Senior Java Developer

IT & Product Development

Warsaw

Full Time

About the Position

We are seeking a Senior Java Developer with 7+ years of professional experience to join our team in Warsaw. You will be working on Germany’s largest loyalty program, developing and maintaining a large-scale Java application running in the cloud.

Responsibilities

• Develop and maintain a large-scale Java application running in the cloud for Germany’s largest loyalty program.
• Analyze business requirements and production issues to design robust and maintainable solutions.
• Work within a complex enterprise monolithic application and contribute to its continuous evolution.
• Own features end-to-end, from requirements analysis through implementation, testing, deployment, and production support.
• Collaborate closely with business stakeholders, product teams, and other engineers.
• Communicate technical concepts and solution proposals clearly to both technical and non-technical audiences.
• Create and maintain automated tests to ensure software quality and support continuous delivery.
• Document architectural decisions, design concepts, and implementation approaches.
• Participate in code reviews and contribute to engineering best practices.

Requirements

• 7+ years of professional experience in backend software development.
• At least 5 years of hands-on experience with Java in large-scale enterprise applications and complex codebases.
• Strong experience maintaining and evolving large monolithic systems in a production environment.
• Solid knowledge of Java, Spring/Spring Boot, object-oriented design principles, and clean code practices.
• Experience working with AWS Cloud or another major cloud provider.
• Strong understanding of application architecture, performance optimization, and maintainability.
• Experience with automated testing, including unit and integration tests.
• Familiarity with CI/CD pipelines and modern software delivery practices.
• Excellent communication skills and ability to collaborate with technical and business stakeholders.
• Fluent English (B2+) spoken and written.
• Ownership mindset with a strong focus on delivering business value.
• Ability to navigate complex legacy and modern codebases and drive improvements pragmatically.
• Experience working in Agile development teams.

Nice to Have

• Experience with large enterprise monoliths undergoing modernization.
• Knowledge of relational databases and SQL performance tuning.
• Experience with Docker and cloud-native deployment practices.
• Experience mentoring developers and supporting technical growth within the team.

We Offer

• Employment contract with stable employment.
• Corporate incentive program, sport card, private medical care.
• Lunch card with additional funds for meal purchases.
• Hybrid working model with 2 days a week from home.
• Opportunity to work remotely from European countries for up to 15 days a year.
• Flexible working hours starting between 7 to 10.
• Trainings to develop hard and soft skills.
• Convenient location at Rondo Daszyńskiego with remote work options.
• No rigid dress code, sneakers are welcome.
• Friendly atmosphere where people are the most important asset.
• Open communication is our priority.

About the Company

At PAYBACK, we value our employees and provide a supportive and dynamic work environment. We believe in the power of our people and strive to create a workplace where everyone can thrive.

Don't wait! Send your CV and join our team today.