Designed and implemented UI, according to Web Content Accessibility Guidelines.

Reengineered existing React components for reusability.

Implemented data validation mechanisms.

Implemented Role-Based Access Control, improved security and access control.

Implemented a real-time chat feature based on Socket protocol, enriched user experience.

Implemented caching mechanism.

Implemented sorting and filtering functionality, improved data organization and retrieval.

Implemented REST API service, enhanced data access and interactions (Node.js, Express.js).

Optimized application logic, and reduced client-side workload and HTTP requests.

Covered over 60% of the system's functionality with unit tests (Jest).

Optimized data storage and retrieval (PostgreSQL).

Developed internal JWT-based login service.

Performed code reviews.

Rebuilt class components to functional and cleaned up 1/4 of legacy code using best practices (React.js).

Maintained 95% regression test scenario coverage through test case creation, updating, and maintenance

Attained 100% requirement coverage with tests