Designed and implemented robust and scalable payment system architectures, ensuring high availability, reliability, and security. Led the integration of third-party payment gateways and processors into payment ecosystem, enabling seamless transaction processing and fund transfers. Developed custom payment solutions tailored to business requirements, including ACH transfers, wire transfers, and electronic payments. Implemented transaction monitoring and fraud detection mechanisms within payment systems, reducing fraudulent activities and enhancing security measures.Designing and coding Java 17 and J2EE modules, including Spring Boot, Spring Cloud, Spring MVC, Spring Rest, Hibernate, and JPA. Proficient in bug fixing, addressing functionality, performance, and design issues using JavaScript, JQuery, HTML5, CSS3, and Angular 13/14.Furthermore, actively contributed to the refactoring of Microservices Architecture using Spring Boot and Spring Cloud, implementing the factory pattern to facilitate integration with multiple systems. My Skills span across the full stack, enabling him to deliver scalable and efficient solutions while staying abreast of the latest technologies and methodologies in software development.Environment: Java 17/11, Azure Cloud, Spring Cloud, Spring Boot, Spring MVC, Spring Security, Hibernate, Netflix OSS (Eureka, Zuul, Hystrix), OAuth 2.0, Swagger, Restful Web Services, Apache Kafka, Docker, Jenkins, Maven, GIT, JavaScript, JQuery, HTML5, CSS3, Angular 13/14, NodeJS, Tomcat, Spring Tool Suite (STS), MongoDB, Splunk, JMeter, LoadRunner, Selenium, Junit, Log4j, Jira

Demonstrated proficiency in integrating payment gateways within Amazon's ecosystem, ensuring seamless transaction processing for customers and merchants. Implemented strategies to optimize payment processing workflows, improving transaction speed, reliability, and security within Amazon's payment systems. Implemented support for diverse payment methods, including credit/debit cards, digital wallets, bank transfers, and alternative payment options, to enhance customer convenience and global accessibility. Enhanced the scalability and performance of Amazon's payment systems to handle increasing transaction volumes and peak loads during high-traffic periods, ensuring uninterrupted service for customers worldwide.I have extensive experience in designing and developing asynchronous RESTful Microservices using Spring Boot, ensuring an impressive average response time of 50 milliseconds. Leveraging Docker Containers, I ensured seamless deployment across hybrid cloud environments, fostering collaboration and innovation. In the persistence layer, I utilized Spring JDBC to effectively manage high volume transactions.Transitioning from a monolithic architecture to microservices, I adopted the 12-factor app methodology, enhancing scalability and maintainability. Security was a paramount concern, which I addressed comprehensively using Spring Security. Environment: Java 11, Amazon Web Services (AWS), Spring Cloud, Spring Boot, Spring Security, Spring MVC, Hibernate, Apache Kafka, Docker, Maven, Jenkins, GitHub, Swagger, Restful Web Services, HTML5, CSS3, ReactJS, Bootstrap, Ajax, JavaScript, NodeJS, Tomcat, Oracle, JUnit, Jira

I have a strong background in Spring Framework applications, including Spring Core, Spring AOP, Spring MVC, Spring Batch, Spring Security, and Spring Boot, which I seamlessly integrated into existing system architectures to enhance functionality. Leveraging Spring Boot at the backend simplified application development, while Spring Batch efficiently managed multiple requests across Microservices via Message Queue services.In addition, I spearheaded the migration of applications from On-premises environments to AWS Cloud Services, leveraging EC2 instances (RedHat), RDS for Oracle databases, S3 for storage, and Lambda for serverless computing, optimizing performance and scalability. Utilizing Hibernate as an ORM mapping tool, I adeptly worked with Hibernate Query Language (HQL) to streamline database operations and improve data access efficiency. My experience underscores a comprehensive understanding of Spring technologies and AWS services, enabling the seamless integration and optimization of enterprise-level applications for enhanced performance and scalability.Environment: Java 8/11, Azure Cloud, Spring Boot, Spring MVC, Spring Batch, Spring Security, Spring DAO, Hibernate, HTML5 CSS3, JavaScript, Angular 7/5, NodeJS, Ajax, JQuery, JSON, XML, JWT, Swagger, Restful Web Services, Tomcat, ActiveMQ, Log4j, Junit, Jira, Agile

I have extensive experience in developing code using various Design Patterns such as DAO, Factory Pattern, Singleton, Value Objects, Decorator, State, and Strategy, ensuring robust and maintainable software solutions. Leveraging the Spring framework, I implemented application architectures based on the Model-View-Controller (MVC) design pattern, separating concerns effectively and promoting modular development practices.In pursuit of Test-Driven Development (TDD), I designed a comprehensive framework that leveraged Dependency Injection through the Unity framework, facilitating the creation of a generic repository to streamline testing processes. Furthermore, I contributed to User Interface design by coding in HTML5, ReactJS, and Bootstrap, crafting responsive and visually appealing Single Page Applications (SPAs).Within ReactJS, I utilized components, Forms, Events, Keys, Router, Animations, and Flux concepts, enhancing user interactions and ensuring smooth navigation within the application. My proficiency across these technologies underscores a holistic approach to software development, combining design patterns, architectural principles, and front-end technologies to deliver robust, user-centric solutions.

Throughout the Software Development Life Cycle (SDLC), I actively participated in diverse phases including requirements gathering, modeling, analysis, design, development, and testing, ensuring comprehensive engagement and delivery of high-quality software solutions. Leveraging Core Java, I developed a range of helper classes essential for multi-threaded programming and utilized Collection classes to optimize data handling and manipulation efficiently.Implementing the Model-View-Controller (MVC) architecture, I played a pivotal role in developing Form classes and Action Classes for the entire application, leveraging the Spring Framework to ensure modular, scalable, and maintainable codebase. Additionally, I configured Hibernate's second-level cache employing EH cache, effectively mitigating the number of hits to configuration table data, thereby enhancing application performance and responsiveness. My involvement across these phases and technologies reflects a commitment to delivering robust, efficient, and scalable software solutions tailored to meet diverse business requirements.