ozkan o.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I help teams build, integrate and modernize enterprise Java applications. I am a Senior / Lead Software Engineer with 10+ years of experience in Java, Spring Boot, microservices and full-stack delivery, including remote B2B work with IBM and international clients. What I can help you with: - Java / Spring Boot backend development, REST APIs and enterprise integrations - Legacy Java modernization, refactoring and migration to maintainable services - Microservices and event-driven systems with Spring Cloud and Kafka - Production troubleshooting, performance optimization, testing and code reviews - Containerized delivery with Docker, Kubernetes, OpenShift and Jenkins CI/CD - Full-stack business applications using React, Vue.js and SQL databases At IBM, I work on business-critical Quote-to-Cash applications, covering technical analysis, solution design, development, modernization and production support. My experience includes technical leadership across development teams, mentoring engineers and implementing integration layers across interconnected systems. Previously, I delivered a Java/Spring Boot and React ERP application for a German client, developed Java backend services for a mobile MMO with AWS DynamoDB, and built and modernized government applications and data-sharing systems. Core stack: Java 8/11/17/21, Spring Boot, Spring Cloud, Spring Batch, REST APIs, Kafka, SQL, PostgreSQL, MySQL, DB2, DynamoDB, Docker, Kubernetes, OpenShift, Jenkins, Git, Maven, Gradle and JUnit. I start by understanding your business requirements and existing systems, then take ownership from solution design through implementation and production support. I also use AI-assisted engineering and MCP workflows to support analysis, development and troubleshooting. If you need an experienced engineer to extend a backend, resolve production issues or modernize a Java application, let's discuss your project.