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Progressive Web Application Modernization

We successfully modernized a 6-year-old web application by implementing a micro-frontend architecture, enabling gradual migration from legacy Vue.js and Meteor to modern React without disrupting ongoing development or existing functionality.

Client

Polish Company

Services

Refactoring

Challenge

The client faced several technical and business constraints:

  • Legacy application built with outdated versions of Vue.js and Meteor

  • Slow development cycles (30-second reload times in development)

  • Difficulty finding developers experienced with older frameworks

  • Business requirement to maintain continuous feature development

  • Unable to afford complete system rewrite (time and cost constraints)

  • Need to preserve stable, tested core functionality

  • Complex authentication system tied to legacy codebase

Solution

We implemented a sophisticated modernization strategy using micro-frontends:


Architecture Modernization

  • Implementation of micro-frontend architecture

  • Integration of modern React application within legacy system

  • Migration to tRPC for backend services

  • Monorepo setup for improved code management

  • Preservation of existing authentication system

  • Parallel operation of old and new systems


Technical Stack Updates

  • Modern React implementation

  • Node.js backend services

  • tRPC for type-safe API communication

  • Latest development tools and libraries

  • Optimized build system

  • Enhanced development environment


Development Infrastructure

  • Monorepo architecture for unified code management

  • Independent development environments for new features

  • Faster development reload times

  • Improved debugging capabilities

  • Enhanced developer tooling

  • Streamlined deployment process


Integration Strategy

  • Seamless embedding of new applications

  • Preserved legacy authentication

  • Gradual feature migration

  • Zero downtime implementation

  • Minimal disruption to users

  • Maintained business continuity

Result

The implementation delivered significant improvements across multiple areas:


Development Efficiency

  • Reduced development reload time from 30s to <2s

  • Improved developer productivity

  • Easier recruitment of developers

  • Faster feature development

  • Enhanced code maintainability

  • Better development experience


Technical Benefits

  • Modern, maintainable codebase

  • Improved application performance

  • Better type safety with tRPC

  • Enhanced debugging capabilities

  • Reduced technical debt

  • Future-proof architecture


Business Impact

  • Continuous feature development maintained

  • No disruption to core business operations

  • Reduced development costs

  • Improved time-to-market for new features

  • Better resource allocation

  • Enhanced competitive position


Operational Improvements

  • Simplified deployment process

  • Better code organization

  • Reduced maintenance overhead

  • Improved system reliability

  • Enhanced monitoring capabilities

  • Better error handling


Team Benefits

  • Easier onboarding of new developers

  • Improved team satisfaction

  • Better collaboration capabilities

  • Enhanced code review process

  • Reduced learning curve

  • Modern development experience


The modernization approach has successfully transformed a legacy application into a modern, maintainable system while preserving business continuity and existing functionality. The micro-frontend architecture provides a sustainable path forward for continued development and growth.

Contact

Let’s Build something

Together, let's work on your problem and find the right solution.

Contact

Let’s Build something

Together, let's work on your problem and find the right solution.

Contact

Let’s Build something

Together, let's work on your problem and find the right solution.