Java Full Stack Developer - Spring Boot & React Expert

Hari Karthik

Java Full Stack Developer

Coraopolis, PA **************@*****.*** LinkedIn

PROFESSIONAL SUMMARY

Java Developer with 3+ years of hands-on experience in system design, application development, testing, and operational stability across enterprise, e-commerce, and healthcare environments. Proficient in Java, Spring Boot, and React.js/Angular, with proven ability to develop, debug, and maintain code in large corporate environments using modern programming languages and database querying languages including SQL, PostgreSQL, and MongoDB. Experienced across the full Software Development Life Cycle, with strong exposure to Agile methodologies, CI/CD pipelines, application resiliency, and security best practices. Hands-on expertise in AWS (EC2, S3, RDS, Lambda) and emerging knowledge of cloud-native architectures, microservices, and event-driven systems. Delivered measurable outcomes including a 35% improvement in release efficiency, 30% gain in application performance, and a 25% increase in payment transaction success rates through disciplined engineering practices.

TECHNICAL SKILLS

Languages: Java (8/11/17), JavaScript (ES6+), TypeScript, SQL, HTML5, CSS3 Backend Technologies: Spring Boot, Spring MVC, Spring Security, Hibernate, JPA, Microservices, RESTful APIs, JWT Authentication

Frontend Technologies: React.js, Angular, Bootstrap, jQuery, AJAX, JSON Cloud — AWS: EC2, S3, RDS, Lambda; Microsoft Azure (Virtual Machines, App Services, Azure SQL, Blob Storage, Azure DevOps)

CI/CD & DevOps: Jenkins, GitHub Actions, Docker, Kubernetes, Maven, Gradle, Git, GitHub Databases: PostgreSQL, MySQL, Oracle, MongoDB

Messaging & Integration: Kafka, RabbitMQ

SDLC & Tools: Agile, Scrum, JIRA, Confluence, JUnit, Mockito, Selenium, Postman PROFESSIONAL EXPERIENCE

Java Full Stack Developer — Purevisitx Austin, TX May 2024 – Present

• Designed, developed, and maintained Java-based backend services and APIs using Spring Boot, Spring MVC, and Microservices architecture, supporting enterprise business workflows in a large corporate environment.

• Improved release efficiency by 35% through CI/CD pipeline automation using Azure DevOps, Jenkins, and GitHub, applying Agile methodologies and application resiliency best practices across the full Software Development Life Cycle.

• Developed and maintained responsive front-end components using Angular, React.js, HTML5, CSS3, JavaScript, and TypeScript, delivering user-friendly interfaces in a modern programming language stack.

• Deployed and managed cloud-native applications on AWS (EC2, S3, RDS, Lambda) and Microsoft Azure, demonstrating emerging knowledge of cloud architectures and scalable distributed systems.

• Enhanced application security by implementing Spring Security with role-based access control and JWT authentication, addressing security exposure across the SDLC.

• Improved application performance by 30% by developing, debugging, and optimizing database queries across Oracle, MySQL, and PostgreSQL, applying database querying language expertise to resolve production bottlenecks.

• Containerized applications using Docker and orchestrated deployments with Kubernetes; integrated Kafka and RabbitMQ for asynchronous, event-driven messaging supporting operational stability.

• Performed system design, unit testing, and integration testing using JUnit, Mockito, Selenium, and Postman, ensuring code quality and application stability throughout development and release cycles.

• Collaborated with cross-functional DevOps, QA, and product teams in Agile Scrum environments using JIRA and Confluence, maintaining demonstrable ability to deliver reliable code at scale. Java Full Stack Developer — eBay India Jan 2022 – Jul 2023

• Developed, debugged, and maintained full-stack e-commerce applications using Java (8/11), Spring Boot, Spring MVC, and Microservices in a large corporate environment, handling product catalog, order management, pricing, and payment systems.

• Increased payment transaction success rates by 25% by integrating third-party payment gateways and checkout services, demonstrating hands-on ability to code and resolve critical production issues.

• Designed and implemented RESTful APIs using modern programming language practices, supporting integration across microservices for order processing, inventory, and payment workflows.

• Deployed and managed microservices on AWS (EC2, S3, RDS, Lambda), applying cloud knowledge and Agile CI/CD disciplines to maintain application resiliency and availability.

• Built responsive user interfaces using React.js, JavaScript, HTML5, CSS3, and Bootstrap, covering both frontend and backend across the full Software Development Life Cycle.

• Optimized relational database schemas and queries using MySQL, Oracle, and PostgreSQL; implemented caching to improve response times and enhance operational stability.

• Implemented event-driven order processing workflows using Kafka and RabbitMQ; containerized services with Docker and orchestrated with Kubernetes for scalability.

• Conducted unit and integration testing using JUnit, Mockito, Selenium, and Postman; participated in Agile code reviews and contributed to team-wide quality and security best practices.

• Collaborated within Agile Scrum teams to deliver features on schedule, maintaining code in version-controlled repositories using Git and GitHub across the SDLC. Java Developer — Pulsearc Hyderabad, India Dec 2020 – Dec 2021

• Developed healthcare backend applications using Java (8), Spring, Spring MVC, and Hibernate, demonstrating hands- on experience in application development across patient records, billing, and appointment management systems.

• Built and maintained RESTful APIs to support clinical and operational data workflows, applying database querying languages including MySQL and Oracle to maintain system stability.

• Implemented Spring Security with role-based access control for user authentication and authorization, reinforcing application security best practices across the Software Development Life Cycle.

• Developed and enhanced frontend UI components using Angular, HTML5, CSS3, JavaScript, and AJAX, contributing to full-stack delivery in a modern programming environment.

• Assisted in migrating legacy healthcare applications to Spring Boot and Microservices architecture, gaining emerging knowledge of cloud-native design patterns and distributed systems.

• Deployed applications on Microsoft Azure using Virtual Machines, App Services, and Blob Storage; applied CI/CD practices using Azure DevOps, Jenkins, Git, and GitHub.

• Designed and maintained relational database schemas using MySQL and Oracle; wrote optimized SQL queries to support reporting and transactional operational stability.

• Wrote unit and integration tests using JUnit, Mockito, Selenium, and Postman; collaborated within Agile Scrum teams and contributed to code reviews and documentation.

• Participated in the full SDLC including requirements analysis, development, testing, deployment, and maintenance, building well-rounded experience across all engineering phases. EDUCATION

Master of Science — Information Systems and Management 2024 Robert Morris University

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