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• Performed J2EE application deployment using JBoss application server on Windows and Linux.• Architected and implemented a robust authentication and authorization system in Golang, incorporating JWT and OAuth2 protocols, ensuring secure access control across multiple services and applications.• Developed microservices and RESTful APIs using Golang for a high-traffic web application.• Implemented microservices with Spring Boot and Spring REST, integrating Swagger for dynamic API documentation. Developed user authentication and authorization using Spring Security OAuth2.0 and JSON Web Token. Utilized Spring Boot to modularize code and implement REST APIs with Spring Rest, integrating Swagger API for documentation.• Implemented Account Management Microservice with Spring Data, Spring JPA, and Spring REST in Spring Boot application. Managed day-to-day operational tasks for Identity & Access Management, with expertise in WSO2.• Configured transactional aspects with Spring's @Transactional annotation, specifying transaction attributes such as isolation levels, timeout settings, and rollback rules tailored to specific business requirements.• Utilized SDKs to consume and interact with RESTful APIs, SOAP services, and webhooks in Java applications, facilitating data exchange and integration with external systems.• Implemented continuous integration and deployment pipelines using Jenkins and Bash scripting, enabling streamlined build, test, and deployment processes for complex software projects.• Applied advanced optimization techniques to SQL queries in PostgreSQL, enhancing database performance and response times. Developed stored procedures and triggers using PL/SQL. Enhanced and optimized stored procedures in PostgreSQL, contributing to improved data processing efficiency and reduced execution times.

• Implemented OOPs (Object Oriented Programming) concepts and collections framework. Developed Java APIs for new requirements, utilizing Data Structures, Algorithms, Core Java, and OOPs concepts effectively.• Developed applications using the latest Java/J2EE technologies, including Java 11 features. Implemented middle-tier applications with J2EE, utilizing EJB, Java Beans, and Web Services standards (SOAP, WSDL, UDDI).• Implemented custom security aspects using Spring AOP to enforce cross-cutting security concerns such as authentication, authorization, and logging across application layers.• Designed and developed APIs in Apigee for exposing Walmart's services and data assets to internal and external developers, partners, and applications.• Led end-to-end development of robust and scalable e-commerce platform using Java 11, Spring Boot, Spring JPA, and Hibernate. Used Elasticsearch for efficient and fast search functionality for the e-commerce business.• Employed caching strategies (e.g., Redis or Ehcache) to cache frequently accessed data and reduce database load, improving application responsiveness.• Developed applications using Drools BRMS, integrating with Magento e-commerce API. Designed and implemented RESTful web services using Jakarta EE's JAX-RS specification. Developed web service for web store components using RESTful API with Java & Spring.• Developed application-specific thread-safe XML APIs, XML Document Builder, and parser validators using Java DOM Parser. Created RESTful web services to simplify client access with standard HTTP URLs.• Developed lightweight business components with Spring framework, including Spring JDBC, Spring JPA, and Spring IOC. Implemented Microservices & APIs using Spring Cloud, Spring Security, Spring Boot, Spring Integration, and Struts. Containerized all the ticketing related applications – Spring Boot and Node.JS applications using Docker.

• Demonstrated expertise in diverse payment processing realms, including Wires, ACH, Zelle, TCH RTP, and Bill Payments, contributing to a comprehensive and adaptive financial system.• Developed and maintained high-performance, real-time market data applications using Java, leveraging industry-standard protocols such as FIX (Financial Information Exchange) and proprietary exchange APIs.• Designed and developed objects with Object-Oriented Design in Java 8. Managed versions with SVN and tracked defects with Jira. Automated most of the daily task using Python scripting.• Worked on XML Technologies like XML Parsers and JAXB for binding data to Java 8 objects.• Developed the Spring AOP Programming to configure logging for the application.• Extensively used Maven to build the application and deploy on Embedded Tomcat Server.• Worked extensively on Web Services (SOAP & REST), XML, JMS, and Spring Controller. • Implemented GraphQL caching strategies to optimize data fetching and minimize network latency utilizing Apollo Client for caching solutions.• Developed custom Gradle plugins and Microservices using Spring Boot, Spring JPA, REST, and JSON, with MongoDB as the primary NoSQL database, demonstrating MERN stack expertise.• Designed and Developed Stored Procedures, Triggers in Oracle to cater the needs for the entire application. • Developed complex SQL queries for extracting data from the database

• Designed and developed web applications with Core Java, J2EE, Struts, JSP, Hibernate, Java Beans, XML, XSLT, XSL, and ANT. Implemented multithreading, collections, and other J2EE technologies.• Utilized Java 1.8 and Spring Framework 4, including Spring Boot, MVC, Core, AOP, Security, and AspectJ.• Employed Advanced Java 1.8 features such as Lambda for functionality processing and Stream API for pipeline processing and element elimination based on criteria.• Designed API endpoints following RESTful principles to ensure scalability, maintainability, and flexibility.• Implemented SOAP message payloads using XML to define service operations, data structures, and message formats, adhering to WSDL specifications for service contracts.• Implemented event-driven architecture using messaging brokers like Kafka or RabbitMQ for asynchronous communication between microservices, enabling loose coupling and scalability.• Used Struts framework for the MVC implementation and Hibernate as ORM tool for database communication.• Worked extensively with JSPs and Servlets to accommodate all presentation customizations on the front end.• Used Spring framework as a business logic tier to perform IOC, AOP, and integration with Spring MVC to define Controller, action mappings, services, DAO’s, and DAO’s implementation to perform CRUD operations interactive with persisting objects. • Developed DAOs using Hibernate persistence API for the database operations to interact with Oracle database.• Written and executed various SQL Queries and PL\SQL programs to retrieve the data from the database Oracle.• Designed and implemented cloud-based solutions on Microsoft Azure, leveraging a wide range of Azure services.• Conducted Azure resource provisioning and management via Azure Portal, Azure CLI, and Azure Resource Manager (ARM) templates. Implemented Log4j and JUnit for unit testing to monitor application functionality.

• Interacted with the database team using JDBC. Maintained Spring Framework's IoC container configuration. Developed an internal browser-based text editor with HTML, Ajax, CSS, JavaScript, and jQuery.• Designed and implemented REST APIs to establish connections with various vendor websites.• Designed and implemented RESTful APIs for microservices communication, adhering to REST principles and industry best practices for resource naming, versioning, and error handling.• Installed, configured, and hosted Oracle, Tomcat app servers, and Cassandra DB servers on physical servers (Linux, Windows) and Amazon AWS virtual servers. Built and deployed Microservice applications using AWS Stack, including S3, EC2, Aurora, Kinesis, SNS, and SQS.• Performed data storage on AWS using AWS RDS feature and used Oracle 11G as a database for transactions.• Participated in development of a well responsive single page application using AngularJS framework, JavaScript, and jQuery in conjunction with HTML5, CSS3 standards, with front-end UI team.• Created reusable components and services in JavaScript to consume REST API's using a Component-based architecture provided by AngularJS.• Used jQuery, AngularJS and Node.js to develop the rich user interface and to invoke RESTful Web Services to perform various operations.

• Developed the presentation tier using HTML, CSS, JSP, Servlets, JSTL, Ajax and Struts.• Used Struts-Validator framework for all front-end Validations for all the form entries.• Used Struts framework for the MVC implementation and Hibernate as ORM tool for database communication.• Worked extensively with JSP’s and Servlets to accommodate all presentation customizations on the front end.• Used different Design patterns like MVC pattern, DAO pattern, and singleton to achieve clean separation of layers.• Designed and developed the code using multithreading, Collections and other J2EE technologies.• Experience developing and delivering commercial enterprise software with focus on scalability, security, availability.• Developed the application in highly multi-threaded programming using Java, OOPs concepts and threads.• Involved in the development of the User Interfaces using HTML, JS, and CSS. • Developed business validation using spring.• Developed XML files using ONS.• Involved in documentation and defect fixing.• Developed SQL scripts, PL/SQL scripts.• Developed simple front end using JavaScript, HTML.