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I will migrate and modernize your legacy java application
Attila B.
About this gig
Running an old Java or Spring application that has become risky to maintain or hard to extend? I migrate and modernize legacy Java systems to current, supportable versions without breaking what already works.
With 20 years of enterprise Java experience across fintech, retail, and media industries, I deliver:
- Codebase analysis and migration risk assessment
- Java version upgrades (8/11 to 17/21/25) and Spring Boot upgrades (to Spring Boot 3/4)
- Dependency modernization and removal of deprecated APIs
- Containerization (Docker, Kubernetes) for legacy monoliths
- Regression-safe refactoring backed by automated tests
Every engagement starts with a structured technical analysis of the existing codebase and a migration plan, so you know the risks and steps before any code changes begin.
I have built core banking integration platforms on Kubernetes, AI-powered document processing systems, and production CI/CD pipelines for enterprise clients.
Let us modernize your application together.
Get to know Attila B.
Attila B.
Senior Java and AWS Architect, Spring Boot, AI Integration
- FromHungary
- Member sinceJul 2026
Languages
Hungarian, English
Senior Java and AWS architect with 20 years of experience across fintech, retail, and media. I specialize in Java and Spring Boot microservices, Kubernetes deployment, and legacy system modernization. I also integrate AI and LLM capabilities into production backends, including RAG pipelines, vector search, and embedding generation. Recent work includes core banking platforms on Kubernetes, AI powered document search using transformer models, and CI/CD pipeline design. Every engagement starts with a structured technical analysis before writing code.
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FAQ
Will the migration break existing functionality?
The process is regression-safe. I add or rely on tests to verify behavior before and after each change.
Do you need full codebase access before starting?
For the Basic package, a representative sample is enough. Standard and Premium require repository access.
Can you migrate in stages instead of all at once?
Yes, module-by-module migration is the recommended approach for larger systems and is what the Standard package covers.
