Senior React + TypeScript UI Engineer: Legacy Modernization

Valiant Technologies LLC; Richardson (TX); On-site; USD 120,000 - 160,000; Full time

Job summary

Valiant Technologies LLC is seeking an experienced UI Developer to modernize a legacy VB.NET application by building responsive, user-friendly web interfaces using ReactJS and TypeScript, connected to Java Spring Boot back-end services.

You will migrate legacy screens, implement REST API integrations, and collaborate across teams to ensure feature parity and a superior user experience using Material UI or Bootstrap. Strong problem-solving and communication skills are essential.

Qualifications

• 6+ years of hands-on ReactJS development experience.
• Experience integrating frontend with REST APIs.
• Strong knowledge of Redux and Context API for state management.
• Experience with Material UI, Bootstrap, or similar UI frameworks.
• Proficiency in Git and Agile methodologies.
• Experience with Java Spring Boot backend integration.
• Hands-on experience migrating legacy applications to modern web platforms is preferred.
• Strong problem-solving, debugging, and communication skills.

Responsibilities

• Migrate legacy VB.NET UI screens and workflows into modern ReactJS applications.
• Integrate frontend applications with Java Spring Boot REST APIs.
• Collaborate with business analysts, backend developers, and technical teams to ensure feature parity and improved user experience.
• Develop responsive interfaces using UI frameworks such as Material UI and Bootstrap.
• Perform unit testing, debugging, code reviews, and performance optimization.
• Use Git for version control and participate in Agile development processes.
• Support application modernization and migration from legacy platforms to modern web technologies.

Skills

ReactJS

REST APIs

Redux

Context API

Material UI

Bootstrap

Git

Agile

Spring Boot

VB.NET migration

Debugging

Tools

Git

REST API testing

Job description

Valiant Technologies LLC is seeking an experienced UI Developer to modernize a legacy VB.NET application by building responsive, user-friendly web interfaces using ReactJS and TypeScript, connected to Java Spring Boot back-end services.

You will migrate legacy screens, implement REST API integrations, and collaborate across teams to ensure feature parity and a superior user experience using Material UI or Bootstrap. Strong problem-solving and communication skills are essential.