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Senior Java Developer with Apache Kafka (f/m/x)
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Offer summary

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

The project focuses on global-scale data integration and processing supporting key logistics and transportation processes. Proficiency in Java, Spring Boot, and Apache Kafka is required, emphasizing microservices and event-driven architecture. Responsibilities include backend design, legacy modernization, developing DDD-aligned solutions, and supporting system integrations. Active involvement in system architecture and application performance optimization is essential.

new

Senior Java Developer with Apache Kafka (f/m/x)

Company: Sii Sp. z o.o.

from: 12 August 2026
to: 11 September 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:senior
working mode:remote • hybrid • full office
Bydgoszcz, Kuyavia-Pomerania
Bydgoszcz, Kuyavia-Pomeraniaplac Kościeleckich 3View on map

Requirements

Expected technologies

Java
Apache Kafka
Kubernetes
MongoDB
Spring Boot
PostgreSQL

Optional technologies

Docker
AzureDevOps
Kafka

Our requirements

  • Minimum 10 years of commercial software development experience, including strong senior-level expertise in Java backend development
  • Strong hands-on production experience with Apache Kafka
  • Proven experience designing and building microservices, scalable backend services, and event-driven architectures
  • Practical experience working with distributed systems, enterprise integrations, and data processing solutions
  • Ability to contribute independently to technical design and solution architecture discussions.
  • Very good English communication skills, enabling effective collaboration in an international environment
  • Residence in Poland
  • Valid Confluent Certified Developer for Apache Kafka (CCDAK) certification

Optional

  • Production experience with Kafka Streams and Kafka Connect
  • Experience with cloud-native and containerized environments, including Azure, Kubernetes, OpenShift, Docker, or Podman

Your responsibilities

  • Designing, developing, and maintaining scalable backend services and microservices using Java and Spring Boot
  • Implementing event-driven architectures and data-processing solutions based on Apache Kafka
  • Building enterprise integrations between internal and external systems using APIs, messaging platforms, and asynchronous communication mechanisms
  • Participating in technical design and solution architecture discussions, providing expertise in distributed systems and integration patterns
  • Supporting the modernization and transformation of legacy applications into scalable, maintainable, and cloud-ready solutions
  • Monitoring, troubleshooting, and optimizing application performance, reliability, and scalability across distributed environments
  • Collaborating closely with developers, architects, and business stakeholders to deliver strategic data integration and digital transformation initiatives
Company

About the project

We are looking for an experienced Senior Java Developer to join a team building a modern enterprise data integration and processing platform that supports key logistics and transportation processes on a global scale. This role focuses on developing scalable backend services, microservices, and event-driven integrations within a complex enterprise environment.
You will contribute to the design and implementation of solutions that enable efficient data processing and communication across business systems. An important part of the role involves modernizing legacy applications and delivering solutions aligned with Domain-Driven Design principles.
We are looking for a self-driven professional who can actively participate in architecture discussions and make sound technical decisions. Strong hands-on production experience with Apache Kafka is essential for success in this role.

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 with Apache Kafka (f/m/x)
I apply to:
Sii Sp. z o.o.
Bydgoszcz, Kuyavia-Pomerania
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