Senior Java Developer - AI-Driven Legacy Modernization

Xebia Group; Polska; Hybrid; PLN 180,000 - 280,000; Full time

Job summary

Xebia Group is seeking a seasoned Java specialist to maintain and evolve a mature enterprise application, navigating a large legacy codebase and applying established architectural patterns. You will enhance stability, introduce meaningful refactors, and deliver new features in a Scrum-like environment.

The role emphasizes ownership, collaboration, and using AI-powered assistants to boost productivity while keeping quality high and engineering standards rigorous.

Qualifications

• Proven experience with large or legacy codebases.
• Ability to quickly understand complex existing systems and navigate architectures.
• Experience using AI-powered assistants to improve productivity and quality.
• Strong analytical and problem-solving skills with a pragmatic mindset.
• Willingness to own technical challenges and improve mature applications.

Responsibilities

• Developing and maintaining a mature Java application based on established architectural patterns.
• Working with a large and complex legacy codebase and gradually improving its structure and maintainability.
• Analyzing existing solutions, identifying areas for improvement, and introducing changes where they bring value.
• Developing new features while ensuring stability and reliability of existing functionality.
• Troubleshooting and resolving issues across different parts of the application.
• Contributing to code reviews, testing, and maintaining high engineering standards.
• Collaborating with other developers in a Scrum-like environment.
• Actively contributing to the technical evolution of the application and helping move the legacy forward.

Skills

Legacy codebase mastery

System understanding

AI tooling usage

Analytical problem solving

Ownership mentality

Team collaboration

English proficiency (B2+)

Tools

Claude Code

GitHub Copilot

Cursor AI

Job description

Xebia Group is seeking a seasoned Java specialist to maintain and evolve a mature enterprise application, navigating a large legacy codebase and applying established architectural patterns. You will enhance stability, introduce meaningful refactors, and deliver new features in a Scrum-like environment.

The role emphasizes ownership, collaboration, and using AI-powered assistants to boost productivity while keeping quality high and engineering standards rigorous.