Senior Java Engineer - Modernize Legacy Apps with AI

Poland and Central-Eastern Europe; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

Xebia, a global AI-first transformation partner, is seeking a senior Java developer to join a EU-based team. You’ll work on a mature Java application, evolve the legacy codebase, and add new features while ensuring stability and quality in a Scrum-like environment.

You’ll analyze existing solutions, identify improvements, and collaborate with teammates to move the legacy forward. Strong problem-solving, clear communication, and fluent English (B2) are required, along with EU work eligibility.

Qualifications

• Senior-level experience in Java development.
• Experience with large or legacy codebases.
• Ability to quickly understand complex existing systems and navigate established architectural patterns.
• Practical experience using AI-powered assistants to improve productivity, quality, or decision-making in software delivery.
• Strong analytical and problem-solving skills with a pragmatic approach to improving existing solutions.
• Confidence in introducing changes to mature applications and taking ownership of technical challenges.
• Willingness to work with legacy technology and improve it rather than simply maintain the existing state.
• Good communication and collaboration skills and the ability to work effectively in a team.
• Good command of English (min. B2).
• Work from the European Union region and a work permit are required.

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.
• Analysing existing solutions, identifying areas for improvement, and introducing changes where they bring value.
• Developing new features while ensuring the 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 solution forward.

Skills

Java development

Legacy codebase

English (B2)

Architectural patterns

AI-assisted development

Tools

Claude Code

GitHub Copilot

Cursor

Job description

Xebia, a global AI-first transformation partner, is seeking a senior Java developer to join a EU-based team. You’ll work on a mature Java application, evolve the legacy codebase, and add new features while ensuring stability and quality in a Scrum-like environment.

You’ll analyze existing solutions, identify improvements, and collaborate with teammates to move the legacy forward. Strong problem-solving, clear communication, and fluent English (B2) are required, along with EU work eligibility.