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

Sii Poland; Katowice; On-site; PLN 180,000 - 280,000; Full time

Benefits offered by this job

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 sharing

Passion Sponsorship program

Regular integration events and trips

Comfortable and well-equipped offices

MySii app

Medical care

Job summary

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

The role requires hands-on ownership from analysis through deployment, participation in code reviews, and creating automated tests.

Qualifications

• 8+ years of professional Java backend experience in large-scale enterprise applications.
• Proficient in Java, Spring/Spring Boot, OO design, and clean code.
• Experience with AWS or other cloud providers.
• Understanding of architecture, performance, and maintainability.
• Experience with automated testing (unit & integration) and CI/CD.
• Excellent communication with stakeholders; fluent 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 solutions.
• Own features end-to-end from analysis through deployment and production support.
• Collaborate closely with business stakeholders, product teams, and other engineers.
• Communicate technical concepts clearly to both technical and non-technical audiences.
• Create and maintain automated tests to support continuous delivery.
• Document architectural decisions, design concepts, and implementation approaches.
• Participate in code reviews and contribute to engineering best practices.

Skills

Excellent communication

Polish language

English language

Collaboration with stakeholders

Tools

Java

Spring/Spring Boot

CI/CD pipelines

Unit testing

Integration testing

AWS

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