Enterprise Software
Legacy Modernization

Modernizing Legacy ExtJS Application with API Migration and UI Revamp

An enterprise resource and portfolio management platform built on a legacy ExtJS frontend required a comprehensive overhaul to meet the demands of modern business operations. The existing system handled complex workflows and large datasets but was falling behind in usability, speed, and maintainability.
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Challenge
Solution
The Outcome

The Challenge

The legacy system required a full modernization effort while keeping active business-critical workflows intact throughout the transition.

Rigid Legacy Architecture

The tightly coupled ExtJS frontend made it difficult to introduce new features, modify workflows, or scale the application. Performance degraded significantly in data-heavy components like grids and forms, creating friction for daily users.

Outdated API Integrations and Migration Risk

Backend APIs had evolved beyond what the frontend supported, creating data contract mismatches. Updating these connections without disrupting active workflows introduced significant risk to business continuity.

The Solution

We executed a structured modernization plan that addressed both frontend usability and backend alignment without interrupting active operations.

ExtJS UI Component Revamp

Refactored data grids, forms, and key UI components to improve responsiveness and reduce interaction friction.

API Migration and Alignment

Migrated legacy integrations to updated endpoints, ensuring compatibility with current backend data contracts and structures.

Data Rendering Optimization

Improved how large datasets were processed and rendered to eliminate lag and improve overall application speed.

Backward-Compatible Transition Management

Handled the migration in stages to protect existing workflows while introducing new API structures incrementally.

Error Handling and Cross-Team Collaboration

Strengthened frontend resilience against API failures and worked directly with backend teams to maintain consistent data exchange throughout.

The Outcome

The platform now operates with a modernized frontend, reliable API connections, and an architecture built for ongoing development. Users experience less friction in complex workflows, and the system is positioned for sustainable growth.

40% reduction in UI interaction lag after optimizing data-heavy grid and form components for faster rendering and responsiveness.

100% uninterrupted API migration completed without production incidents, preserving business continuity across all active workflows.

60% improvement in long-term maintainability through refactored components and updated integrations that simplify future enhancements and reduce technical debt.

We have been working with Entrans for the last two years and they have played a key role in building our solution. Their expertise and professionalism were evident throughout the development cycle, and we were very pleased with the final product. They have shown enormous skill and vast domain knowledge and their IT expertise is reliable and trustworthy. We would recommend Entrans for anyone looking for quality IT services, delivered in a professional manner
Nikolay Prokopiev
Chief Executive Officer
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