Backend-first engineer with enterprise full-stack experience

Building performant products with Java, Spring Boot, Angular, and React.

I am a Software Engineer with around 2 years of experience at TransUnion, working on enterprise applications in the TruContact domain. My recent work has centered on API development, modernization, performance tuning, and secure full-stack delivery.

Open to product engineering opportunities

Currently working on enterprise modernization and reusable AI interface tooling.

Current focus

Enterprise modernization

Portrait of Sumant Kumar
Role Associate Software Developer
Domain TruContact at TransUnion

Impact snapshot

Enterprise impact across scale, quality, modernization, and delivery

Scale

8M+

Contributed to SOA modernization work supporting business flows handling close to 8 million transactions per month.

Performance

25%

Improved API response time by optimizing queries, backend services, and enterprise workflow execution paths.

Efficiency

15%

Reduced memory usage through Java 8 to Java 21 migration and runtime optimization efforts.

Quality

400+

Triaged and handled 400+ defects across delivery cycles while maintaining strong quality on owned modules and complex implementations.

Ownership

Full stack

Delivered across both backend and frontend, owning APIs, UI modules, fixes, and modernization workstreams end to end.

Leadership

Team delivery

Helped drive project completion alongside engineers with 7 to 8+ years of experience through execution ownership and hands-on problem solving.

About

Backend-focused, product-minded, and comfortable across the stack

My work is centered on building reliable software that improves system performance, simplifies workflows, and helps teams move from legacy applications to maintainable modern stacks. I spend most of my time on Java and Spring Boot, while also contributing to Angular and React-based frontend experiences when the product needs it.

At TransUnion, I have worked on enterprise applications in the TruContact space, including legacy AngularJS and Java systems as well as modernization initiatives using Spring Boot and Angular 19. I enjoy engineering problems where performance, security, and long-term maintainability all matter at the same time.

Java Spring Boot Angular React MySQL MongoDB

Experience

Enterprise engineering with measurable delivery impact

TransUnion

Associate Software Developer

June 2024 - Present

  • Working as a full-stack engineer on enterprise applications in the TruContact domain, handling both backend and frontend delivery across business-critical workflows.
  • Maintaining and enhancing legacy AngularJS plus Java applications while also contributing to modernization initiatives moving systems toward Spring Boot and Angular 19.
  • Contributed to SOA modernization efforts supporting workflows processing close to 8 million transactions per month.
  • Built and enhanced enterprise REST APIs and UI modules across multiple flows, improving API response time by around 25% and frontend responsiveness by around 20%.
  • Reduced memory usage by around 15% during migration and optimization work from Java 8 to Java 21.
  • Resolved 10+ critical vulnerabilities and helped triage 400+ defects, strengthening application quality, security, and release readiness.
  • Took strong ownership in driving project completion and complex implementations, collaborating effectively with team members having 7 to 8+ years of experience.

TransUnion

Applications Developer Intern

February 2024 - June 2024

  • Built a full-stack Notes and Todo application using React and Spring Boot with authentication and CRUD functionality.
  • Improved API latency by around 15% through more efficient request handling and backend optimizations.
  • Participated in API testing and integration to ensure smooth communication between frontend and backend services.

Projects

Selected work across enterprise systems and full-stack products

Enterprise

SSP - Self Service Portal

AngularJS, Enterprise UI maintenance

Legacy customer-facing portal with 8+ templates that allows users to correct and update order-related data. Worked on maintaining and improving the application while handling business-critical flows in a mature enterprise environment.

Modernization

Application Modernization Project

Spring Boot, Angular 19, REST APIs

Part of a larger modernization initiative to move legacy systems onto a scalable, maintainable architecture. Building backend APIs and frontend modules for modern enterprise workflows from May 2025 onward.

Full stack

Real Estate Platform

PHP, MySQL, Search and filtering

A full-stack platform for buyers, sellers, and agents with property listing, search, and filtering flows. Built with PHP and MySQL, with a clear path for future migration to a Spring Boot based backend if expanded further.

AI engineering

AI Chatbot UI

Angular, Spring Boot, LLM APIs

Reusable chatbot interface focused on real-time responses, scalable integration, and a product-ready developer experience. Designed to work as a plug-and-play building block instead of a single implementation.

Skills

Tools and technologies I use to ship production-ready software

Backend

Java, Spring Boot, REST APIs, Microservices

Java Java
Spring Boot Spring Boot
REST APIs REST APIs
Microservices Microservices

Frontend

Angular, React, JavaScript

Angular Angular
React React
JavaScript JavaScript

Database

MySQL, MongoDB

MySQL MySQL
MongoDB MongoDB

Tools

Git, Maven, Docker (basic), Postman

Git Git
Maven Maven
Docker Docker
Postman Postman

Concepts

System Design (learning), API Design, Performance Optimization

System Design
API Design
Performance

Cloud

Learning AWS

AWS AWS

What I'm currently working on

Modern enterprise systems with stronger performance and better developer experience

Modernizing legacy enterprise applications toward Spring Boot and Angular 19.

Improving APIs, runtime efficiency, and secure coding practices in production systems.

Exploring reusable AI product components that can fit into real business workflows.

Contact

Let's connect for backend, full-stack, or modernization roles

I am looking for opportunities where I can contribute to engineering teams working on scalable products, modern backend systems, and high-impact user experiences.