Build and maintain robust, scalable microservices supporting diverse payment methods; developed enterprise-grade web applications on the Java EE platform; integrated front-end with backend services; implemented SPAs using Angular/React; optimized data access with JPA/Hibernate across Oracle, MySQL, and PostgreSQL; tuned JVM/thread pools/caching; secured APIs with JWT; implemented OAuth2 and OpenID Connect for SSO; deployed SPAs in cloud environments; performed on-call incident response and RCA for payment-related issues.

Java Developer at Visa Inc.

October 1, 2022 - January 1, 2025

Developed Spring-based applications with MVC architecture; built UI using JSP/HTML5/Angular; implemented authentication/authorization with JAAS, LDAP, OAuth 2.0, JWT and Spring Security; designed REST and SOAP web services; database access via JDBC/JPA/Hibernate; implemented RBAC/ABAC; integrated with JMS; contributed to CI/CD pipelines and high-availability deployments.

Java Developer at Magic Leap Inc.

January 1, 2021 - October 1, 2022

Designed and implemented 14+ microservices using Spring Boot 3, WebFlux, and Kafka for a real-time logistics SaaS; built responsive SPAs with Angular/TypeScript; migrated critical monolith modules to reactive microservices, boosting throughput; implemented SSO with Keycloak, JWT/OAuth2; created CI/CD pipelines to AWS EKS with Helm; Terraform-based infrastructure; security audits and client feedback integration.

Java Developer at Austin ISD (State of Texas)

June 1, 2020 - December 1, 2020

Developed core modules for a digital payments platform handling 20K+ concurrent users; integrated gRPC services to reduce inter-service latency; anti-fraud logic using Drools and Kafka; secured APIs with JWT/OAuth2 and Spring Security; designed server-side caching with EHCache; Maven/Jenkins CI/CD; front-end integration with JSP/Angular; implemented RBAC/ABAC.

Java Developer at Visa Inc.

March 1, 2019 - May 1, 2020

Contributed to backend APIs powering a global shopping platform; implemented REST/SOAP services using JAX-WS/JAX-RS; secured endpoints with JWT/OAuth2 and Spring Security; worked with Oracle/MySQL; JBOSS/Tomcat WAS deployments; CI/CD with Maven/Gradle and Jenkins; performance optimization and security reviews; cross-functional SOA collaboration.

Jr. JAVA Developer at HP/DXC Technologies (CMPIS State of California)

September 1, 2015 - February 1, 2019

Developed user interfaces using JSP/HTML/JavaScript; refactored legacy code; created REST APIs with Spring/Hibernate/JPA; Oracle/MySQL/SQL Server databases; WebSphere WAS 8; EJB/JMS messaging; automated tests with JUnit/Selenium; front-end with AngularJS/Struts/JSF; CI/CD with Jenkins; data migrations and performance tuning; batch processing with Spring Batch.