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I am a Java Full Stack Developer with 11+ years of experience delivering scalable web applications and enterprise-grade solutions. I design and implement distributed systems, microservices, and API ecosystems using Java/J2EE, Spring, Kafka, and cloud-native technologies. I thrive in fast-paced Agile environments, mentor engineers, and drive architecture decisions that improve reliability, security, and performance. My focus areas include domain-driven design, observability, DevOps, and secure, scalable software delivery.…I am a Java Full Stack Developer with 11+ years of experience delivering scalable web applications and enterprise-grade solutions. I design and implement distributed systems, microservices, and API ecosystems using Java/J2EE, Spring, Kafka, and cloud-native technologies. I thrive in fast-paced Agile environments, mentor engineers, and drive architecture decisions that improve reliability, security, and performance. My focus areas include domain-driven design, observability, DevOps, and secure, scalable software delivery.

Prem Niranjan

Full Stack Developer, Web Developer, Front-End Developer, +3

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I am a Java Full Stack Developer with 11+ years of experience delivering scalable web applications and enterprise-grade solutions. I design and implement distributed systems, microservices, and API ecosystems using Java/J2EE, Spring, Kafka, and cloud-native technologies. I thrive in fast-paced Agile environments, mentor engineers, and drive architecture decisions that improve reliability, security, and performance. My focus areas include domain-driven design, observability, DevOps, and secure, scalable software delivery.…I am a Java Full Stack Developer with 11+ years of experience delivering scalable web applications and enterprise-grade solutions. I design and implement distributed systems, microservices, and API ecosystems using Java/J2EE, Spring, Kafka, and cloud-native technologies. I thrive in fast-paced Agile environments, mentor engineers, and drive architecture decisions that improve reliability, security, and performance. My focus areas include domain-driven design, observability, DevOps, and secure, scalable software delivery.

Available to hire

I am a Java Full Stack Developer with 11+ years of experience delivering scalable web applications and enterprise-grade solutions. I design and implement distributed systems, microservices, and API ecosystems using Java/J2EE, Spring, Kafka, and cloud-native technologies.

I thrive in fast-paced Agile environments, mentor engineers, and drive architecture decisions that improve reliability, security, and performance. My focus areas include domain-driven design, observability, DevOps, and secure, scalable software delivery.

Skills

Experience Level

Expert

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Language

English

Fluent

Work Experience

Software Engineer at Idexx Laboratories, USA

February 1, 2024 - October 30, 2025

Led frontend development with React.js, Angular, Redux, and Material UI; improved customer satisfaction and Core Web Vitals. Designed Java 17 + Spring Boot microservices to handle 5M+ daily transactions. Enhanced fraud detection with Kafka partitioning; built PCI-DSS compliant Rails services. Automated deployments with Terraform, Jenkins, and GitHub Actions; introduced blue/green releases. Improved SLA compliance via ECS, Kubernetes, and Lambda orchestration. Migrated 200+ endpoints to AWS API Gateway with OAuth2 + JWT. Reduced AWS spend by 18% through right-sizing and spot instances. Built Prometheus/Grafana dashboards for 99.99% uptime; achieved 95%+ test coverage. Mentored 4 junior engineers on microservices practices.

Software Engineer at Optum Insurance, Minneapolis, MN

February 1, 2024 - February 1, 2024

Developed user interfaces with React.js, Angular, and Rails; designed backend microservices in Java 17, Ruby on Rails, and Kafka. Integrated RabbitMQ and ActiveMQ for high-throughput messaging. Built APIs secured with OAuth2, JWT, and mTLS. Improved processing efficiency 40% with AWS EKS and Lambda. Automated IaC with Terraform and AWS CDK, reducing provisioning time 50%. Designed resilient microservices with canary releases, lowering production failures by 25%. Enhanced PostgreSQL, MySQL, and Oracle queries; automated tests with JUnit, Karate, Cypress; monitored with Grafana + Prometheus for 99.9% uptime. Migrated 200+ endpoints to API Gateway with OAuth2, improving scalability. Improved claims system disaster recovery with AWS multi-region failover.

Full Stack Developer at Aetna, Dallas, TX

August 1, 2022 - August 1, 2022

Developed enterprise web apps with Java, Spring Boot, React.js, and Hibernate; automated CI/CD with Jenkins + Docker. Deployed AWS Lambda, S3, and EC2 via CloudFormation templates. Architected microservices with Spring Cloud for millions of insurance transactions. Built REST + SOAP APIs, ensuring PCI DSS compliance. Refactored backend services, reducing customer response time by 50%. Cut downtime 25% with proactive monitoring; increased test coverage with JUnit + ReadyAPI. Mentored junior devs, improving onboarding time by 20%. Enhanced security with Spring Security and JWT tokens. Supported claim workflows worth $10M+ annually.

Java Full Stack Developer at Verizon, NC

March 1, 2021 - March 1, 2021

Built Angular 8 apps with RxJS, improving responsiveness by 25%. Designed Spring Boot REST APIs; improved API response time by 20%. Applied DAO, MVC, DTO patterns; strengthened security with Spring Security and AOP-based logging. Automated AWS provisioning with CloudFormation; reduced setup time by 50%. Increased deployment efficiency by 40% via Jenkins automation. Refactored with MapStruct; reduced boilerplate by 30%. Developed reusable Angular components; cut frontend development time by 15%. Improved monitoring with Splunk; reduced MTTR by 20%. Reduced sprint blockers by 15% in SAFe; enhanced requirements traceability with UML artifacts; reduced defect density by 20%.

Java Full Stack Developer at TCS, Chennai, India

March 1, 2020 - March 1, 2020

Delivered multiple high-priority features on time; actively debugged and fixed critical CI/CD pipeline failures, reducing unstable build errors by 35%. Used modern Java 8 features (Streams, Lambdas) to refactor legacy code. Built scalable MVC-based applications; contributed to a 20% reduction in QA-reported defects. Achieved 85% test coverage with JUnit; authored documentation to reduce onboarding time by 15%. Proposed technology stack upgrades to enhance maintainability and scalability. Built Angular 8 + TypeScript UIs; optimized REST APIs with Spring + MySQL; configured Kafka clusters; automated deployments with Jenkins + Docker.

Junior Java Developer at Capgemini, Hyderabad, India

November 1, 2018 - November 1, 2018

Built Java enterprise apps with Struts, Servlets, and JSP; developed SOAP web services using CXF + WebLogic. Worked with IBM WebSphere and JMS for enterprise messaging. Fixed 50+ bugs; identified critical issues during maintenance, reducing overall errors by 30%. Implemented MVC-based features for scalability; participated in Agile and Waterfall delivery models. Enhanced application security with secure session management; designed API schemas (WSDL/XSD). Supported CRUD via JDBC; documented debugging practices; peer-reviewed code to reduce vulnerabilities.

Software Engineer at Optum Insurance

September 1, 2022 - February 1, 2024

Developed user interfaces with React.js, Angular, and Rails; improved render speed by 30%. Designed backend microservices in Java 17, Ruby on Rails, and Kafka; integrated RabbitMQ and ActiveMQ for high-throughput messaging. Built APIs secured with OAuth2, JWT, and mTLS; improved security. Enhanced processing efficiency 40% with AWS EKS and Lambda. Automated IaC with Terraform and AWS CDK, reducing provisioning time by 50%. Designed resilient microservices with canary releases; lowered production failures by 25%. Enhanced PostgreSQL, MySQL, and Oracle queries; cut response time by 30%. Automated tests with JUnit, Karate, Cypress; maintained 90%+ coverage. Monitored systems with Grafana + Prometheus for 99.9% uptime. Migrated 200+ endpoints to AWS API Gateway with OAuth2; improved scalability. Strengthened disaster recovery with multi-region failover.

Full Stack Developer at Aetna

March 1, 2021 - August 1, 2022

Developed enterprise web apps with Java, Spring Boot, React.js, and Hibernate; boosted performance by 40%. Automated CI/CD with Jenkins + Docker; reduced release cycles by 50%. Deployed AWS Lambda, S3, and EC2 via CloudFormation templates. Architected microservices with Spring Cloud for millions of insurance transactions. Built REST + SOAP APIs ensuring PCI DSS compliance. Refactored backend services; reduced customer response time by 50%. Cut downtime by 25% through proactive monitoring with Splunk and CloudWatch. Increased test coverage with JUnit + ReadyAPI. Mentored junior devs, reducing onboarding time by 20%. Enhanced security with Spring Security and JWT tokens. Participated in Agile delivery; supported claim workflows worth $10M+ annually.

Java Full Stack Developer at Verizon

July 1, 2020 - March 1, 2021

Built Angular 8 apps with RxJS; improved responsiveness by 25%. Designed Spring Boot REST APIs; cut API response times by 20%. Applied DAO, MVC, DTO patterns to improve reusability. Strengthened security with Spring Security and AOP-based logging. Automated AWS provisioning with CloudFormation; reduced setup time by 50%. Increased deployment efficiency with Jenkins. Refactored with MapStruct; cut boilerplate by 30%. Developed reusable Angular components; reduced frontend development time by 15%. Improved monitoring with Splunk; reduced MTTR by 20%. Contributed to Agile SAFe; reduced sprint blockers by 15%. Enhanced requirements traceability with UML artifacts. Reduced defect density by 20% through modular design.

Java Full Stack Developer at TCS

September 1, 2019 - March 1, 2020

Delivered multiple high-priority features on time; reduced turnaround by 20%. Debugged and fixed critical CI/CD pipeline failures; reduced unstable build errors by 35%. Applied Java 8 features (Streams, Lambdas) to modernize legacy codebases. Built scalable MVC-based apps; contributed to a 20% reduction in QA-reported defects. Achieved 85% test coverage with JUnit. Documented technical solutions; reduced onboarding time by 15%. Proposed and implemented technology stack upgrades to enhance maintainability and scalability. Built Angular 8 + TypeScript UIs; cut load time by 30%. Optimized REST APIs with Spring + MySQL; cut response time by 25%. Configured Kafka clusters; boosted throughput by 40%. Automated deployments with Jenkins + Docker; moved from monthly to weekly releases. Reduced vulnerabilities by 30% using SonarQube.

Junior Java Developer at Capgemini

November 1, 2016 - November 1, 2018

Built Java enterprise apps with Struts, Servlets, and JSP; developed SOAP web services using CXF. Worked with IBM WebSphere and JMS for enterprise messaging. Fixed 50+ bugs; reduced app errors by 30%. Designed features based on MVC pattern for scalability and maintainability. Participated in Agile and Waterfall delivery; enhanced security with secure session management. Designed API schemas (WSDL/XSD) for request/response validation. Supported CRUD operations with JDBC. Peer-reviewed code; reduced vulnerabilities; documented debugging practices for reuse.

Java Full Stack Developer at Idexx Laboratories

December 1, 2022 - Present

Designed and developed RESTful microservices using Java 17 and Spring Boot 3.x, with distributed data models in Apache Cassandra handling millions of transactions. Built scalable backend services using Nest.js and Next.js for SSR and SEO improvements. Applied Domain-Driven Design and Hexagonal Architecture to separate domain logic from infrastructure. Implemented GraphQL and gRPC for high-performance inter-service communication and API versioning for backward compatibility. Designed scalable event-driven architecture leveraging Kafka, Schema Registry, and Kafka Connect. Implemented observability with OpenTelemetry, Prometheus, and Grafana, and defined SLI/SLOs that improved production reliability by 30%. Implemented Terraform modules and Helm charts, and GitOps with ArgoCD for Kubernetes deployments. Enforced secure access with OAuth2/JWT and Zero Trust principles; integrated OpenSearch for logging and search; applied Pact for contract testing. Mentored 5+ engineers and led architectur

Sr Java Full Stack Developer at Optum Insurance

November 1, 2020 - December 1, 2022

Implemented real-time streaming pipelines using Kafka and Oracle GoldenGate for reliable data replication. Built microservices with Spring Boot and modern front-end components using React/Next.js. Integrated secure authentication with OAuth2/JWT and Spring Security. Established CI/CD practices with Azure DevOps; deployed on Kubernetes (AKS) and leveraged cloud-native services. Implemented null-safe data handling, distributed tracing, and observability, contributing to improved system reliability and faster delivery cycles.

Sr Java Full Stack Developer at Aetna

February 1, 2018 - October 1, 2020

Designed microservices using Spring Boot and REST, and implemented real-time event processing with Apache Kafka. Integrated Pinecone vector DB for semantic search capabilities and built front-end components with React.js and Node.js. Implemented cross-browser UI considerations, CI/CD pipelines with Jenkins, and cloud deployments via PCF/AWS. Strengthened security with Spring Security, OAuth2/JWT, and data persistence with Hibernate and MongoDB/Mongo Template.

Sr Java Developer at Verizon

May 1, 2013 - July 1, 2016

Developed UI and backend components using Spring MVC and AngularJS as part of a SOA ecosystem. Deployed microservices on Pivotal Cloud Foundry and integrated .NET-based services for cross-platform interoperability. Built SPA interfaces, implemented JMS messaging with ActiveMQ, and established CI/CD pipelines with Jenkins. Worked on REST/SOAP services, implemented scheduling with Quartz, and managed deployments to PCF with a focus on secure access and scalable architecture.