Andriy S.

Need a Java backend developer who can fix production problems, modernize a legacy system, and keep features shipping? I build and support Spring Boot APIs and microservices on AWS, from requirements through deployment and monitoring. With 15+ years in Java, I combine backend engineering with delivery and operations: CI/CD, containers, cloud, and monitoring, even when there is no dedicated DevOps engineer. I look past the symptom to find what failed and reduce the chance of it recurring. I can help with: ✅ Spring Boot REST APIs and microservices with automated tests ✅ Legacy Java modernization through incremental refactoring and upgrades ✅ Production support: incidents, data inconsistencies, recurring failures ✅ Integrations and messaging with RabbitMQ and AWS SQS, including retries and duplicate handling ✅ CI/CD, Docker, Kubernetes, Terraform and monitoring on AWS and Azure Top Rated Plus with a 5.0 rating, 9,500+ hours on Upwork. AWS Certified Solutions Architect – Associate, MongoDB Certified Developer, and Oracle Certified Professional – Java. Send me a short description of your project and the main problem you need solved, and I will reply with a clear plan and a realistic estimate. 🔑 Keywords: Java, Spring Boot, Backend Development, REST API, SOAP, Microservices, RabbitMQ, AWS SQS, MySQL, MongoDB, Spring Security, Keycloak, JUnit, Integration Testing, AWS, Azure, Docker, Kubernetes, Helm, Terraform, CI/CD, Bitbucket, GitLab CI, Monitoring, Production Support, Legacy Modernization, AI-Assisted Development.