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

(Summary generated by AI based on the full job description)

Project concerns a large-scale loyalty program application. Technologies used are Java, Spring/Spring Boot and work with AWS. Main responsibilities include analyzing requirements and production issues, designing solutions, developing and maintaining the cloud application and owning features end-to-end, including automated tests, CI/CD and production support. Required minimum 8 years of backend experience, strong application architecture and performance optimization skills, fluent Polish and English.

new

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

Company: Sii Sp. z o.o.

from: 15 September 2026
to: 15 October 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:senior
working mode:remote • hybrid • full office
Białystok, Centrum
Białystok, CentrumJózefa Marjańskiego 3View on map

Requirements

Expected technologies

Java
Spring Boot
PostgreSQL
Docker

Optional technologies

AWS
Microsoft Azure

Our 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

Your 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
Company

About the project

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.

What we offer

  • Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
  • Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
  • We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
  • Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
  • Comfortable workplace – class A offices or remote work
  • Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
  • PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
  • Investment in your growth – meetups, webinars, training platform and technology blog – you choose
  • Fantastic atmosphere created by all Sii Power People

Recruitment stages

  • 1.
    Send your CV
  • 2.
    Talk to us about your expectations
  • 3.
    Learn more about our projects and choose the best
  • 4.
    Start your adventure with Sii!

Sii Sp. z o.o.

Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.
Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.

This is how we work

Senior Java Developer - Loyalty sector (f/m/x)
I apply to:
Sii Sp. z o.o.
Białystok, Centrum
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