Senior Java Developer - Loyalty sector (f/m/x)

Sii Poland; Warszawa; On-site; PLN 180,000 - 240,000; 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 seeking an experienced Senior Java Developer to join a team delivering a large-scale Java application for a major loyalty program. You will analyze business requirements and production issues to design robust solutions while collaborating closely with business stakeholders and product teams.

You will own features end-to-end—from analysis through implementation, testing, deployment, and production support—with a focus on maintainability in a complex enterprise environment.

Qualifications

• 8+ years of professional Java backend experience in large-scale enterprise apps.
• Strong knowledge of Java, Spring/Spring Boot, OO design and clean code.
• Experience with AWS or another major cloud provider.
• Understanding of architecture, performance, and maintainability.
• Experience with automated testing (unit & integration).
• Familiarity with CI/CD and modern delivery practices.
• Excellent communication and collaboration with stakeholders.
• Proficient in Polish and English.

Responsibilities

• Develop and maintain a large-scale Java application in the cloud.
• Analyze business requirements and production issues to design robust solutions.
• Own features end-to-end from analysis to deployment and support.
• Collaborate with business stakeholders, product teams, and engineers.
• Communicate technical concepts clearly to diverse audiences.
• Create and maintain automated tests to ensure quality.
• Document architectural decisions and implementation approaches.
• Participate in code reviews and promote engineering best practices.

Skills

Java backend

Spring/Spring Boot

AWS

Cloud architecture

CI/CD pipelines

Unit & integration tests

Polish & English

Communication

Job description

We are looking for an experienced Senior Java Developer to join a team working on a large-scale Java application for one of the largest loyalty program. In this role, you will analyze business requirements and production issues to design robust solutions while collaborating closely with business stakeholders and product teams. If you are passionate about developing maintainable solutions in a complex enterprise environment, this opportunity may be the right fit for you.

This role involves business trips to Warsaw once a month.

Job no. JOB-96GYT

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Your tasks

• 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

Requirements

• 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

Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharingPassion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care