Senior Java Developer ( SAMBA)

About the Position

We are seeking a Senior Java Developer (SAMBA) to join our team at PAYBACK in Warszawa, Masovian Voivodeship, PL. This role is pivotal for Germany’s largest loyalty program, focusing on cloud-based applications and enterprise solutions.

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, maintainable solutions.
• Work within a complex enterprise monolith 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 production.
• 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

• Competitive salary
• Opportunity to work in a leading fintech company
• Professional growth and development opportunities

About the Company

PAYBACK is a leading company in the loyalty and rewards industry, dedicated to enhancing customer engagement and satisfaction through innovative loyalty programs.