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Raj Kumar Sony

@rajkumar-sony

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Java backend engineer building scalable microservices and secure REST APIs on AWS for B2B SaaS.

Japan

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What I'm looking for

I’m looking for a backend-focused role where I can build and harden secure Java/Spring microservices on AWS, own production troubleshooting, and improve delivery with CI/CD, while collaborating in Agile/Scrum to deliver scalable SaaS outcomes.

I’m a Java Backend Engineer with 4.3 years of experience designing, developing, testing, deploying, and supporting scalable backend applications. I build secure, production-ready services using Java 11/17, Spring Boot, microservices, REST APIs, and Spring Security, with AWS as my primary cloud.

At PLAN-B, I lead end-to-end SDLC and drive improvements like 40% better scalability, 60% lower API latency, and 35% reduced server infrastructure costs after migrating legacy PHP to Spring Boot microservices. I also troubleshoot production issues with logs and AWS CloudWatch, reducing API latency by 60%, and automate CI/CD with Jenkins, Maven, Docker, and Kubernetes—cutting release cycle time by 50% and MTTR by 40%.

Previously, as a Programmer Analyst / Java Full Stack Engineer at Cognizant, I improved a Healthcare IT Tracking System’s end-user experience by 30% using application optimization. I also contributed full SDLC work and optimized AWS and MySQL performance, improving resource utilization by 40% and reducing data retrieval time by 35%.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer – Java Backend / SaaS

Current

PLAN-B, Inc.

Feb 2023 - Present (3 years 6 months)

Designed, developed, deployed, and maintained scalable B2B SaaS backend services using Java, Spring Boot, microservices, and AWS, improving scalability by 40% and leading the end-to-end SDLC. Troubleshot production issues with root-cause analysis (reducing API latency by 60%), migrated legacy PHP to Spring Boot microservices, and automated CI/CD with Jenkins/Maven/Docker/Kubernetes (reducing relea

Java Spring Boot Microservices REST APIs Hibernate SQL PostgreSQL AWS Jenkins Maven Docker Kubernetes Cloudwatch CI CD SDLC Root Cause Analysis Technical Documentation

Programmer Analyst – Java Full Stack

Cognizant Technology Solutions

Mar 2022 - Sep 2022 (6 months)

Developed and enhanced a Healthcare IT Tracking System using Java, Core Java, Spring Boot, Angular, and MySQL, improving end-user experience by 30% through application optimization. Contributed across the SDLC, participated in peer code reviews, and improved AWS resource utilization by 40% while reducing data retrieval time by 35% via MySQL query optimization and indexing.