful development. |
Performance and SEO keep dropping | Front-end performance optimization services ensure faster load times and stability, backed by our Work Until Green guarantee of 100% green Core Web Vitals. |
Your tech stack can’t handle new integrations | Headless architecture and API-first integrations make your product flexible, composable, and ready for new technologies. |
Your CMS frustrates your content team | Sanity CMS migration delivers real-time collaboration, structured content, and a smooth editorial experience. |
Hiring or onboarding developers is getting harder | TypeScript migration and React modernization make your codebase easier to maintain, test, and scale. |
Mobile experiences lag | Expo and React Native replatforming unifies your app under one codebase, speeding up delivery and reducing maintenance. |
Not sure how to migrate your legacy setup?
Follow our tested migration plan
Why Choose
Pagepro?
We aim to provide a great experience and ensure the entire development process is frictionless. We prioritize clear communication and careful project management to deliver results that meet all your expectations.
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Proven Next.js, Sanity & Expo Expertise
We’ve spent years building and migrating systems with these technologies. Our deep and narrow expertise means faster onboarding, fewer surprises, and a modern stack that scales across web and mobile.
Starter-Accelerated Development
We’ve built internal starters and pre-tested components that speed up delivery by up to 30% compared to building from scratch. You get faster results, consistent quality, and clean, maintainable code ready for long-term growth.
Connectors & Migration Scripts
Our in-house migration tools and connectors make even complex transitions simple. Each script is carefully planned, mapped, and tested to ensure reliable, error-free migration to modern infrastructure.
Focus on UX & Performance
We design every migration around performance and usability. From lightning-fast front-ends to intuitive CMS workflows, our approach improves Core Web Vitals and makes content management effortless for your team.
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Pagepro exhibited strong execution. They understood our technical goals and our desired performance metric. They were also very detail-oriented, and helped us achieve the KPIs we set for the project, including a lighter website, increased speed, and better SEO ranking.
That’s an underrated skill that Pagepro has. They are able to simplify things. They’ve been quick, and they always deliver at the end of each two-week sprint. On top of that, the quality was excellent from the first time.
Pagepro was excellent from a project management perspective, thanks to their budget flexibility and timely adherence to our deadlines.
Pagepro in Numbers
200+
Projects Done
15
Years in Business
4.9/5
Clutch.co Rate
40
Team Members
92%
Client Retention Ratio
Frequently Asked Questions
What is a legacy system?
A legacy system is an old application or platform that still supports daily operations but relies on outdated code, frameworks, or infrastructure.
These systems often limit scalability, slow development, and increase security and maintenance costs.How to identify legacy systems?
You may be running a legacy system if:
Your tech stack uses outdated or unsupported frameworks.
Updates or new features take weeks or months to release.
Performance, Core Web Vitals, or security audits consistently fail.
Most of your development budget goes to maintenance instead of innovation.
A legacy system migration consulting session can help confirm whether a full or partial modernization is needed.
What is legacy system migration?
Legacy system migration is the process of moving software, data, and infrastructure from outdated technology to a modern architecture. It typically involves rebuilding or replatforming applications using scalable frameworks like Next.js and Sanity.
A well-planned legacy system migration strategy ensures no data loss, improved performance, and a foundation for innovation.Why must legacy software be changed?
Outdated software introduces security risks, and prevents integration with AI tools, APIs, and cloud systems.
Modernizing through legacy system migration services allows teams to innovate faster, reduce maintenance costs, and stay aligned with modern web performance and compliance standards.What is the problem with legacy systems?
Legacy systems create bottlenecks that block improvements and slow down performance. They are hard to maintain, expensive to host, and often incompatible with new technologies.
Modern legacy system migration is critical for keeping products fast, secure, and competitive.Is replacing a legacy system worth it?
Yes. Migrating to a modern stack delivers measurable gains in performance, security, and scalability while cutting maintenance costs.
Partnering with an experienced legacy system migration company ensures a smooth transition and faster ROI by aligning modernization efforts with business goals.How do you replace a legacy system?
Replacing a legacy system involves replatforming it to a modern framework. The process starts with a technical audit, defining a legacy system migration strategy, and gradually moving data, content, and functionality to the new stack. .
HAVE A WEBSITE TO MIGRATE?
LET’S TALK ABOUT IT!
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Tell us about your challenge and get help with your next moves in 24 hours.
Book a Meeting With Our CEO
If something seems unclear, it's always good to talk to an expert. And it's free!
Book a call with our CEO and get all the answers you need.
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Chris Lojniewski