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I am Rajkumar Jayakumar, a results-driven Full Stack Java Lead with over 12 years of experience designing and delivering scalable, secure enterprise applications. I specialize in Java, Spring Boot, microservices, and modern front-end frameworks like ReactJS and Angular, with hands-on expertise in cloud-native platforms such as AWS, Kubernetes, and Docker. I excel at modernizing legacy systems, driving performance improvements, and leading agile teams to translate business needs into high-quality, scalable solutions. I am passionate about architecture, mentoring, and ensuring quality through automated CI/CD and robust testing while keeping security and reliability at the forefront.…I am Rajkumar Jayakumar, a results-driven Full Stack Java Lead with over 12 years of experience designing and delivering scalable, secure enterprise applications. I specialize in Java, Spring Boot, microservices, and modern front-end frameworks like ReactJS and Angular, with hands-on expertise in cloud-native platforms such as AWS, Kubernetes, and Docker. I excel at modernizing legacy systems, driving performance improvements, and leading agile teams to translate business needs into high-quality, scalable solutions. I am passionate about architecture, mentoring, and ensuring quality through automated CI/CD and robust testing while keeping security and reliability at the forefront.

Rajkumar Jayakumar

Full Stack Developer, Web Developer, Back-End Developer, +2

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I am Rajkumar Jayakumar, a results-driven Full Stack Java Lead with over 12 years of experience designing and delivering scalable, secure enterprise applications. I specialize in Java, Spring Boot, microservices, and modern front-end frameworks like ReactJS and Angular, with hands-on expertise in cloud-native platforms such as AWS, Kubernetes, and Docker. I excel at modernizing legacy systems, driving performance improvements, and leading agile teams to translate business needs into high-quality, scalable solutions. I am passionate about architecture, mentoring, and ensuring quality through automated CI/CD and robust testing while keeping security and reliability at the forefront.…I am Rajkumar Jayakumar, a results-driven Full Stack Java Lead with over 12 years of experience designing and delivering scalable, secure enterprise applications. I specialize in Java, Spring Boot, microservices, and modern front-end frameworks like ReactJS and Angular, with hands-on expertise in cloud-native platforms such as AWS, Kubernetes, and Docker. I excel at modernizing legacy systems, driving performance improvements, and leading agile teams to translate business needs into high-quality, scalable solutions. I am passionate about architecture, mentoring, and ensuring quality through automated CI/CD and robust testing while keeping security and reliability at the forefront.

Available to hire

I am Rajkumar Jayakumar, a results-driven Full Stack Java Lead with over 12 years of experience designing and delivering scalable, secure enterprise applications. I specialize in Java, Spring Boot, microservices, and modern front-end frameworks like ReactJS and Angular, with hands-on expertise in cloud-native platforms such as AWS, Kubernetes, and Docker.

I excel at modernizing legacy systems, driving performance improvements, and leading agile teams to translate business needs into high-quality, scalable solutions. I am passionate about architecture, mentoring, and ensuring quality through automated CI/CD and robust testing while keeping security and reliability at the forefront.

Skills

Experience Level

Expert

Expert

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Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Work Experience

Senior Software Developer at Oracle Global Services Singapore Pte. Ltd.

October 1, 2025 - October 1, 2025

Engineered full-stack applications using Java (Spring Boot) and React/Angular in an enterprise microservices environment. Led design and development of cloud-native microservices on AWS/Kubernetes, established robust CI/CD pipelines with Jenkins, Docker, and Kubernetes, and optimized PL/SQL queries to reduce latency and improve throughput. Provided production support for Opera V5/V9 Cloud environments and collaborated in Agile ceremonies to maintain timelines.

System Analyst at Central Provident Fund (CPF) Singapore

August 30, 2024 - August 30, 2024

Delivered highly available CPF system features using Spring Boot, Hibernate/JPA, and a microservices architecture deployed on AWS/Docker/Kubernetes. Enhanced UI with ReactJS and AngularJS, maintained CI/CD pipelines (Jenkins) ensuring code quality via SonarQube, refactored legacy Mainframe/DB2 components into modern microservices, and optimized SQL/DB2 queries to improve withdrawal processing performance by ~20%. Collaborated closely with business analysts and testers in Agile sprints.

Analyst Programmer at Urban Redevelopment Authority (URA)

August 31, 2022 - August 31, 2022

Developed and maintained the License Management System using a full-stack Java approach (Spring MVC, Hibernate, Struts) and REST APIs. Initiated modularization of monolithic components to pave the way for microservices migration, secured data integrity, and optimized backend SQL/JAVA logic. Designed JSP-based UI with reusable components and participated in Agile ceremonies.

Java Programmer at Housing & Development Board (HDB)

August 31, 2020 - August 31, 2020

Built a high-volume Event Management application using traditional Java EE stack (EJB, JSF/PrimeFaces, JSP) with REST exposure. Optimized DB2 queries reducing critical transaction response times by 75%, created reusable front-end components, and supported deployment on IBM WebSphere.

Analyst System Dev. at Verizon Data Services India Pvt. Ltd

August 2, 2019 - August 2, 2019

Engineered high-throughput REST APIs and microservices using Spring Boot with Cassandra (CQL), managed via Ansible. Reduced deployment time by 50% through end-to-end CI/CD pipelines with Jenkins and Maven, maintained code quality with JUnit, and led migration from monolith to scalable microservices in a global team.

Senior Software Engineer at Tech Mahindra Pte. Ltd

April 7, 2017 - April 7, 2017

Developed and integrated external APIs for the Seat Upgrade System (British Airways) using Java 7, Spring, REST. Implemented robust unit tests (JUnit/PowerMockito) and created REST web services for seat upgrade functionality in an Agile environment.

Engineer Technology at Virtusa Software Services Pvt. Ltd

December 16, 2016 - December 16, 2016

Enhanced Analytics Engine methodologies, created and consumed RESTful services using Java, Spring, and Hibernate. Drove core migration from monolith to microservices and contributed to global agile teams.