Senior Java Developer with Apache Kafka

About the Position

We are looking for an experienced Senior Java Developer with expertise in Apache Kafka to join our team in Poland. This role focuses on developing scalable backend services and event-driven integrations within a complex enterprise environment.

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.

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.

Nice to Have

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

Job Details

• Title: Senior Java Developer with Apache Kafka
• Location: Białystok, Poland (Remote and Office options available)
• Salary: 6000-8000 PLN/hour
• Employment Type: CONTRACTOR

Technologies & Tools

Must Have:

• Java
• Apache Kafka
• Kubernetes
• MongoDB
• Spring Boot
• PostgreSQL

Nice to Have:

• Docker
• AzureDevOps
• Kafka Streams
• Kafka Connect

About the Company

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.

Benefits

• Great Place to Work
• Stable financial standing
• Contracts with major global brands
• Internal training center
• Many experts to learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship Program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Health insurance

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