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

Sii Poland; Piła; 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 delivering a large-scale Java application for a major loyalty program. You will analyze requirements, design robust solutions, and collaborate with business stakeholders and product teams across the enterprise.

Go hands-on with Java, Spring Boot, and cloud technologies, own features end-to-end, and help establish best practices. The role includes monthly travel to Warsaw and requires fluency in Polish and English.

Qualifications

• 8+ years of professional Java backend development in large-scale enterprise applications.
• Solid knowledge of Java, Spring/Spring Boot, object-oriented design principles, and clean code practices.
• Experience 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

Spring Boot

OO design

Unit testing

English

Polish

Communication

Tools

AWS

CI/CD

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