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Sekhar - Full Stack Java Developer

[email protected]

Location: Plano, Texas, USA

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Sr. Full Stack Java Developer Sekhar Sai 347 791-1454 | [email protected] PROFESSIONAL SUMMARY Full Stack Java Developer with 8+ years of cross-industry experience across payments, healthcare, and supply chain domains. Currently at Mastercard, building EMVCo 3DS transaction pipelines, AI-powered payment agents, and high-throughput microservices on Java 17+, Spring Boot, Spring Framework and Spring Web Flux. Proficient in event-driven architecture, OAuth2/JWT security, Kubernetes/PCF deployments, and full-stack development with Angular and React.js consistently delivering PCI-DSS-compliant, high-performance systems at enterprise scale. TECHNICAL SKILLS Languages Java 17+, TypeScript, JavaScript, SQL, PL/SQL, Python Frameworks Spring Boot, Spring Web Flux, Spring MVC, Spring Data JPA / Hibernate, Angular, React.js, Node.js, Axon Framework, Project Reactor AI & LLM LLM API Integration, AI Agent Development, MCP (Model Context Protocol) Server Implementation, Prompt Engineering Build Tools ANT, Maven, Gradle, Build Forge, CMAKE, MS Build CI/CD Tools Jenkins, Bamboo, Build Master, CI/CD Payments & Security 3-D Secure (EMVCo 3DS), ISO 8583, OAuth2 / JWT, PCI-DSS, Challenge Flow Orchestration, Directory Server (DS) & ACS Integration Version Control Tools GIT, GITHUB, Bitbucket, SVN Containerization Docker, Docker Swarm, Kubernetes Monitoring Tools Splunk, Cloud Watch, ELK, Grafana, Prometheus Messaging Apache Kafka, RabbitMQ, Axon Event Bus, Event-Driven Architecture. Testing Junit 5, Mockito, Selenium, TDD, Integration test, SonarQube, Checkmarks Database DynamoDB, MongoDB, Oracle, SQL Server, MySQL, PostgreSQL, RDBMS Web Servers Apache Tomcat, Nginx, Apache Http Client: Mastercard, O Fallon, MO November 2024 Present Role: Sr. Full Stack Java Developer Responsibilities: Design, develop, and maintain production-grade RESTful microservices using Java 17+ and Spring Boot, adhering to SOLID principles and clean architecture to power Mastercard's global payment processing platform handling millions of transactions daily. Implement secure 3DS challenge flow orchestration, directory server (DS) callouts, and access control server (ACS) integrations, ensuring full compliance with EMVCo 3-D Secure standards across card-not-present transaction flows. Design and maintain authorization request/response processing pipelines ISO 8583 message parsing, transaction routing, and real-time approval/decline decisions at scale. Develop AI-powered agents leveraging LLM APIs integrated with Spring Boot backends to automate transaction anomaly detection, dispute resolution workflows, and intelligent payment routing decisions. Integrate AI coding assistants GitHub Copilot into daily development workflow for unit test generation, code reviews, refactoring suggestions, and documentation reducing time spent on non-feature work by 35%. Utilize Claude Code for context-aware code completion and multi-file refactoring across complex payment domain codebases cutting average feature development time from 3 days to 1.5 days. Implement custom MCP (Model Context Protocol) servers that expose internal microservice capabilities as tools consumable by AI agents, enabling intelligent orchestration across Mastercard's payment ecosystem. Build and maintain RESTful and reactive APIs secured with OAuth2/JWT authentication and authorization, safeguarding cardholder and transaction data in compliance with PCI-DSS standards. Implement reactive programming patterns via Spring WebFlux and Project Reactor for non-blocking, asynchronous service communication, optimizing throughput for high-volume card authorization and settlement pipelines. Develop responsive Angular dashboards (TypeScript, HTML5, CSS, Node.js) enabling real-time monitoring of transaction volumes, authorization rates, and fraud signals. Implement event consumers and subscribers using Axon Framework to process domain events (payment authorized, transaction reversed, chargeback initiated), ensuring reliable asynchronous communication across distributed microservices. Design event-sourced aggregates for payment transactions and dispute management, maintaining full audit trails for compliance and fraud investigation. Deploy and manage microservices on Pivotal Cloud Foundry (PCF) and Kubernetes with auto-scaling, blue-green deployments, and zero-downtime releases maintaining 99.99% uptime SLAs for critical payment services. Develop database layers using Spring Data JPA/Hibernate with optimized query strategies and connection pooling for high-frequency transaction ledger read/write operations. Optimize performance through Redis caching for BIN table lookups, exchange rate data, and merchant config, reducing database load and improving authorization response times. Implement structured logging (SLF4J/MDC) and distributed tracing using correlation IDs, enabling end-to-end visibility of transaction journeys from initiation to settlement. Maintain CI/CD pipelines using Jenkins and GitHub Actions for automated build, test, and deployment workflows enabling rapid delivery of payment service enhancements. Write comprehensive unit and integration tests using JUnit 5 and Mockito across transaction processing, fraud rule engines, and API gateway layers; enforce coding standards with Lombok and SonarQube. Orchestrate containerized deployments using Docker and manage workloads on Kubernetes, ensuring scalability and resilience under peak transaction load. Environment: Java 17+, Spring Boot, Spring WebFlux, Axon Framework, Angular, TypeScript, OAuth2/JWT, 3-D Secure (EMVCo 3DS), ISO 8583, Docker, Kubernetes, PCF, Redis, Kafka, JUnit 5, SonarQube, Jenkins, GitHub Actions, PostgreSQL, AWS Client: Blue Cross and Blue Shield of Kansas City, Kansas City, MO December 2022 October 2024 Role: Full Stack Java Developer Responsibilities: Delivered microservices and REST APIs in Spring Boot, enabling modular releases and reducing defect leakage by 20%. Built React.js front-end with reusable components, reducing UI development cycle by 30% and improving cross-application consistency. Implemented Kafka & RabbitMQ pipelines for real-time data processing, reliably handling 100K+ daily transactions. Integrated AWS Lambda & API Gateway, cutting server infrastructure costs by 25% through serverless computing. Managed microservices using Docker, Kubernetes, and OpenShift to streamline CI/CD pipelines across multiple environments. Maintained and upgraded UI applications using React.js, TypeScript, JavaScript, CSS3, jQuery, AJAX, and HTML5 with React Router for multi-page navigation. Applied DAO, Factory, and MVC design patterns, improving maintainability and reducing code complexity by 15%. Automated builds and deployments using Maven, Jenkins, and Adobe Cloud Manager, reducing deployment errors by 40%. Designed RESTful APIs via AWS API Gateway and Lambda to process Excel files and ingest data into PostgreSQL via S3-triggered functions. Maintained data access layer using Hibernate ORM; authored stored procedures and functions in PL/SQL for Oracle database operations. Developed functional test automation using Selenium and JUnit; provided on-call support for production SQL and NoSQL databases. Environment: Java, Spring Boot, React.js, TypeScript, JavaScript, Kafka, RabbitMQ, AWS Lambda, API Gateway, S3, Docker, Kubernetes, OpenShift, Hibernate, Oracle, PostgreSQL, PL/SQL, Selenium, JUnit, Maven, Jenkins, AEM Client: US Foods, India June 2020 July 2022 Role: Senior Java Developer Responsibilities: Developed Spring MVC/AngularJS applications with REST/JAX-RS services, increasing system throughput by 25%. Responsible for developing UI pages using HTML5, CSS3, AngularJS, JavaScript, jQuery, AJAX and JSON Introduced Selenium TDD automation framework, reducing manual testing effort by 50%. Diagnosed and resolved performance bottlenecks across application layers, improving average response time by 30%. Implemented API monitoring and logging using Apigee, CloudWatch, and Log4j to track and troubleshoot production performance issues. Performed SQL query optimization using indexing, partitioning, and execution plan analysis, cutting database response times by 25%. Built serverless microservices integrating AWS Lambda, S3, CloudWatch, and API Gateway; worked extensively with EC2, ELB, and Security Groups. Established CI pipelines using Jenkins with Maven plugins for multi-environment automated deployments. Used Jira for bug tracking, sprint planning, and Agile team collaboration. Environment: Java, Spring MVC, AngularJS, JAX-RS, Jenkins, Maven, Selenium, AWS (Lambda, S3, EC2, CloudWatch, API Gateway), Apigee, Log4j, SQL, Jira Client: HDFC Bank, India September 2017 April 2020 Role: Java Web Developer Responsibilities: Built loan servicing and financial systems using Struts, JSP, and Java, improving transaction accuracy by 20% across payment and servicing workflows. Worked in using ReactJS components, Forms, Events, Keys, Router, Animations and Flux concepts. Developed reusable GUI frameworks, reducing duplicate code by 35% and accelerating feature delivery. Authored test plans and executed TDD across unit, regression, and integration testing, cutting UAT cycle time by 15%. Monitored AWS resources using CloudWatch, configuring alarms for EBS, EC2, RDS, and S3 metrics. Automated data validation and cleanup using SQL scripts, improving data quality and reducing errors by 35%. Developed error handling, pagination, and API versioning strategies ensuring scalability and backward compatibility. Gained deep fintech domain expertise in loan origination, payment processing, and account servicing within a major banking environment. Environment: Java, Struts, JSP, SQL, PL/SQL, AWS CloudWatch, TDD, JUnit, HTML, CSS EDUCATION Bachelor of Technology Computer Science & Engineering V R Siddhartha Engineering College, India Keywords: continuous integration continuous deployment artificial intelligence user interface javascript sthree rlang microsoft mississippi procedural language Missouri