Diwakar Reddy Karna

Java Full Stack Developer @ Tata Consultancy Services

About

Java Full-Stack Developer with 5+ years of experience designing and building scalable microservices and cloud-native web applications using Java (8–17), Spring Boot, React, and Angular. I specialize in RESTful APIs, event-driven architectures (Apache Kafka), and secure systems using OAuth2 & JWT. I have strong hands-on experience with AWS and Azure, leveraging services like Lambda, EC2, S3, API Gateway, DynamoDB, EKS, and CloudWatch to deliver highly available, performant systems. I’ve improved deployment frequency by 40% through CI/CD automation with Jenkins, Docker, Kubernetes, and Terraform, and consistently deliver high-quality, maintainable code in Agile teams. 💼 Current focus: Java 17, Spring Boot microservices, AWS cloud, Kafka streaming, React front-ends/ Angular 📍 Location: Irving, TX | Open to Hybrid/Onsite/Remote roles

Country

United States

City

Irving

Industry

Computer Software

Skill

AWS CloudFormation, JScript, PostgreSQL, Swagger API, Support Workers, Reducing Operating Costs, Reliability, Server Configuration, Typing, Angular Material, Program Deployment, DevOps, Manual Testing, Oracle Database, AWS Lambda, Elastic Stack (ELK), Hibernate, OAuth, Analytics, Prescription

Experience

Java Full Stack Developer

Tata Consultancy Services

2026-4 - Present · 6 mos

Irving, TX

Working as a Java Full Stack Developer at Tata Consultancy Services, currently supporting Citigroup. Focused on backend development using Java, Spring Boot, and REST APIs, building scalable microservices and enterprise applications.

Java Full-Stack Developer

United Airlines

2024-6 - 2026-4 · 1 yr 11 mos

United States

Built Spring Boot microservices & REST APIs for flight scheduling and fare search, supporting 50K+ peak-hour bookings with sub-50ms latency. Improved reliability by 45% by adding validation and fault handling in Apache Kafka event streams. Secured cloud-native services using Spring Security (OAuth2, JWT, RBAC) and migrated legacy WebSphere apps to Dockerized microservices. Developed React dashboards and AWS Lambda APIs (API Gateway, DynamoDB, Cognito), reducing operational costs by 20%.

Java Full-Stack Developer

Barclays

2021-6 - 2023-7 · 2 yrs 2 mos

United States

Designed a Spring Boot KYC micro-platform, integrating core banking systems with REST APIs and OAuth2/JWT. Optimized Oracle + Hibernate queries, cutting latency by 35% and improving transaction throughput. Integrated Kafka-based fraud alerts and built Angular analytics dashboards for risk teams. Automated CI/CD using Docker, Jenkins, and SonarQube, achieving 90%+ test coverage and faster releases.

Software Engineer

Kaiser Permanente

2019-6 - 2021-5 · 2 yrs

United States

Delivered healthcare modules using Java 8, Spring MVC, JSP, improving clinician productivity by 30%. Built HIPAA-compliant REST APIs with encryption and access controls, maintaining 99.99% data security uptime. Automated patient notifications with Spring Scheduler, reducing no-shows by 15%. Migrated legacy services to Spring Boot and introduced ELK logging for better monitoring.