Senior Java Backend Engineer - Cloud & End-to-End

Sii Poland; Poznań; On-site; PLN 220,000 - 340,000; Full time

Benefits offered by this job

Great Place to Work

Centre of internal trainings

Profit sharing

Regular integration events and trips

Medical care

Job summary

Sii Poland is looking for an experienced Senior Java Developer to join a team working on a large-scale Java application for a major loyalty program. You will analyze requirements and production issues to design robust, maintainable solutions while collaborating with stakeholders and product teams.

Monthly business trips to Warsaw are possible. Join a dynamic enterprise environment where you’ll own features end-to-end, participate in code reviews, and create automated tests to ensure continuous

Qualifications

• Minimum 8 years of professional experience in Java backend software development in large-scale enterprise applications and complex codebases.
• Solid knowledge of Java, Spring/Spring Boot, object-oriented design principles, and clean code practices.
• Experience working with AWS 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.
• Advanced level of Polish and English.

Responsibilities

• Develop and maintain a large-scale Java application running in the cloud.
• Analyze business requirements and production issues to design robust, maintainable solutions.
• 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.

Skills

Java backend

Spring/Spring Boot

OO design

Clean code

Automated testing

CI/CD

Polish language

English language

Communication skills

AWS

Tools

AWS

Job description

Sii Poland is looking for an experienced Senior Java Developer to join a team working on a large-scale Java application for a major loyalty program. You will analyze requirements and production issues to design robust, maintainable solutions while collaborating with stakeholders and product teams.

Monthly business trips to Warsaw are possible. Join a dynamic enterprise environment where you’ll own features end-to-end, participate in code reviews, and create automated tests to ensure continuous