Senior Java Developer — Kafka & Microservices

Sii Poland; Województwo pomorskie; On-site; PLN 210,000 - 270,000; Full time

Benefits offered by this job

Great Place to Work

Centre of internal trainings

Profit sharing

MySii app

Medical care

Job summary

Sii Poland is hiring a Senior Java Developer to join a team building a modern enterprise data integration and processing platform that supports global logistics and transportation processes. You will develop scalable backend services, microservices, and event-driven integrations using Java and Spring Boot.

The role focuses on modernizing legacy applications, participating in architecture discussions, and making sound technical decisions.

Qualifications

• Minimum 10 years of commercial software development experience with strong Java backend expertise.
• Strong hands-on production experience with Apache Kafka.
• Proven experience designing and building microservices, scalable backend services, and event-driven architectures.
• Experience 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 collaboration in an international environment.
• Residence in Poland.
• CCDAK certification (Confluent Certified Developer for Apache Kafka).

Responsibilities

• Design, develop, and maintain scalable backend services and microservices using Java and Spring Boot.
• Implement event-driven architectures and data-processing solutions based on Apache Kafka.
• Build enterprise integrations between internal and external systems using APIs and messaging platforms.
• Participate in technical design and solution architecture discussions.
• Support modernization of legacy applications into scalable, cloud-ready solutions.
• Monitor, troubleshoot, and optimize performance across distributed environments.
• Collaborate with developers, architects, and stakeholders on data integration initiatives.

Skills

Java backend development

Apache Kafka

Microservices design

Distributed systems

English communication

Tools

Apache Kafka

Kafka Streams

Kafka Connect

Spring Boot

Docker/Kubernetes/OpenShift

Job description

Sii Poland is hiring a Senior Java Developer to join a team building a modern enterprise data integration and processing platform that supports global logistics and transportation processes. You will develop scalable backend services, microservices, and event-driven integrations using Java and Spring Boot.

The role focuses on modernizing legacy applications, participating in architecture discussions, and making sound technical decisions.